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

Dong Gwon Moon, Tanka Raj Rana, Shanza Rehan, Syed Dildar Haider Naqvi, Yasir Siddique, Sang Min Lee, Seung Kyu Ahn, Yong Soo Cho, Sejin Ahn

Research output: Contribution to journalArticle

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)43244-43251
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number46
Publication statusPublished - 2019 Nov 20

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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