Partial oxidation of the absorber layer reduces charge carrier recombination in antimony sulfide solar cells.

Author(s) Gödel, K.C.; Roose, B.; Sadhanala, A.; Vaynzof, Y.; Pathak, S.K.; Steiner, U.
Journal Phys Chem Chem Phys
Date Published 2017 Jan 04

We investigate the effect of a post heat treatment of the absorber layer in air for antimony sulfide (Sb2S3) sensitized solar cells. Phenomenologically, exposing the Sb2S3 surface of sensitised solar cells to air at elevated temperatures is known to improve device performance. Here, we have investigated the detailed origins of this improvement. To this end, samples were annealed in air for different time periods and the build-up of an antimony oxide layer was monitored by XPS. A very short heat treatment resulted in an increase in power conversion efficiency from η = 1.4% to η = 2.4%, while longer annealing decreased the device performance. This improvement was linked to a reduction in charge carrier recombination at the interface of Sb2S3 with the organic hole conductor, arising from the oxide barrier layer, as demonstrated by intensity modulated photovoltage spectroscopy (IMVS).

DOI 10.1039/c6cp07559b
ISSN 1463-9084
Citation Phys Chem Chem Phys. 2017;19(2):14251430.

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