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

Luke Thomas, Theo D C Hobson, Laurie J Phillips, Kieran J Cheetham, Neil Tarbuck, Leanne A H Jones, Matt J Smiles, Chris H Don, Pardeep K Thakur, Mark Isaacs, Huw Shiel, Stephen Campbell, Vincent Barrioz, Vin Dhanak, Tim Veal, Jonathan D Major, Ken Durose*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Article number045001
Number of pages14
JournalJournal of Physics: Energy
Volume4
Issue number4
Early online date2 Aug 2022
DOIs
Publication statusE-pub ahead of print - 2 Aug 2022

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