Insights into post-growth doping and proposals for CdTe:In photovoltaic devices

Thomas, Luke, Hobson, Theo D C, Phillips, Laurie J, Cheetham, Kieran J, Tarbuck, Neil, Jones, Leanne A H, Smiles, Matt J, Don, Chris H, Thakur, Pardeep K, Isaacs, Mark, Shiel, Huw, Campbell, Stephen, Barrioz, Vincent, Dhanak, Vin, Veal, Tim, Major, Jonathan D and Durose, Ken (2022) Insights into post-growth doping and proposals for CdTe:In photovoltaic devices. Journal of Physics: Energy, 4 (4). 045001. ISSN 2515-7655

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This paper is motivated by the potential advantages of higher doping and lower contact barriers in CdTe photovoltaic devices that may be realized by using n-type rather than the conventional p-type solar absorber layers. We present post-growth doping trials for indium in thin polycrystalline CdTe films using the diffusion of indium metal with indium chloride. Chemical concentrations of indium up to 1019 cm−3 were achieved and the films were verified as n-type by hard x-ray photoemission. Post-growth chlorine treatment (or InCl3) was found to compensate the n-doping. Trial structures comprising CdS/CdTe:In verified that the doped absorber structures performed as expected both before and after chloride treatment, but it is recognized that this is not an optimum combination. Hence, in order to identify how the advantages of n-type absorbers might be fully realized in future work, we also report simulations of a range of p–n junction combinations with n-CdTe, a number of which have the potential for high V oc.

Item Type: Article
Additional Information: Funding information: Research funded by EP (L01551X/1) | EPSRC (EP/T006188/1).
Uncontrolled Keywords: thin film solar cell, photovoltaics, cadmium telluride, n-type absorber, doping, indium
Subjects: F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 03 Aug 2022 08:46
Last Modified: 03 Aug 2022 09:00

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