Heterojunction Solar Cells A Si C Si

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Silicon Heterojunction Solar Cells

Author : W.R. Fahrner
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3038131024
Total Pages : 208 pages
Book Rating : 4.0/5 (381 download)

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Book Synopsis Silicon Heterojunction Solar Cells by : W.R. Fahrner

Download or read book Silicon Heterojunction Solar Cells written by W.R. Fahrner and published by Trans Tech Publications Ltd. This book was released on 2006-08-15 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world of today must face up to two contradictory energy problems: on the one hand, there is the sharply growing consumer demand in countries such as China and India. On the other hand, natural resources are dwindling. Moreover, many of those countries which still possess substantial gas and oil supplies are politically unstable. As a result, renewable natural energy sources have received great attention. Among these, solar-cell technology is one of the most promising candidates. However, there still remains the problem of the manufacturing costs of such cells. Many attempts have been made to reduce the production costs of conventional solar cells (manufactured from monocrystalline silicon using diffusion methods) by instead using cheaper grades of silicon, and simpler pn-junction fabrication. That is the hero of this book; the heterojunction solar cell.

Heterojunction Solar Cells (a-Si/c-Si)

Author : Thomas Mueller
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 3832522913
Total Pages : 280 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Heterojunction Solar Cells (a-Si/c-Si) by : Thomas Mueller

Download or read book Heterojunction Solar Cells (a-Si/c-Si) written by Thomas Mueller and published by Logos Verlag Berlin GmbH. This book was released on 2009 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main focus of the present work is related to the optimization of heterojunction solar cells. The key roles in obtaining high efficient heterojunction solar cells are mainly the plasma enhanced chemical vapor deposition of very low defect layers, and the sufficient surface passivation of all interfaces. In heterojunction solar cells, the a-Si: H/c-Si hetero-interface is of significant importance, since the hetero-interface characteristics directly affect the junction properties and thus solar cell efficiency. In this work, the deposition and film properties of various hydrogenated amorphous silicon alloys, such as a-SiC: H, a-SiO_x: H, and muc-Si: H (standard a-Si: H is used as reference), are employed. Special attention is paid to (i) the front and back surface passivation of the bulk material by high-quality wide-gap amorphous silicon suboxides (a-SiO_x: H), and (ii) the influence of wide-gap high-quality a-Si- and muc-Si-based alloys for use as emitter and back-surface-

Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar Cells

Author : Wilfried G. J. H. M. van Sark
Publisher : Springer Science & Business Media
ISBN 13 : 3642222757
Total Pages : 588 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar Cells by : Wilfried G. J. H. M. van Sark

Download or read book Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar Cells written by Wilfried G. J. H. M. van Sark and published by Springer Science & Business Media. This book was released on 2011-11-16 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today’s solar cell multi-GW market is dominated by crystalline silicon (c-Si) wafer technology, however new cell concepts are entering the market. One very promising solar cell design to answer these needs is the silicon hetero-junction solar cell, of which the emitter and back surface field are basically produced by a low temperature growth of ultra-thin layers of amorphous silicon. In this design, amorphous silicon (a-Si:H) constitutes both „emitter“ and „base-contact/back surface field“ on both sides of a thin crystalline silicon wafer-base (c-Si) where the electrons and holes are photogenerated; at the same time, a-Si:H passivates the c-Si surface. Recently, cell efficiencies above 23% have been demonstrated for such solar cells. In this book, the editors present an overview of the state-of-the-art in physics and technology of amorphous-crystalline heterostructure silicon solar cells. The heterojunction concept is introduced, processes and resulting properties of the materials used in the cell and their heterointerfaces are discussed and characterization techniques and simulation tools are presented.

Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells

Author : Wolfgang Rainer Fahrner
Publisher : Springer Science & Business Media
ISBN 13 : 364237039X
Total Pages : 119 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells by : Wolfgang Rainer Fahrner

Download or read book Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells written by Wolfgang Rainer Fahrner and published by Springer Science & Business Media. This book was released on 2013-04-23 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amorphous Silicon/Crystalline Silicon Solar Cells deals with some typical properties of heterojunction solar cells, such as their history, the properties and the challenges of the cells, some important measurement tools, some simulation programs and a brief survey of the state of the art, aiming to provide an initial framework in this field and serve as a ready reference for all those interested in the subject. This book helps to “fill in the blanks” on heterojunction solar cells. Readers will receive a comprehensive overview of the principles, structures, processing techniques and the current developmental states of the devices. Prof. Dr. Wolfgang R. Fahrner is a professor at the University of Hagen, Germany and Nanchang University, China.

High-Efficiency Crystalline Silicon Solar Cells

Author : Eun-Chel Cho
Publisher : MDPI
ISBN 13 : 3039436295
Total Pages : 90 pages
Book Rating : 4.0/5 (394 download)

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Book Synopsis High-Efficiency Crystalline Silicon Solar Cells by : Eun-Chel Cho

Download or read book High-Efficiency Crystalline Silicon Solar Cells written by Eun-Chel Cho and published by MDPI. This book was released on 2021-01-06 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is composed of 6 papers. The first paper reports a novel technique for the selective emitter formation by controlling the surface morphology of Si wafers. Selective emitter (SE) technology has attracted renewed attention in the Si solar cell industry to achieve an improved conversion efficiency of passivated-emitter rear-contact (PERC) cells. In the second paper, the temperature dependence of the parameters was compared through the PERC of the industrial-scale solar cells. As a result of their analysis, PERC cells showed different temperature dependence for the fill factor loss as temperatures rose. The third paper reports the effects of carrier selective front contact layer and defect state of hydrogenated amorphous silicon passivation layer/n-type crystalline silicon interface. The results demonstrated the effects of band offset determined by band bending at the interface of the passivation layer and carrier selective front contact layer. In addition, the nc-SiOx: H CSFC layer not only reduces parasitic absorption loss but also has a tunneling effect and field-effect passivation. The fourth paper reports excimer laser annealing of hydrogenated amorphous silicon film for TOPCon solar cell application. This paper analyzes the crystallization of a-Si:H via excimer laser annealing (ELA) and compared this process with conventional thermal annealing. The fifth paper reports the contact mechanism between Ag–Al and Si and the change in contact resistance (Rc) by varying the firing profile. Rc was measured by varying the belt speed and peak temperature of the fast-firing furnace. The sixth paper reports a silicon tandem heterojunction solar cell based on a ZnO/Cu2O subcell and a c-Si bottom subcell using electro-optical numerical modeling. The buffer layer affinity and mobility together with a low conduction band offset for the heterojunction are discussed, as well as spectral properties of the device model.

Crystalline Silicon Heterojunction Solar Cells

Author : Denís Pascual Sánchez
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Crystalline Silicon Heterojunction Solar Cells by : Denís Pascual Sánchez

Download or read book Crystalline Silicon Heterojunction Solar Cells written by Denís Pascual Sánchez and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is a slight research on silicon heterojunction solar cells which have been of great interest recently. The aim is to span fabrication, characterization and simulation and to reach a broad but shallow knowledge about this devices. Within heterojunction solar cells, this work is particularly focused on amorphous silicon/crystalline silicon (a-Si/c-Si) heterojunction solar cells and Transition-Metal-Oxide (TMO) silicon heterojunction solar cells (TMO/c-Si). TMO started being of interest very recently because they can substitute a-Si in a solar cell lowering fabrication costs while achieving relatively good performance. Unlikely, it is not clear why it can play the same role as a-Si since they are very different materials. Therefore simulating TMO based devices is still far from being reliable. Simulations of a-Si heterojunction solar cells have been performed since it seems to be the starting point of the road to simulating TMO. The fabrication and characterization processes are almost the same for the two types of solar cell. Since the final aim is to understand TMO heterojunction solar cells, this part is dedicated to them. Three different TMOs heterojunction solar cells have been fabricated and characterized which are M oOx , W Ox and V2 O5 while the simulation has focused on a-Si. The work has been carried out collaborating with a research group from electronics department of the UPC (Universitat Politèctica de Cataunya). Silvaco ATLAS electronic device simulator has been used to reproduce the a-Si HIT (Heterojuntion with Intrinsic Thin layer) solar cell figures of merit.

Electroluminescence of a-Si c-Si heterojunction solar cells after high energy irradiation

Author : Manuela Ferrara
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (17 download)

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Book Synopsis Electroluminescence of a-Si c-Si heterojunction solar cells after high energy irradiation by : Manuela Ferrara

Download or read book Electroluminescence of a-Si c-Si heterojunction solar cells after high energy irradiation written by Manuela Ferrara and published by . This book was released on 2009 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar Cells

Author : Wilfried G. J. H. M. van Sark
Publisher : Springer
ISBN 13 : 9783642222764
Total Pages : 582 pages
Book Rating : 4.2/5 (227 download)

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Book Synopsis Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar Cells by : Wilfried G. J. H. M. van Sark

Download or read book Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar Cells written by Wilfried G. J. H. M. van Sark and published by Springer. This book was released on 2012-02-23 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today’s solar cell multi-GW market is dominated by crystalline silicon (c-Si) wafer technology, however new cell concepts are entering the market. One very promising solar cell design to answer these needs is the silicon hetero-junction solar cell, of which the emitter and back surface field are basically produced by a low temperature growth of ultra-thin layers of amorphous silicon. In this design, amorphous silicon (a-Si:H) constitutes both „emitter“ and „base-contact/back surface field“ on both sides of a thin crystalline silicon wafer-base (c-Si) where the electrons and holes are photogenerated; at the same time, a-Si:H passivates the c-Si surface. Recently, cell efficiencies above 23% have been demonstrated for such solar cells. In this book, the editors present an overview of the state-of-the-art in physics and technology of amorphous-crystalline heterostructure silicon solar cells. The heterojunction concept is introduced, processes and resulting properties of the materials used in the cell and their heterointerfaces are discussed and characterization techniques and simulation tools are presented.

Toward Better Understanding and Improved Performance of Silicon Heterojunction Solar Cells

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Toward Better Understanding and Improved Performance of Silicon Heterojunction Solar Cells by :

Download or read book Toward Better Understanding and Improved Performance of Silicon Heterojunction Solar Cells written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The double-sided silicon heterojunction (SHJ) solar cell is more appropriate for n-type crystal silicon (c-Si) wafers than for p-type c-Si wafers because there is a larger band offset to the valence band edge of hydrogenated amorphous silicon than to the conduction band edge. Thin intrinsic and doped hydrogenated amorphous silicon (a Si:H) double layers by hot-wire chemical vapor deposition (HWCVD) are investigated as passivation layers, emitters, and back-surface-field (BSF) contacts to both p- and n-type wafers. Passivation quality is studied by characterizing the SHJ solar cells and by photoconductive decay (PCD) minority-carrier lifetime measurements. The crystal-amorphous heterointerface is studied with real-time spectroscopic ellipsometry (RTSE) and high-resolution transmission electron microscopy (HRTEM) to detect phase change and material evolution, with a focus on better understanding the factors determining passivation effectiveness. A common feature in effective passivation, emitter, and BSF layers is immediate a-Si:H deposition and an abrupt and flat interface to the c-Si substrate. In this case, good wafer passivation or an excellent heterojunction is obtained, with a low interface recombination velocity (S) or a high open-circuit voltage (Voc). Voc greater than 640 mV, S less than 15 cm/sec, and efficiency of 14.8% have been achieved on polished p type Czochralski-grown (CZ) Si wafers. Collaboration between NREL and Georgia Tech resulted in a 15.7%-efficient HWCVD-deposited SHJ cell on non-textured FZ-Si with a screen-printed Al back surface field (BSF), the highest reported HWCVD SHJ cell. Collaboration between NREL and SunPower demonstrated that HWCVD a-Si:H passivation can be better than the conventional oxides, with a low surface recombination velocity of 42 cm/sec on textured n-type FZ-Si.

Fundamentals of Solar Cell Design

Author : Inamuddin
Publisher : John Wiley & Sons
ISBN 13 : 1119724708
Total Pages : 578 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Fundamentals of Solar Cell Design by : Inamuddin

Download or read book Fundamentals of Solar Cell Design written by Inamuddin and published by John Wiley & Sons. This book was released on 2021-08-24 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells are semiconductor devices that convert light photons into electricity in photovoltaic energy conversion and can help to overcome the global energy crisis. Solar cells have many applications including remote area power systems, earth-orbiting satellites, wristwatches, water pumping, photodetectors and remote radiotelephones. Solar cell technology is economically feasible for commercial-scale power generation. While commercial solar cells exhibit good performance and stability, still researchers are looking at many ways to improve the performance and cost of solar cells via modulating the fundamental properties of semiconductors. Solar cell technology is the key to a clean energy future. Solar cells directly harvest energy from the sun’s light radiation into electricity are in an ever-growing demand for future global energy production. Solar cell-based energy harvesting has attracted worldwide attention for their notable features, such as cheap renewable technology, scalable, lightweight, flexibility, versatility, no greenhouse gas emission, environment, and economy friendly and operational costs are quite low compared to other forms of power generation. Thus, solar cell technology is at the forefront of renewable energy technologies which are used in telecommunications, power plants, small devices to satellites. Aiming at large-scale implementation can be manipulated by various types used in solar cell design and exploration of new materials towards improving performance and reducing cost. Therefore, in-depth knowledge about solar cell design is fundamental for those who wish to apply this knowledge and understanding in industries and academics. This book provides a comprehensive overview on solar cells and explores the history to evolution and present scenarios of solar cell design, classification, properties, various semiconductor materials, thin films, wafer-scale, transparent solar cells, and so on. It also includes solar cells’ characterization analytical tools, theoretical modeling, practices to enhance conversion efficiencies, applications and patents.

Low Cost Back Contact Heterojunction Solar Cells on Thin C-Si Wafers. Integrating Laser and Thin Film Processing for Improved Manufacturability

Download Low Cost Back Contact Heterojunction Solar Cells on Thin C-Si Wafers. Integrating Laser and Thin Film Processing for Improved Manufacturability PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 97 pages
Book Rating : 4.:/5 (951 download)

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Book Synopsis Low Cost Back Contact Heterojunction Solar Cells on Thin C-Si Wafers. Integrating Laser and Thin Film Processing for Improved Manufacturability by :

Download or read book Low Cost Back Contact Heterojunction Solar Cells on Thin C-Si Wafers. Integrating Laser and Thin Film Processing for Improved Manufacturability written by and published by . This book was released on 2015 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interdigitated back contact (IBC) Si wafer solar cell with deposited a-Si heterojunction (HJ) emitter and contacts is considered the ultimate single junction Si solar cell design. This was confirmed in 2014 by both Panasonic and Sharp Solar producing IBC-HJ cells breaking the previous record Si solar cell efficiency of 25%. But manufacturability at low cost is a concern for the complex IBC-HJ device structure. In this research program, our goals were to addressed the broad industry need for a high-efficiency c-Si cell that overcomes the dominant module cost barriers by 1) developing thin Si wafers synthesized by innovative, kerfless techniques; 2) integrating laser-based processing into most aspects of solar cell fabrication, ensuring high speed and low thermal budgets ; 3) developing an all back contact cell structure compatible with thin wafers using a simplified, low-temperature fabrication process; and 4) designing the contact patterning to enable simplified module assembly. There were a number of significant achievements from this 3 year program. Regarding the front surface, we developed and applied new method to characterize critical interface recombination parameters including interface defect density Dit and hole and electron capture cross-section for use as input for 2D simulation of the IBC cell to guide design and loss analysis. We optimized the antireflection and passivation properties of the front surface texture and a-Si/a-SiN/a-SiC stack depositions to obtain a very low (

Green Energy

Author : Suman Lata Tripathi
Publisher : John Wiley & Sons
ISBN 13 : 1119760763
Total Pages : 640 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Green Energy by : Suman Lata Tripathi

Download or read book Green Energy written by Suman Lata Tripathi and published by John Wiley & Sons. This book was released on 2021-02-17 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like most industries around the world, the energy industry has also made, and continues to make, a long march toward “green” energy. The science has come a long way since the 1970s, and renewable energy and other green technologies are becoming more and more common, replacing fossil fuels. It is, however, still a struggle, both in terms of energy sources keeping up with demand, and the development of useful technologies in this area. To maintain the supply for electrical energy, researchers, engineers and other professionals in industry are continuously exploring new eco-friendly energy technologies and power electronics, such as solar, wind, tidal, wave, bioenergy, and fuel cells. These technologies have changed the concepts of thermal, hydro and nuclear energy resources by the adaption of power electronics advancement and revolutionary development in lower manufacturing cost for semiconductors with long time reliability. The latest developments in renewable resources have proved their potential to boost the economy of any country. Green energy technology has not only proved the concept of clean energy but also reduces the dependencies on fossil fuel for electricity generation through smart power electronics integration. Also, endless resources have more potential to cope with the requirements of smart building and smart city concepts. A valuable reference for engineers, scientists, chemists, and students, this volume is applicable to many different fields, across many different industries, at all levels. It is a must-have for any library.

Silicon Based Heterojunction Solar Cells and Photodetectors

Author : Zhen Gao
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Silicon Based Heterojunction Solar Cells and Photodetectors by : Zhen Gao

Download or read book Silicon Based Heterojunction Solar Cells and Photodetectors written by Zhen Gao and published by . This book was released on 2017 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar energy is one of the most important clean and renewable energy options for fossil fuel replacement. Efforts have been placed on high performance and low cost solar devices for decades. Although the targets of high performance and low cost have been achieved separately, finding the sweet point between the two is challenging. Si based heterojunction device is one of the most promising technologies for achieving high performance and low cost at the same time. Currently, Heterojunction with Intrinsic Thin layer (HIT) solar cell is the most popular structure with intrinsic and highly doped a-Si:H thin films. It also holds the Si based single junction solar cell energy conversion efficiency record since 2014. However, two main constraints exist for such type of solar cells: 1. device performance is highly sensitive to the properties of intrinsic thin layer; any high temperature process can change the heterojunction behavior easily; 2. high cost Transparent Conductive Oxide (TCO) is included in the structure which has low temperature tolerance and therefore standard industrial metallization methods are not applicable for such devices. One possible solution to mitigate the disadvantages mentioned above is poly-Si/c-Si heterojunction structure. Poly-Si thin film is well-developed material which is much less sensitive to fabrication conditions. Poly-Si thin film fabricated by Low Pressure Chemical Vapor Deposition (LPCVD) has the advantages of relatively low thermal budget, high through put and high quality. Furthermore, the poly-Si thin film can be doped during deposition, which eliminates further high temperature diffusion or dopant activation processes. The conductivity of doped poly-Si thin film is reasonably high. Therefore, it is possible to eliminated the application of TCO layer. On one hand, bring down the material cost; on the other hand enable standard industrial metallization methods. Challenges exist on achieving high current output and high fill factor (FF) for poly-Si/c-Si heterojunction solar cells. Because, high current output requires thin poly-Si layer for better blue response, while high FF requires thick poly-Si layer for lower series resistance loss. In this research, an interface passivation layer and rapid thermal annealing process are analyzed and applied to achieve high current output and high FF at the same time. With non-textured planar solar cell, Jsc and FF of 29.37 mA/cm2 and 79.1% are achieved at the same time. Different types of Si based heterojunctions exhibit very different device behaviors. With the knowledge of Si based heterojunction analysis, the properties of Al-ZnO/Si heterojunction are analyzed in details. The superior junction properties of Al-ZnO/(n)Si over Al-ZnO/(p)Si structure are identified and explained in a systematic comparative study. The photoresponse mechanisms for Al-ZnO/Si heterojunction are explained and verified with experimental results. With the in depth understanding of Al-ZnO/(n)Si heterojunction structure, further modifications on the device are applied. Namely, thickness of Al-ZnO thin film is optimized and an interface passivation layer is applied. A high performance broadband photodetector is fabricated and presented with close to theoretical maximum responsivity for red color wavelength at self-powered mode.

Heterojunction Solar Cells

Author : Richard L. Anderson
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Heterojunction Solar Cells by : Richard L. Anderson

Download or read book Heterojunction Solar Cells written by Richard L. Anderson and published by . This book was released on 1977 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Multiscale Modeling of Silicon Heterojunction Solar Cells

Author : Pradyumna Muralidharan
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Multiscale Modeling of Silicon Heterojunction Solar Cells by : Pradyumna Muralidharan

Download or read book Multiscale Modeling of Silicon Heterojunction Solar Cells written by Pradyumna Muralidharan and published by . This book was released on 2019 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon photonic technology continues to dominate the solar industry driven by steady improvement in device and module efficiencies. Currently, the world record conversion efficiency (~26.6%) for single junction silicon solar cell technologies is held by silicon heterojunction (SHJ) solar cells based on hydrogenated amorphous silicon (a-Si:H) and crystalline silicon (c-Si). These solar cells utilize the concept of carrier selective contacts to improve device efficiencies. A carrier selective contact is designed to optimize the collection of majority carriers while blocking the collection of minority carriers. In the case of SHJ cells, a thin intrinsic a-Si:H layer provides crucial passivation between doped a-Si:H and the c-Si absorber that is required to create a high efficiency cell. There has been much debate regarding the role of the intrinsic a-Si:H passivation layer on the transport of photogenerated carriers, and its role in optimizing device performance. In this work, a multiscale model is presented which utilizes different simulation methodologies to study interfacial transport across the intrinsic a-Si:H/c-Si heterointerface and through the a-Si:H passivation layer. In particular, an ensemble Monte Carlo simulator was developed to study high field behavior of photogenerated carriers at the intrinsic a-Si:H/c-Si heterointerface, a kinetic Monte Carlo program was used to study transport of photogenerated carriers across the intrinsic a-Si:H passivation layer, and a drift-diffusion model was developed to model the behavior in the quasi-neutral regions of the solar cell. This work reports de-coupled and self-consistent simulations to fully understand the role and effect of transport across the a-Si:H passivation layer in silicon heterojunction solar cells, and relates this to overall solar cell device performance.

Nanostructured Solar Cells

Author : Narottam Das
Publisher : BoD – Books on Demand
ISBN 13 : 953512935X
Total Pages : 316 pages
Book Rating : 4.5/5 (351 download)

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Book Synopsis Nanostructured Solar Cells by : Narottam Das

Download or read book Nanostructured Solar Cells written by Narottam Das and published by BoD – Books on Demand. This book was released on 2017-02-22 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured solar cells are very important in renewable energy sector as well as in environmental aspects, because it is environment friendly. The nano-grating structures (such as triangular or conical shaped) have a gradual change in refractive index which acts as a multilayer antireflective coating that is leading to reduced light reflection losses over broadband ranges of wavelength and angle of incidence. There are different types of losses in solar cells that always reduce the conversion efficiency, but the light reflection loss is the most important factor that decreases the conversion efficiency of solar cells significantly. The antireflective coating is an optical coating which is applied to the surface of lenses or any optical devices to reduce the light reflection losses. This coating assists for the light trapping capturing capacity or improves the efficiency of optical devices, such as lenses or solar cells. Hence, the multilayer antireflective coatings can reduce the light reflection losses and increases the conversion efficiency of nanostructured solar cells.

17.5% P-Type Silicon Heterojunction Solar Cells with HWCVD A-Si

Author : M. R. Page
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis 17.5% P-Type Silicon Heterojunction Solar Cells with HWCVD A-Si by : M. R. Page

Download or read book 17.5% P-Type Silicon Heterojunction Solar Cells with HWCVD A-Si written by M. R. Page and published by . This book was released on 2005 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin hydrogenated amorphous silicon (a-Si:H) layers deposited by hot-wire chemical vapor deposition (HWCVD) are used as both emitters and back contacts in silicon heterojunction solar cells. Low interface recombination velocity and high open-circuit voltage are achieved by a low substrate temperature (150 deg C) intrinsic a-Si:H deposition which ensures immediate amorphous silicon deposition. This is followed by deposition of doped a-Si:H at a higher temperature (200 deg C) which appears to improve dopant activation. With an i/n a-Si:H emitter, we obtain a confirmed efficiency of 17.1% on textured p-type float-zone (FZ) silicon with a screen-printed aluminum back-surface-field (Al-BSF) contact. Employing a-Si:H as both the front emitter and the back contact, we achieve a confirmed efficiency of 17.5%, the highest reported efficiency for a p-type c-Si based heterojunction solar cell.