Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4829920
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We examined the 4K photoluminescence spectra of over a dozen Cu2ZnSnS4 films and eight devices. We show that samples deficient in zinc show on average a higher quasi donor-acceptor pair (QDAP) density. However, the QDAP density in samples with the same metal composition also varies widely. Devices prepared with similar metal compositions show different open-circuit voltages and fill factors. These metrics are correlated with the concentration of QDAPs in the absorbers. One additional device with insufficient zinc showed the empirically observed low-efficiency expected for this composition. This sample also showed the highest quasi donor-acceptor pair density of all the devices measured. (C) 2013 AIP Publishing LLC.
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