Controllable bandgap of Cu2ZnSn(S,Se)4 thin films via simultaneous supercritical fluid chalcogenization

Yuta Nakayasu; Takaaki Tomai; Nobuto Oka; Itaru Honma

doi:10.7567/APEX.8.021201

Controllable bandgap of Cu₂ZnSn(S,Se)₄ thin films via simultaneous supercritical fluid chalcogenization

Yuta Nakayasu, Takaaki Tomai, Nobuto Oka, Itaru Honma

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Supercritical ethanol (scEtOH), with its high solubility and reducibility, can be used as a medium to fabricate chalcogenide semiconductors from stable solid chalcogen sources. We fabricated Cu₂ZnSn(S,Se)₄ films via chalcogenization of Cu-Zn-Sn oxide precursor films using scEtOH to dissolve SeO₂ and elemental sulfur (S₈). The S/Se molar ratio and the bandgap of Cu₂ZnSn(S,Se)₄ films were controlled by changing the input ratio of selenium source (SeO₂) to sulfur source (S₈). Analysis indicated that high-density atomic chalcogens are the dominant reactive species. This process may contribute to the development of non-vacuum fabrication methods for chalcogenide-semiconductor solar cells.

Original language	English
Number of pages	1
Journal	Applied Physics Express
Volume	8
Issue number	2
DOIs	https://doi.org/10.7567/APEX.8.021201
Publication status	Published - 2015 Feb 1

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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abstract = "Supercritical ethanol (scEtOH), with its high solubility and reducibility, can be used as a medium to fabricate chalcogenide semiconductors from stable solid chalcogen sources. We fabricated Cu2ZnSn(S,Se)4 films via chalcogenization of Cu-Zn-Sn oxide precursor films using scEtOH to dissolve SeO2 and elemental sulfur (S8). The S/Se molar ratio and the bandgap of Cu2ZnSn(S,Se)4 films were controlled by changing the input ratio of selenium source (SeO2) to sulfur source (S8). Analysis indicated that high-density atomic chalcogens are the dominant reactive species. This process may contribute to the development of non-vacuum fabrication methods for chalcogenide-semiconductor solar cells.",

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AU - Honma, Itaru

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