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Investigating the role of copper in arsenic doped Cd(Se,Te) photovoltaics

journal contribution
posted on 03.08.2022, 11:12 authored by Eric Colegrove, Brian Good, Ali AbbasAli Abbas, Helio Moutinho, Steve Johnston, Chun-Sheng Jiang, Patrick O’Keefe, Michael WallsMichael Walls, David S. Albin, Matthew O. Reese

The open circuit voltage (VOC) deficit in Cd(Se,Te)-based photovoltaics remains a critical obstacle for pushing the technology closer to theoretical performance limits. Arsenic doping has become a dominant and promising route to achieve the higher p-type carrier concentrations necessary for higher VOC, but challenges associated with this alternate defect chemistry and higher doping density have hindered progress. Here we show that while arsenic doping enables high carrier concentrations (>1016 cm−3), co-doping with copper can provide a boost to VOC without a significant change to carrier concentration. A large data set is initially used to explore current-voltage and capacitance-voltage trends associated with arsenic doped devices with and without copper. A smaller subset is then used to probe these trends using a wide variety of characterization techniques. Copper is found to facilitate reduced interface recombination and potentially improved bulk absorber characteristics, though the mechanisms for these improvements are not yet clear. Despite the improved performance of co-doped devices, VOC is still far below its potential especially for highly doped devices. Low emitter doping in conjunction with high absorber doping seems to be a plausible cause for this significant deficit, though other device properties may exacerbate this problem.

Funding

U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office

Doped emitters to unlock lowest cost solar electricity

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Solar Energy Materials and Solar Cells

Volume

246

Issue

2022

Publisher

Elsevier

Version

VoR (Version of Record)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Solar Energy Materials and Solar Cells and the definitive published version is available at https://doi.org/10.1016/j.solmat.2022.111886

Acceptance date

07/07/2022

Publication date

2022-07-19

Copyright date

2022

ISSN

0927-0248

Language

en

Depositor

Prof Michael Walls. Deposit date: 1 August 2022

Article number

111886

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