Abstract
Light-trapping structures are more demanding for optimal light absorption in thin film silicon solar cells. Accordingly, new design engineering of solar cells has been emphasized and found to be effective to achieve improved performance. This paper deals with a design of thin film silicon solar cells and explores the influence of bottom grating and combination of top and bottom (dual) grating as a part of back reflector with a distributed Bragg reflector (DBR). Use of metal layer as a part of back reflector has found to be promising for minimum requirement of DBR pairs. The effect of grating and anti-reflection coating thicknesses are also investigated for absorption enhancement. With optimization, high performance has been achieved from dual grating-based solar cell with a relative enhancement in short-circuit current approximately 68% while it was approximately 55% in case of bottom grating-based solar cell. Our designing efforts show enhanced absorption of light in UV and infrared part of solar spectrum.
Highlights
Nowadays, non-conventional energy sources are demanding alternatives to overcome the problem of power scarcity at worldwide
This solar cell consists of indium tin oxide-antireflection coating layer (ITO), crystalline silicon (C-si)-active region, and a back reflector composed of diffraction grating, distributed Bragg reflector (DBR), and metal layer
By comparing curves of cells A and B, we can observe an enhancement in absorption; it is dominant in infrared region of incident solar spectrum
Summary
Non-conventional energy sources are demanding alternatives to overcome the problem of power scarcity at worldwide This need has generated a huge scope of research in fundamental and advanced branches of science and technology. Silicon technology is well known which is safe, non-toxic, and cheaper for thin film solar cells; weak absorption in longer wavelength is a major issue which needed to be attained to a maximum possibility. To overcome this problem, new design engineering of solar devices are to be spotlighted which includes an efficient light-trapping structure. Distributed Bragg reflector provides total internal reflection of longer wavelength light that passes through absorbing layer of solar cell; diffraction grating diffracts
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