Simulation Studies on CdTe/CdS Solar Cells with PEDOT:PSS Back Contact
Weining Wang a, Brooke Richards a
a Department of Physics, Seton Hall University
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
, Weining Wang, presentation 292
DOI: https://doi.org/10.29363/nanoge.hopv.2022.292
Publication date: 20th April 2022

Among thin films solar cells, CdTe/CdS solar cell is one of most studied type and its efficiency has increased to 22.1% over the years. One of the reasons that hinders the efficiency is that CdTe has a high electron affinity (about 4.5 eV), making it hard for a metal to form a good ohmic contact with CdTe. In our previous studies, we have shown that conducting polymers, such as PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate), with its high work function and conductivity, can be used as back-contact material for CdTe solar cell, and the efficiency is slightly lower than that with conventional metal back contact.

To further increase the efficiency of CdTe/CdS solar cells with PEDOT:PSS back contact, we need to understand how different parameters of PEDOT:PSS affects the CdTe solar cell. In this work, we show our simulation studies on those CdTe solar cells with PEDOT:PSS back-contact using wxAmps simulation software. We compared our simulation results with our experimental result, and explored further what parameters are needed for PEDOT:PSS as a good back-contact of CdTe solar cells. The results will guide us in choose the right parameters and even different conducting polymers for CdTe back contact.

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