Download or read book Investigation on the Dependence of Degradation Rate on Hole Concentration During Boron oxygen Related Light induced Degradation in Crystalline Silicon written by Alexander Graf and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boron oxygen related defects in crystalline silicon written by Bianca Lim and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2012 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cells based on crystalline silicon have already achieved efficiencies greater than 24%. In current production, however, the performance of the vast majority of crystalline silicon solar cells is well below that. The reasons for this disparity are manifold. Poor material quality is one important aspect. Material quality can be reduced by crystallographic defects and undesired impurities. In monocrystalline Czochralski silicon an important impurity is oxygen. While on its own harmless, in combination with boron, a common dopant in silicon solar cells, it is known to lead to a critical light-induced degradation of the material quality and with it cell efficiency. This phenomenon has been extensively studied in recent years and yet the true nature of the defect responsible for the degradation effect has proved to be elusive. In this work, the formation, recovery kinetics as well as the composition of these boron-oxygen-related defects was investigated in compensated silicon. This allowed for a separate investigation of the effects of boron concentration and the doping concentration not possible before. In addition, with regard to the new results, a new defect model was developed.
Download or read book Lifetime limiting Defects in Monocrystalline Silicon written by Tim Niewelt and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis discusses studies performed by the author at the Fraunhofer Institute for Solar Energy Systems, ISE in cooperation with the Freiburg Materials Research Center, FMF. The main achievements are: - A new measurement technique was developed that allows the investigation of the distribution of interstitial oxygen atoms in silicon wafers. The method is based on photoluminescence imaging and the measurement of resistivity changes upon annealing at 450 °C. This results in a high lateral resolution on full samples with reasonable effort. It thereby opens up pathways to improve the understanding of the distribution of impurities during crystal growth. Furthermore, the method can be applied to very thin wafers without loosing precision. It is therefore feasible for typical sample thicknesses in photovoltaic research, where application of infrared absorption spectroscopy becomes problematic. - An extensive literature review of the broad field of studies of the light-induced degradation caused by boron-oxygen defects is given. The review provides an overview over aspects that were subject of vivid discussions in literature. It reduces the pronounced fragmentation of the scientific discourse in the field by indentifying established and controversial findings in literature. - Detailed experiments to investigate the activation kinetics of boron-oxygen defects were performed on compensated n-type silicon. The results provide unambiguous confirmation of the strong dependence of the activation rates on the concentration of holes during illumination. This influence was demonstrated to apply to both, the fast and the slow activation processes. This finding indicates the involvement of two holes in both defect state transitions. - The recombination activity of boron-oxygen defects was investigated in dependence of sample doping and injection conditions. The experiments provide strong evidence that boron-oxygen defects introduce at least two energetic levels in the silicon band gap that interact during recombination
Download or read book Lifetime Spectroscopy written by Stefan Rein and published by Springer Science & Business Media. This book was released on 2005-11-25 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lifetime spectroscopy is one of the most sensitive diagnostic tools for the identification and analysis of impurities in semiconductors. Since it is based on the recombination process, it provides insight into precisely those defects that are relevant to semiconductor devices such as solar cells. This book introduces a transparent modeling procedure that allows a detailed theoretical evaluation of the spectroscopic potential of the different lifetime spectroscopic techniques. The various theoretical predictions are verified experimentally with the context of a comprehensive study on different metal impurities. The quality and consistency of the spectroscopic results, as explained here, confirms the excellent performance of lifetime spectroscopy.
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.
Download or read book The Theoretical and Experimental Study of the Temperature and Dopant Density Dependence of Hole Mobility Effective Mass and Resistivity in Boron doped Silicon written by Sheng S. Li and published by . This book was released on 1979 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Engineering 2003 written by Mark D. Thornbloom and published by . This book was released on 2003 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Engineering written by American Society of Mechanical Engineers. Solar Energy Division. Conference and published by . This book was released on 2003 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Photovoltaic Silicon written by Deren Yang and published by Springer. This book was released on 2019-11-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The utilization of sun light is one of the hottest topics in sustainable energy research. To efficiently convert sun power into a reliable energy – electricity – for consumption and storage, silicon and its derivatives have been widely studied and applied in solar cell systems. This handbook covers the photovoltaics of silicon materials and devices, providing a comprehensive summary of the state of the art of photovoltaic silicon sciences and technologies. This work is divided into various areas including but not limited to fundamental principles, design methodologies, wafering techniques/fabrications, characterizations, applications, current research trends and challenges. It offers the most updated and self-explanatory reference to all levels of students and acts as a quick reference to the experts from the fields of chemistry, material science, physics, chemical engineering, electrical engineering, solar energy, etc..
Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Information Abstracts written by and published by . This book was released on 1989 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Phosphorus and Boron Diffusion Gettering on the Light Induced Degradation in Multicrystalline Silicon Wafers written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Firing Temperature Profile Impact on Light Induced Degradation in Multicrystalline Silicon written by Rebekka Eberle and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Light- and elevated temperature-induced degradation (LeTID) in multicrystalline silicon can reduce the efficiency of solar cells significantly. We analyse the influence of the firing temperature profile on the degradation behaviour of neighbouring mc-Si wafers, varying peak temperatures above 800°C (measured) as well as heating and cooling ramps. The degradation intensity is determined by the normalized defect concentrations Nt* using spatially resolved and lifetime calibrated photoluminescence images. Wafers which were fired in a standard industrial fast firing furnace with steep ramps suffer from significant LeTID whereas samples that were subjected to the same or even higher peak temperatures but with slower heating and cooling rates hardly degrade. A spatially resolved analysis of Nt* over the whole wafer area shows that at the beginning of the experiment, the degradation is restricted to low-lifetime areas around dislocation clusters. After several hours, a very strong degradation is observed also in initially good grains. The possible roles of metallic impurities and hydrogen in-diffusion are discussed
Download or read book Dependence of the Light induced Degradation Kinetics of Photoconductivity and Ambipolar Diffusion Length as a Function of Doping Level in i a i Si H written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1986 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
