Light Trapping In Thin Crystalline Silicon Solar Cells

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Light Trapping In Thin Crystalline Silicon Solar Cells

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Author : James A. Rand
language : en
Publisher:
Release Date : 1990

Light Trapping In Thin Crystalline Silicon Solar Cells written by James A. Rand and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Silicon categories.

Light Trapping In Thin Film Crystalline Silicon Solar Cells

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Author : Javaneh Boroumand Azad
language : en
Publisher:
Release Date : 2017

Light Trapping In Thin Film Crystalline Silicon Solar Cells written by Javaneh Boroumand Azad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

This dissertation presents numerical and experimental studies of a unified light trapping approach that is extremely important for all practical solar cells. A 2D hexagonal Bravais lattice diffractive pattern is studied in conjunction with the verification of the reflection mechanisms of single and double layer anti-reflective coatings in the broad range of wavelength 400 nm - 1100 nm. By varying thickness and conformity, we obtained the optimal parameters which minimize the broadband reflection from the nanostructured crystalline silicon surface over a wide range of angle 0°-65°. While the analytical design of broadband, angle independent anti-reflection coatings on nanostructured surfaces remains a scientific challenge, numerical optimization proves a viable alternative, paving the path towards practical implementation of the light trapping solar cells. A 3 [micrometer] thick light trapping solar cell is modeled in order to predict and maximize combined electron-photon harvesting in ultrathin crystalline silicon solar cells. It is shown that the higher charge carrier generation and collection in this design compensates the absorption and recombination losses and ultimately results in an increase in energy conversion efficiency. Further, 20 [micrometer] and 100 [micrometer] thick functional solar cells with the light trapping scheme are studied. The efficiency improvement is observed numerically and experimentally due to photon absorption enhancement in the light trapping cells with respect to a bare cell of same thickness.

Light Trapping For Thin Silicon Solar Cells By Femtosecond Laser Texturing

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Author :
language : en
Publisher:
Release Date : 2012

Light Trapping For Thin Silicon Solar Cells By Femtosecond Laser Texturing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Lasers categories.

Femtosecond laser texturing is used to create nano- to micron-scale surface roughness that strongly enhances light-trapping in thin crystalline silicon solar cells. Light trapping is crucial for thin solar cells where a single light-pass through the absorber is insufficient to capture the weakly absorbed red and near-infrared photons, especially with an indirect-gap semiconductor absorber layer such as crystalline Si which is less than 20 um thick. We achieve enhancement of the optical absorption from light-trapping that approaches the Yablonovitch limit.

Light Trapping With Plasmonic Back Contacts In Thin Film Silicon Solar Cells

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Author : Ulrich Wilhelm Paetzold
language : en
Publisher: Forschungszentrum Jülich
Release Date : 2013

Light Trapping With Plasmonic Back Contacts In Thin Film Silicon Solar Cells written by Ulrich Wilhelm Paetzold and has been published by Forschungszentrum Jülich this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Ultrathin Crystalline Silicon Solar Cells Incorporating Advanced Light Trapping Structures

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Author : Matthew S. Branham
language : en
Publisher:
Release Date : 2015

Ultrathin Crystalline Silicon Solar Cells Incorporating Advanced Light Trapping Structures written by Matthew S. Branham 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.

Solar photovoltaics, which convert the energy potential of photons from the sun directly into electrical power, hold immense promise as a cornerstone of a clean energy future. Yet their cost remains greater than that of conventional energy sources in most markets and a barrier to large-scale adoption. Crystalline silicon modules, with a 90% share of the worldwide photovoltaic market, have witnessed a precipitous drop in price over the last decade. But going forward, further evolutionary cost reduction will be difficult given the significant cost of the silicon wafer alone - roughly 35% of the module. Dramatically reducing the thickness of silicon used to make a solar cell from the current 350 [mu]m could rewrite the economics of photovoltaics. For thin-film crystalline silicon solar cells to deliver the anticipated cost benefits of reduced material requirements, it is essential that they also yield power conversion efficiencies comparable to commercial solar cells. A significant hurdle to realizing elevated efficiency in crystalline silicon films thinner than 20 [mu]m is the loss of current resulting from reduced photon absorption. A range of light management structures have been proposed in the literature to address this issue and many have been demonstrated to provide high absorption across the spectral range relevant to crystalline silicon, but their promise has yet to be realized in an active photovoltaic device. The focus of this thesis is the development of an experimental platform and fabrication process to evaluate the effectiveness of theoretically-designed light-trapping structures in functional photovoltaic devices. The experimental effort yielded 10-pm-thick crystalline silicon solar cells with a peak short-circuit current of 34.5 mA cm-2 and power conversion efficiency of 15.7%. The record performance for a crystalline silicon photovoltaic of such thinness is enabled by an advanced light-trapping design incorporating a 2D photonic crystal and a rear dielectric/reflector stack. A parallel line of questioning addressed in this thesis is whether periodic wavelength-scale optical structures are superior to periodic or random structures with geometric-optics-scale features. Through the synthesis of experimental and theoretical evidence, the case is constructed that wavelength-scale light-trapping structures are in fact comparable to conventional random pyramid surface structures for broad-spectrum absorption in silicon solar cells as thin as 5 [mu]m. These results have important implications for the design of cost-effective and manufacturable light-trapping structures for ultrathin crystalline silicon solar cells.

Pigmented Materials For Light Trapping In Thin Film Polycrystalline Silicon Solar Cells

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Author : Jeffrey Ellis Cotter
language : en
Publisher:
Release Date : 1996

Pigmented Materials For Light Trapping In Thin Film Polycrystalline Silicon Solar Cells written by Jeffrey Ellis Cotter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Silicon categories.

Light Trapping In Monocrystalline Silicon Solar Cells Using Random Upright Pyramids

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Author : Salman Manzoor
language : en
Publisher:
Release Date : 2014

Light Trapping In Monocrystalline Silicon Solar Cells Using Random Upright Pyramids written by Salman Manzoor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Light absorption categories.

Crystalline silicon has a relatively low absorption coefficient, and therefore, in thin silicon solar cells surface texturization plays a vital role in enhancing light absorption. Texturization is needed to increase the path length of light through the active absorbing layer. The most popular choice for surface texturization of crystalline silicon is the anisotropic wet-etching that yields pyramid-like structures. These structures have shown to be both simple to fabricate and efficient in increasing the path length; they outperform most competing surface texture. Recent studies have also shown these pyramid-like structures are not truly square-based 54.7 degree pyramids but have variable base angles and shapes. In addition, their distribution is not regular -- as is often assumed in optical models -- but random. For accurate prediction of performance of silicon solar cells, it is important to investigate the true nature of the surface texture that is achieved using anisotropic wet-etching, and its impact on light trapping. We have used atomic force microscopy (AFM) to characterize the surface topology by obtaining actual height maps that serve as input to ray tracing software. The height map also yields the base angle distribution, which is compared to the base angle distribution obtained by analyzing the angular reflectance distribution measured by spectrophotometer to validate the shape of the structures. Further validation of the measured AFM maps is done by performing pyramid density comparison with SEM micrograph of the texture. Last method employed for validation is Focused Ion Beam (FIB) that is used to mill the long section of pyramids to reveal their profile and so from that the base angle distribution is measured. After that the measured map is modified and the maps are generated keeping the positional randomness (the positions of pyramids) and height of the pyramids the same, but changing their base angles. In the end a ray tracing software is used to compare the actual measured AFM map and also the modified maps using their reflectance, transmittance, angular scattering and most importantly path length enhancement, absorbance and short circuit current with lambertian scatterer.

Light Trapping In Thin Film Silicon Solar Cells On Plastic Substrates

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Author : M. M. de Jong
language : en
Publisher:
Release Date : 2013

Light Trapping In Thin Film Silicon Solar Cells On Plastic Substrates written by M. M. de Jong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Light Trapping In Crystalline Silicon Solar Cells

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Author : Ulf Blieske
language : en
Publisher:
Release Date : 1989

Light Trapping In Crystalline Silicon Solar Cells written by Ulf Blieske and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Silicon categories.

Thin Film Crystalline Silicon Solar Cells

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Author : Rolf Brendel
language : en
Publisher: John Wiley & Sons
Release Date : 2011-02-15

Thin Film Crystalline Silicon Solar Cells written by Rolf Brendel and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-02-15 with Science categories.

This introduction to the physics of silicon solar cells focuses on thin cells, while reviewing and discussing the current status of the important technology. An analysis of the spectral quantum efficiency of thin solar cells is given as well as a full set of analytical models. This is the first comprehensive treatment of light trapping techniques for the enhancement of the optical absorption in thin silicon films.