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, South Orange Avenue, 400, South Orange, United States
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
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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