Optical Properties Of Black Silicon An Analysis
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Optical Properties Of Black Silicon An Analysis
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Author : Suramya Sekhri
language : en
Publisher:
Release Date : 2015
Optical Properties Of Black Silicon An Analysis written by Suramya Sekhri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Silicon is the preeminent solar cell material of the day because it is the first semiconductor that was learned to commercialize and continues to be the principal semiconducting material used in photovoltaic technology for the manufacture of solar cells. Silicon, an indirect band gap semiconducting material, has a reflectance of about 30% in the visible range of wavelengths. Standard Silicon solar cells are not entirely useful in the infrared spectrum region. In order to enhance the performance of Silicon solar cells, reflectance losses must be minimized and absorption must be maximized. In the solar cell industry, anti-reflection (AR) coating is used to suppress reflection losses. AR coatings are limited in use because they only reduce the reflectance for a narrow range of wavelengths and incident angle since their functionality is based on a quarter-wavelength coating. Surface texturing is a technique, by which the reflectivity is reduced. Black Silicon is a material with surface roughness in the micron scale. Black Silicon, when used instead of Crystalline Silicon, offers the possibility to increase the absorption of light in the visible and infrared range of wavelengths. Black Silicon has a very low reflectivity in the visible range of wavelengths. It exhibits high absorptance in the visible and infrared region. The main objective of this thesis is to study the various fabrication techniques used to form Black Silicon, present a comparative study of structural differences and analyze its optical properties by simulation and compare them with the simulated and experimental optical properties of Black Silicon and Crystalline Silicon.
Black Silicon
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Author : Nuggehalli M. Ravindra
language : en
Publisher:
Release Date : 2016-05-31
Black Silicon written by Nuggehalli M. Ravindra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-05-31 with Silicon categories.
The ability to tailor the properties of silicon, by controlling its surface morphology in the form of black silicon, is anticipated to revolutionize silicon photonics. Black Silicon (BSi), one of the approaches to counter the inherent disadvantages of Si, is a surface modification of crystalline Si (c-Si). This book presents a discussion on manufacturing BSi by various methods for morphing the surface of the material, which are economical and easily applicable for mass production. Comparisons of the surfaces of BSi fabricated by various techniques are presented and thermal, electrical, electronic, and optical properties of black silicon are described. Some major applications of BSi have been given and possible future directions in the research and development of BSi and its applications are identified.
Optical Properties Of Porous Silicon
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Author : W. Theiss
language : en
Publisher:
Release Date : 1997
Optical Properties Of Porous Silicon written by W. Theiss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Silicon categories.
Black Silicon
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Author : Gagik Ayvazyan
language : en
Publisher: Springer
Release Date : 2024-03-23
Black Silicon written by Gagik Ayvazyan and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-23 with Science categories.
The book systematically accounts for the scientific and technological problems of nanostructured silicon in the form of porous and black silicon. Nanostructured silicon is currently a pioneer research topic worldwide due to its enormous potential applications for modern electronic devices, such as sensitive photodetectors, solar cells, biochemical sensors, hydrogen generators, and display devices. The main structural modifications of this nanomaterial are porous and black silicon. Porous silicon addresses crystalline silicon with nanopores and black silicon with nanoneedles. Historically, porous silicon is thought to be a kind of precursor to black silicon. The formation, research, and application of nanostructured silicon remains the main cornerstone of nanotechnologies, and this book is useful for a wide range of researchers in the fields of semiconductor physics, micro-, and nanoelectronics. The author outlines the prospect of black silicon fabrication and its various applications. As for porous silicon, the book contains a detailed analysis of this material as a precursor of black silicon. This allows it to be possible to carry out correlations between two structural modifications of nanostructured silicon to clearly and reasonably show their advantages and disadvantages. With many references to a vast resource of recently published literature, this book serves as an important and insightful source of valuable information and provides scientists and engineers with new ideas to better understand the formation processes of nanostructured silicon as well as improve and expand their properties.
Characterization Of Electrical And Optical Properties Of Silicon Based Materials
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Author : Guobin Jia
language : en
Publisher:
Release Date : 2009
Characterization Of Electrical And Optical Properties Of Silicon Based Materials written by Guobin Jia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Microbolometers
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Author : Nuggehalli Ravindra
language : en
Publisher: Woodhead Publishing
Release Date : 2021-12-01
Microbolometers written by Nuggehalli Ravindra and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-12-01 with Technology & Engineering categories.
Microbolometers: Fundamentals, Materials, and Recent Developments describes the fundamentals of microbolometers, their historic evolution, operational principles and material choices. It also explains the impact of materials on the processing and development of device characteristics. Sections address various aspects of optical properties and recommend models of properties of materials of interest for the fabrication of the uncooled microbolometers. In addition, the book presents two case studies, Honeywell and Texas Instruments, that focus on the design and manufacture of microbolometers. Finally, recent developments, applications, patents and future trends are presented. The chapter on patents will summarize the strengths and weaknesses of each of the technologies. “Please note that there is an error on the Dedication page, it should read: “To my sister, Math. G.Y. Premalatha, and my brother-in-law, the late Professor G.N. Yoganarasimhan, Professor of Water Resources Engineering and Management, for showing me the direction Describes the fundamentals of uncooled infrared detectors, operational principles and material approaches Includes case studies based on Honeywell and Texas Instruments’ work on microbolometers Provides analyses of current patents with a look towards their strengths and weaknesses
Analysis And Characterization Of Silicon Textured By Metal Assisted Etching Technique
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Author : Teck Kong Chong
language : en
Publisher:
Release Date : 2015
Analysis And Characterization Of Silicon Textured By Metal Assisted Etching Technique written by Teck Kong Chong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The efficient reflection suppression of a solar cell over a broad spectral range can be achieved by nano-scale surface textures. The fundamental reason is that the textured surface behaves like an effective medium with graded refractive index, resulting - in the optimal case - in vanishing reflectivity and appearing black under sunlight. The surface morphology is commonly known as "black Silicon" or bSi. Various methods for fabricating bSi have been developed such as reactive ion etching (RIE), metal-assisted etching (MAE) and laser texturing. MAE appears to be an interesting method because it is a flexible and potentially simple process for producing bSi. In fact, highly efficient bSi solar cells have been reported recently. Nevertheless, the energy conversion efficiency of these cells is still well below the highest achievable efficiencies. The high aspect ratio and surface area of the bSi can result in high rates of surface recombination, and therefore high values of Seff on the resulting structure. Nonetheless, no results of a systematic investigation of the correlation between optical performance, surface area increase and Seff in silicon have been reported to the best of author's knowledge. Another reason for the lower-than-optimal performance of the cells is the poor metal contact that contributes to the series resistance of the cell. Potential origins of this detrimental effect have only briefly been investigated through visual inspection, and measurements of the contact resistivity have not been made. In this thesis, an alternative 3-step MAE texturing technique which produces nanoporous silicon (MAE nSi) will be investigated using Silver (Ag) and Palladium (Pd) as catalyst. The thesis consists of two parts, namely experimental investigations and modelling. Both Ag and Pd are used to produce nano-scale structures. The optical properties of the nSi surfaces produced using these two metals are shown to be very similar. The majority of the work focuses on Ag due to the demonstrated superior electronic properties of the resulting samples. The investigation of Ag textured MAE nSi extends from basic optical performance to the effect on optical performance of high temperature process steps, initial surface roughness, the addition of a dielectric coating and encapsulation. In addition, the surface passivation and contact quality of Aluminium evaporated contacts on the nS surfaces are investigated. Optical modelling of MAE nSi provides greater insight into the light propagation behaviour of the structure. In this case, focus ion beam (FIB) has been used to acquire SEM images of the surface morphology. The reconstructed surface was then imported into GDCalc software for calculating the reflectance and transmittance matrices which can then be used to further analysis. Light propagation inside the bulk can then be calculated using an incoherent model. The modelling results were then compared to experimental results and also an ideal Lambertian model. Finally the generation profile was obtained. The generation profile is useful for investigating the potential efficiency of a solar cell.
The Effect Of Selected Impurities On Some Optical Properties Of Silicon
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Author : Neil Herman Schilmoeller
language : en
Publisher:
Release Date : 1965
The Effect Of Selected Impurities On Some Optical Properties Of Silicon written by Neil Herman Schilmoeller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Physical optics categories.
Amorphous Porous And Black Silicon For Photonic Applications
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Author :
language : en
Publisher:
Release Date : 2004
Amorphous Porous And Black Silicon For Photonic Applications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
This report results from a contract tasking Koc University as follows: The contractor will investigate photoluminescance and optical reflection, transmission and absorption in three types of silicon amorphous, porous, and "black" silicon, and correlate the optical properties with morphological features. All three types of silicon exhibit strong luminescence and novel optical properties. These forms of silicon could potentially lead to new optical, photonic and electrical devices such as heads-up displays, optical detectors, and optical switches for telecommunications.
Structural And Optical Properties Of Porous Silicon Nanostructures
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Author : G Amato
language : en
Publisher: CRC Press
Release Date : 1998-02-25
Structural And Optical Properties Of Porous Silicon Nanostructures written by G Amato and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-02-25 with Technology & Engineering categories.
This volume provides a comprehensive review of the experimental and theoretical aspects of the optical and transport properties of nanoporous silicon, their relation to the microscopic structure of nanocrystals, and the application of porous silicon in optical devices. As porous silicon is an ideal substance for the modelling of optical processes in nanocrystalline materials, this volume also is an excellent reference source on the more general subject of the structural and optical properties of nanocrystalline semiconductors.