Na-Mediated Stoichiometry Control of FeS2 Thin Films: Suppression of Nanoscale S‑Deficiency and Improvement of Photoresponse

Control of the constituent phase and stoichiometry of iron pyrite (FeS2) is a prerequisite for high-performance photovoltaic devices based on this material. If the pyrite contains sulfur-deficiency-related secondary phases which have a metallic character and a high possibility of coexistence in pyri...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2019-11, Vol.11 (46), p.43244-43251
Main Authors: Moon, Dong Gwon, Rana, Tanka Raj, Rehan, Shanza, Haider Naqvi, Syed Dildar, Siddique, Yasir, Lee, Sang Min, Ahn, Seung Kyu, Cho, Yong Soo, Ahn, SeJin
Format: Article
Language:English
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Summary:Control of the constituent phase and stoichiometry of iron pyrite (FeS2) is a prerequisite for high-performance photovoltaic devices based on this material. If the pyrite contains sulfur-deficiency-related secondary phases which have a metallic character and a high possibility of coexistence in pyrite films, then significant carrier recombination is expected. In this work, the beneficial role of Na in suppressing the formation of nanoscale or amorphous sulfur-deficient secondary phases is reported with experimental evidence, leading to a higher phase purity for solution-processed pyrite films. The potential reduction of charge recombination via these metallic secondary phases results in significant improvements in both the photopotential and photocurrent intensity of Na-modified pyrite films compared with reference samples.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.9b16144