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Computer Modelling of Silicon Single Junction And Tandem Solar Cells

By Saptarshi Chakraborty

Abstract

In this thesis it has been used the detailed electrical-optical model Amorphous Semiconductor Device Modelling Programme (ASDMP), ab-initio in its electrical part, to understand and optimise the performance of various types of single and multi-junction solar cells that have the potential of producing high stabilised conversion efficiency at a reduced cost relative to standard wafer based crystalline silicon (c-Si) cells. In Part-I, dealing with PIN cells, we first explained why the open circuit voltage (Voc) of hydrogenated microcrystalline silicon (μc-Si:H) cells in general declines with increasing crystalline volume fraction, while the limiting cases of large-grained fluorinated microcrystalline silicon PIN cells and the standard mono-c-Si P/N cells show increased Voc. We have also studied hydrogenated amorphous silicon (a-Si:H) and μc-Si:H cell behaviour under variable light intensity. We next compared the performance of standard diffused P/N junction c-Si solar cells to “Heterojunction with Intrinsic Thin Layer” (HIT) cells at different ambient temperatures and showed that while HIT cells are well-adapted for use in hot regions, the former is better-suited for low temperature applications. As the performance of HIT cells is adversely affected by the defects on the wafer surface, we have modelled the photo-luminescence intensity from HIT cells to quantify these defects. Finally we have shown that a minimum of 5 μm thickness of a c-Si film, epitaxially grown by PECVD on a c-Si wafer at ~165˚C, is necessary to make cells based on this material feasible for high efficiency applications.Research was conducted under the supervision of Prof. Parsathi Chatterjee of ERU under the SPS [School of Physical Sciences]Research was carried out under IACS fellowship gran

Topics: Silicon Solar Cells, Solar Energy, Non-conventional Energy, Silicon Single Junction Solar Cells, Tandem Solar Cells, Computer Modelling - Silicon Solar Cells, Photovoltaics, Amorphous Semiconductor Device Modelling Program (ASDMP), Electro-optical Model, Single and Multi-junction Solar Cells
Year: 2019
OAI identifier: oai:arxiv.iacs.res.in:10821/8249
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