Download or read book Characterization of a Laser Doping Process for Crystalline Silicon Solar Cells written by Mawuli Francis Ametowobla and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization and Fundamental Investigation of Laser Doping for Silicon Solar Cells written by Lujia Xu and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced structures with localized contacts can enable high efficiency crystalline silicon solar cells, but they are complex and costly to fabricate using conventional techniques. Hence, the development of new, cheaper processes to produce localized contact regions is of great interest. One of the most promising processes is laser doping. This thesis explores three main areas related to the challenges of laser doping, in particular the characterization of the laser-doped regions, the degradation of the silicon/dielectric interface in the vicinity of the laser-doped regions, and the degradation of the laser processed silicon. A technique named secondary electron microscopy dopant contrast imaging (SEMDCI) is firstly introduced for the characterisation of the cross-section/top-surface of laser-doped samples. This technique can be used for a large range of different dopant sources and different laser doping methods. The technique can be employed to obtain quantitative dopant density images for p-type laser-doped regions, albeit currently over a limited range of dopant densities and with relatively large error. Using this technique, the risk of metallization shunts near the edges of dielectric film windows opened by the laser can be evaluated. Furthermore, this technique is useful for understanding the interaction between different materials during the laser doping process. The impact of the silicon nitride layer thickness in silicon dioxide / silicon nitride stacks on the properties of laser-doped lines is investigated through measurement of the doping profile near the edge of the dielectric window which is an important factor in determining the likelihood of high recombination or even shunting from the subsequent metallization process. Fundamentally, a problem of exposed and undoped silicon near the dielectric window is identified for most of the investigated parameter range. However, optimization of the laser parameters and dielectric film conditions is shown to be capable of preventing or at least minimizing this problem. Beside this problem, the residual dielectrics close to the edge might be degraded after laser process. Therefore, experimental methods are proposed to detect this possible degradation. In the last part of the thesis, boron diffused samples capped with different dielectric films (including bare surfaces) are processed using laser pulses and characterized by photoluminescence imaging (PL) to study the degradation of the electronic properties of the processed regions. In this way, without the interference of a dopant precursor, the thermal and dielectric effects are separately investigated. It is found that the thermal effects do not lead to significant damage and additional recombination, provided no severe silicon evaporation occurs. However, when a dielectric film is present, a considerable increase in recombination is observed irrespective of laser parameters. The magnitude of the increase in recombination varies substantially depending on the dielectric used. It is demonstrated that both sufficient silicon melting and low recombination can in principle be achieved, particularly using long pulse durations and small pulse distances. In addition, nitrogen gas annealing after laser process was proved to be an effective way to reduce the defects induced by both the thermal effects and dielectrics.

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.

Download or read book Characterisation and Development of Laser Processing for High Efficiency Silicon Solar Cells written by Daniel Charles Walter and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser processing of crystalline silicon solar cells is a rapidly advancing technology, which promises reduced cost and complexity in the fabrication of high efficiency cell concepts. This thesis presents a new method of characterising the recombination properties of micrometer-scale laser processed features in crystalline silicon, which is built upon luminescence-coupled numerical device simulations. Utilising this technique, a detailed investigation is performed into dielectric laser ablation, and laser doping from aluminium- oxide dielectric films with an ultraviolet excimer laser. Spectrally-resolved models of luminescence detection are implemented into a recently developed, high speed, three-dimensional device simulator. This enhancement provides a non-contact experimental link between a silicon test structure and representative one- to three-dimensional electronic simulations. This powerful and flexible combination is shown to enhance the accuracy and throughput of device characterisation, including but not limited to localised and large-area laser processed structures. In combination with the process flexibility of laser technologies, tens to hundreds of parameter variations can be quantitatively described in a single luminescence image. The detected luminescence signal is the key input to these analyses, and its accuracy is enhanced by careful consideration of a signal smearing phenomenon in silicon CCD detectors. Quantified in terms of the point-spread function, post-processing deconvolution is shown to provide an effective first-order correction of the signal smear. The extent of the smearing in silicon luminescence imaging with silicon CCD detectors is sufficient to warrant the general avoidance of spectrally unfiltered imaging. Short pass filtering in conjunction with deconvolution is shown to provide the most effective restoration. Utilising luminescence based characterisation, a fine-grained analysis of the near-surface recombination properties of high resistivity silicon is used to observe the influence of laser induced melt cycles. A broad laser parameter space is characterised by one-dimensional device simulations of laser irradiated silicon substrates. It is shown that the rapid melt cycling of silicon does not introduce near-surface recombination activity that would significantly alter recombination above and beyond that of co-located n+ and p+ diffusions and/or local contacts. Short-wavelength UV lasers have been proposed as a more depth selective means of performing dielectric ablation, a consequence of increased optical absorption. A detailed investigation of excimer laser ablation shows that in practice, a process that has no influence on the substrate is difficult to achieve. Nonetheless, conditions are demonstrated for which dielectric ablation has no measurable influence on the near-surface recombination properties, or on the distribution of pre-existing dopant profiles. This process is translated to a high efficiency back-contact solar cell, with performance on par with conventional, damage-free photolithography. A record device efficiency of 23.5% is achieved. Laser processing for crystalline silicon photovoltaics will continue to advance in research and industry. The new method of characterisation detailed in this work will simplify future process development, while the demonstrated performance of ultraviolet laser processing is further evidence of the suitability of laser technologies for high efficiency cell fabrication.

Download or read book Development and Characterization of Laser Chemical Processes for High Efficiency Silicon Solar Cells written by Sven Kluska and published by . This book was released on 2014 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Laser Doped Silicon and Overcoming Adhesion Challenges of Solar Cells with Nickel Copper Plated Contacts written by Christian Geisler and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Approach for Selective Emitter Formation and Front Side Metallization of Crystalline Silicon Solar Cells written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Crystalline Silicon Solar Cells written by Saleem Hussain Zaidi and published by Springer Nature. This book was released on 2021-08-02 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on crystalline silicon solar cell science and technology. It is written from the perspective of an experimentalist with extensive hands-on experience in modeling, fabrication, and characterization. A practical approach to solar cell fabrication is presented in terms of its three components: materials, electrical, and optical. The materials section describes wafer processing methods including saw damage removal, texturing, diffusion, and surface passivation. The electrical section focuses on formation of ohmic contacts on n and p-doped surfaces. The optical section illustrates light interaction with textured silicon surfaces in terms of geometrical, diffractive and physical optics, transmission, and surface photovoltage (SPV) spectroscopy. A final chapter analyzes performance of solar cells, fabricated with a wide range of process parameters. A brief economic analysis on the merits of crystalline silicon-based photovoltaic technology as a cottage industry is also included./div This professional reference will be an important resource for practicing engineers and technicians working with solar cell and PV manufacturing and renewable energy technologies, as well as upper-level engineering and material science students. Presents a practical approach to solar cell fabrication, and characterization; Offers modular methodology with detailed equipment and process parameters supported by experimental results; Includes processing diagrams and tables for 16% efficient solar cell fabrication.

Download or read book Development and Characterization of Resource saving Doping Processes for Industrial Silicon Solar Cells written by Marius Meßmer and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Doping from As deposited CVD Layers for High efficiency Crystalline Silicon Solar Cells written by Josh Engelhardt and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 1364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thin Film Solar Cells written by Jef Poortmans and published by John Wiley & Sons. This book was released on 2006-10-16 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin-film solar cells are either emerging or about to emerge from the research laboratory to become commercially available devices finding practical various applications. Currently no textbook outlining the basic theoretical background, methods of fabrication and applications currently exist. Thus, this book aims to present for the first time an in-depth overview of this topic covering a broad range of thin-film solar cell technologies including both organic and inorganic materials, presented in a systematic fashion, by the scientific leaders in the respective domains. It covers a broad range of related topics, from physical principles to design, fabrication, characterization, and applications of novel photovoltaic devices.

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 Solar Energy Update written by and published by . This book was released on 1983-11 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solar Cells written by Ahmed Mourtada Elseman and published by BoD – Books on Demand. This book was released on 2021-09-22 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar cell energy is the single most pressing issue facing humanity, with a more technologically advanced society requiring better energy resources. This book discusses technologies broadly, depending on how they capture and distribute solar energy or convert it into solar power. The major areas covered in this book are: • The theory of solar cells, which explains the conversion of light energy in photons into electric current. The theoretical studies are practical because they predict the fundamental limits of a solar cell. • The design and development of thin-film technology-based solar cells. • State of the art for bulk material applied for solar cells based on crystalline silicon (c-Si), also known as “solar grade silicon,” and emerging photovoltaics.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy written by and published by . This book was released on 1981 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: