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Optical Properties Of Hydrogenated Amorphous Germanium And Silicon Germanium Alloys
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Book Synopsis Optical Properties of Hydrogenated Amorphous Germanium and Silicon-germanium Alloys by : Anna Elizabeth Wetsel Tai
Download or read book Optical Properties of Hydrogenated Amorphous Germanium and Silicon-germanium Alloys written by Anna Elizabeth Wetsel Tai and published by . This book was released on 1994 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Native and Light Induced Defects in the Optical and Electronic Properties of Hydrogenated Amorphous Silicon Germanium (a-SiGe:H) Alloy Thin Films by : Medine Elif Dönertaş Yavaş
Download or read book The Effects of Native and Light Induced Defects in the Optical and Electronic Properties of Hydrogenated Amorphous Silicon Germanium (a-SiGe:H) Alloy Thin Films written by Medine Elif Dönertaş Yavaş and published by . This book was released on 2005 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogenated amorphous silicon-germanium alloy thin films (a-SiGe:H) of various germanium concentrations, are potential candidates meeting the requirements of high efficiency stacked solar cells and optoelectronic devices where a certain bandgap is necessary. In this thesis to obtain reliable information about the native and light induced defect states present in a-SiGe:H alloy thin films of various germanium concentrations SSPC, DBP, transmission spectroscopy and PDS techniques have been used. A procedure based on Ritter Weiser optical formulation has been applied to calculate fringe free absolute absorption coefficient spectra of a-SiGe:H alloy thin films of various Ge% from the yield DBP and simultaneously measured transmission signals for the first time. The results have been compared with those independently measured by PDS method.In the annealed state the effects of native defect states in a-SiGe:H alloy thin films of various Ge% have been investigated. For the a-SiGe:H alloy films with Ge concentration in the range of 10% to 30%, hntn-products for the photogenerated free electrons is the highest, therefore they serve as the best photoconductive absorber layer in the multijunction solar cells. The effect of Ge content in amorphous silicon network clearly indicates a systematic decrease in the bandgap with increasing Ge content. The E0v values are almost constant around 55meV for alloying up to 40% Ge. Finally the changes in the defect density present in the bandgap of alloy films are inferred from the a(1.0eV) measured by both PDS and low bias light DBP spectrum. The difference between PDS and low bias DBP spectra is attributed to the underlying physics of these methods. The best film with lowest defect density can be prepared with alloying Ge in the range from 10% to 40% Ge.In the light soaked state, samples were left under white light illumination (15 suns) for determined time intervals. SSPC measurements indicate that all samples exhibit certain degree of degradation in the magnitude of sph and hntn products. The rate of a(1.0 eV) decreases as Ge% increases in the light soaked state. Higher Ge content films (50%, 75%) show almost no degradation in sub-bandgap absorption. As the degradation slope of a(hn) and 1/hntn product are not same for all samples it can be inferred that subgap absorption and photoconductivity measurements are not controlled by the same set of defects present in the bandgap.
Book Synopsis Properties of Hydrogenated Amorphous Silicon-germanium Alloys Deposited by Dual Target Reactive Magnetron Sputtering by : Samuel J. Levang
Download or read book Properties of Hydrogenated Amorphous Silicon-germanium Alloys Deposited by Dual Target Reactive Magnetron Sputtering written by Samuel J. Levang and published by . This book was released on 2012 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogenated amorphous silicon-germanium alloy thin films (a-Si1-xGex:H) were deposited using reactive magnetron sputtering. Dual targets of silicon and germanium were sputtered in an argon + hydrogen atmosphere using RF excitation. Films with x = 0.4 were deposited as a function of substrate temperature and hydrogen partial pressure, and were evaluated by dark and photoconductivity, infrared absorption, and optical transmission. Photosensitivity reached a maximum value of about 4500 between 150 and 200°C. Using the stretching modes in the region of 2000 cm-1, the hydrogen bonding was characterized in terms of the preferential attachment ratio (PA), which represents the ratio between H bonded to Si and H bonded to Ge. The PA shows a systematic increase with increasing temperature, generally independent of hydrogen partial pressure. The interplay between thermodynamic and kinetics effects in determining PA and film quality is discussed.
Book Synopsis Electronic Properties and Metastability of Hydrogenated Amorphous Silicon-germanium Alloys with Low Germanium Content by : Kimon Christoph Palinginis
Download or read book Electronic Properties and Metastability of Hydrogenated Amorphous Silicon-germanium Alloys with Low Germanium Content written by Kimon Christoph Palinginis and published by . This book was released on 2000 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optical Properties and Local Atomic Bonding in Hydrogenated Amorphous Silicon-carbon Alloy Films by : Deepak Kumar Basa
Download or read book Optical Properties and Local Atomic Bonding in Hydrogenated Amorphous Silicon-carbon Alloy Films written by Deepak Kumar Basa and published by . This book was released on 1989 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis World Scientific Reference Of Amorphous Materials, The: Structure, Properties, Modeling And Main Applications (In 3 Volumes) by :
Download or read book World Scientific Reference Of Amorphous Materials, The: Structure, Properties, Modeling And Main Applications (In 3 Volumes) written by and published by World Scientific. This book was released on 2020-12-28 with total page 1548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amorphous solids (including glassy and non-crystalline solids) are ubiquitous since the vast majority of solids naturally occurring in our world are amorphous. Although the field is diverse and complex, this three-volume set covers the vast majority of the important concepts needed to understand these materials and their principal practical applications. One volume discusses the most important subset of amorphous insulators, namely oxide glasses; the other two volumes discuss the most important subsets of amorphous semiconductors, namely tetrahedrally coordinated amorphous semiconductors and amorphous and glassy chalcogenides. Together these three volumes provide a comprehensive set of theoretical concepts and practical information needed to become conversant in the field of amorphous materials. They are suitable for advanced graduate students, postdoctoral research associates, and researchers wishing to change fields or sub-fields.The topics covered in these three volumes include (1) concepts for understanding the structures of amorphous materials, (2) techniques to characterize the structural, electronic, and optical properties of amorphous materials, (3) the roles of defects in affecting the electronic and optical properties of amorphous materials, and (4) the concepts for understanding practical devices and other applications of amorphous materials. Applications discussed in these volumes include transistors, solar cells, displays, bolometers, fibers, non-volatile memories, vidicons, photoresists, and optical disks.
Book Synopsis Silicon, Germanium, and Their Alloys by : Gudrun Kissinger
Download or read book Silicon, Germanium, and Their Alloys written by Gudrun Kissinger and published by CRC Press. This book was released on 2014-12-09 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the vast knowledge accumulated on silicon, germanium, and their alloys, these materials still demand research, eminently in view of the improvement of knowledge on silicon-germanium alloys and the potentialities of silicon as a substrate for high-efficiency solar cells and for compound semiconductors and the ongoing development of nanodevic
Book Synopsis Electrical and Optical Properties of Amorphous Germanium by : Alton Harold Clark
Download or read book Electrical and Optical Properties of Amorphous Germanium written by Alton Harold Clark and published by . This book was released on 1967 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silicon-Germanium Alloys for Photovoltaic Applications by : Ammar Nayfeh
Download or read book Silicon-Germanium Alloys for Photovoltaic Applications written by Ammar Nayfeh and published by Elsevier. This book was released on 2023-03-09 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon-Germanium Alloys for Photovoltaic Applications provides a comprehensive look at the use of Silicon-Germanium alloys Si1-xGex in photovoltaics. Different methods of Si1-xGex alloy deposition are reviewed, including their optical and material properties as function of Ge% are summarized, with SiGe use in photovoltaic applications analyzed. Fabrication and characterization of single junction Si1-xGex solar cells on Si using a-Si as emitter is discussed, with a focus on the effect of different Ge%. Further, the book highlights the use Si1-xGex as a template for lattice matched deposition of III-V layers on Si, along with its challenges and benefits, including financial aspects. Finally, fabrication and characterization of single junction GaAsxP1-x cells on Si via Si1-xGex is discussed, along with the simulation and modeling of graded SiGe layers and experimental model verification. Includes a summary of SiGe alloys material properties relevant for solar research, all compiled at one place Presents various simulation models and analysis of SiGe material properties on solar cell performance Includes a cost-analysis for III-V/Si solar cells via SiGe alloys
Book Synopsis Optical, Electrical and Structural Properties of Nanostructured Silicon and Silicon-germanium Alloys by : Bayram Ünal
Download or read book Optical, Electrical and Structural Properties of Nanostructured Silicon and Silicon-germanium Alloys written by Bayram Ünal and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Amorphous and Microcrystalline Silicon Solar Cells: Modeling, Materials and Device Technology by : Ruud E.I. Schropp
Download or read book Amorphous and Microcrystalline Silicon Solar Cells: Modeling, Materials and Device Technology written by Ruud E.I. Schropp and published by Springer. This book was released on 2016-07-18 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amorphous silicon solar cell technology has evolved considerably since the first amorphous silicon solar cells were made at RCA Laboratories in 1974. Scien tists working in a number of laboratories worldwide have developed improved alloys based on hydrogenated amorphous silicon and microcrystalline silicon. Other scientists have developed new methods for growing these thin films while yet others have developed new photovoltaic (PV) device structures with im proved conversion efficiencies. In the last two years, several companies have constructed multi-megawatt manufacturing plants that can produce large-area, multijunction amorphous silicon PV modules. A growing number of people be lieve that thin-film photovoltaics will be integrated into buildings on a large scale in the next few decades and will be able to make a major contribution to the world's energy needs. In this book, Ruud E. I. Schropp and Miro Zeman provide an authoritative overview of the current status of thin film solar cells based on amorphous and microcrystalline silicon. They review the significant developments that have occurred during the evolution of the technology and also discuss the most im portant recent innovations in the deposition of the materials, the understanding of the physics, and the fabrication and modeling of the devices.
Book Synopsis D.C. Conductivity of Hydrogenated Amorphous Silicon-germanium Alloys by : Pritpal Singh
Download or read book D.C. Conductivity of Hydrogenated Amorphous Silicon-germanium Alloys written by Pritpal Singh and published by . This book was released on 1981 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Properties of Amorphous Hydrogenated Germanium and Its Alloys by : Stuart Bruce White
Download or read book The Properties of Amorphous Hydrogenated Germanium and Its Alloys written by Stuart Bruce White and published by . This book was released on 1989 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thin-Film Silicon Solar Cells by : Arvind Victor Shah
Download or read book Thin-Film Silicon Solar Cells written by Arvind Victor Shah and published by CRC Press. This book was released on 2010-08-19 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photovoltaic technology has now developed to the extent that it is close to fulfilling the vision of a "solar-energy world," as devices based on this technology are becoming efficient, low-cost and durable. This book provides a comprehensive treatment of thin-film silicon, a prevalent PV material, in terms of its semiconductor nature, startin
Book Synopsis The Materials Science of Semiconductors by : Angus Rockett
Download or read book The Materials Science of Semiconductors written by Angus Rockett and published by Springer Science & Business Media. This book was released on 2007-11-20 with total page 629 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes semiconductors from a materials science perspective rather than from condensed matter physics or electrical engineering viewpoints. It includes discussion of current approaches to organic materials for electronic devices. It further describes the fundamental aspects of thin film nucleation and growth, and the most common physical and chemical vapor deposition techniques. Examples of the application of the concepts in each chapter to specific problems or situations are included, along with recommended readings and homework problems.
Book Synopsis A Study of the Optical and Electrical Properties of Amorphous Germanium and Amorphous Germanium-gallium Alloys by : Robert George Buckley
Download or read book A Study of the Optical and Electrical Properties of Amorphous Germanium and Amorphous Germanium-gallium Alloys written by Robert George Buckley and published by . This book was released on 1979 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structural and Optical Properties of Amorphous Germanium by :
Download or read book The Structural and Optical Properties of Amorphous Germanium written by and published by . This book was released on 1973 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
