Fabrication of CuInSe2 and Cu2ZnSnSe4 films from metal-oxide precursors and SeO2 using supercritical ethanol

Takaaki Tomai; Yuta Nakayasu; Miki Yanaka; Itaru Honma

doi:10.1016/j.supflu.2015.03.003

Fabrication of CuInSe₂ and Cu₂ZnSnSe₄ films from metal-oxide precursors and SeO₂ using supercritical ethanol

Takaaki Tomai, Yuta Nakayasu, Miki Yanaka, Itaru Honma

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

1 Citation (Scopus)

Abstract

In this study, we achieved the conversions of Cu-In and Cu-Zn-Sn oxide precursor films to CuInSe₂ and Cu₂ZnSnSe₄ films, respectively, using SeO₂ as a selenium source in supercritical ethanol (EtOH). EtOH enables sufficient supply of SeO₂ to reaction field due to its high solubility. Moreover, EtOH in high temperature condition reacts with SeO₂ to form diethylselenide, Et₂Se, and elemental selenium, and shows self-oxidation to release hydrogen. These features of EtOH will contribute to the selenization for the fabrication of the metal-selenide film facilitates the fabrication of metal-selenide film with ideal band gap, even when both precursor film and selenium source are oxides. Supercritical-alcohol-assisted selenization will contribute to the development of the cost-effective non-vacuum fabrication process for metal-selenide in optical devices, such as solar cells.

Original language	English
Article number	3266
Pages (from-to)	48-53
Number of pages	6
Journal	Journal of Supercritical Fluids
Volume	101
DOIs	https://doi.org/10.1016/j.supflu.2015.03.003
Publication status	Published - 2015 Jun

Keywords

Chalcogens
Green chemistry
Selenization
Supercritical fluids
Thin films

ASJC Scopus subject areas

Chemical Engineering(all)
Condensed Matter Physics
Physical and Theoretical Chemistry

Access to Document

10.1016/j.supflu.2015.03.003

Cite this

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title = "Fabrication of CuInSe2 and Cu2ZnSnSe4 films from metal-oxide precursors and SeO2 using supercritical ethanol",

abstract = "In this study, we achieved the conversions of Cu-In and Cu-Zn-Sn oxide precursor films to CuInSe2 and Cu2ZnSnSe4 films, respectively, using SeO2 as a selenium source in supercritical ethanol (EtOH). EtOH enables sufficient supply of SeO2 to reaction field due to its high solubility. Moreover, EtOH in high temperature condition reacts with SeO2 to form diethylselenide, Et2Se, and elemental selenium, and shows self-oxidation to release hydrogen. These features of EtOH will contribute to the selenization for the fabrication of the metal-selenide film facilitates the fabrication of metal-selenide film with ideal band gap, even when both precursor film and selenium source are oxides. Supercritical-alcohol-assisted selenization will contribute to the development of the cost-effective non-vacuum fabrication process for metal-selenide in optical devices, such as solar cells.",

keywords = "Chalcogens, Green chemistry, Selenization, Supercritical fluids, Thin films",

author = "Takaaki Tomai and Yuta Nakayasu and Miki Yanaka and Itaru Honma",

note = "Funding Information: This work was financially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 25630353 . Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All Rights Reserved.",

year = "2015",

month = jun,

doi = "10.1016/j.supflu.2015.03.003",

language = "English",

volume = "101",

pages = "48--53",

journal = "Journal of Supercritical Fluids",

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AU - Tomai, Takaaki

AU - Nakayasu, Yuta

AU - Yanaka, Miki

AU - Honma, Itaru

N1 - Funding Information: This work was financially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 25630353 . Publisher Copyright: © 2015 Elsevier B.V. All Rights Reserved.

PY - 2015/6

Y1 - 2015/6

N2 - In this study, we achieved the conversions of Cu-In and Cu-Zn-Sn oxide precursor films to CuInSe2 and Cu2ZnSnSe4 films, respectively, using SeO2 as a selenium source in supercritical ethanol (EtOH). EtOH enables sufficient supply of SeO2 to reaction field due to its high solubility. Moreover, EtOH in high temperature condition reacts with SeO2 to form diethylselenide, Et2Se, and elemental selenium, and shows self-oxidation to release hydrogen. These features of EtOH will contribute to the selenization for the fabrication of the metal-selenide film facilitates the fabrication of metal-selenide film with ideal band gap, even when both precursor film and selenium source are oxides. Supercritical-alcohol-assisted selenization will contribute to the development of the cost-effective non-vacuum fabrication process for metal-selenide in optical devices, such as solar cells.

AB - In this study, we achieved the conversions of Cu-In and Cu-Zn-Sn oxide precursor films to CuInSe2 and Cu2ZnSnSe4 films, respectively, using SeO2 as a selenium source in supercritical ethanol (EtOH). EtOH enables sufficient supply of SeO2 to reaction field due to its high solubility. Moreover, EtOH in high temperature condition reacts with SeO2 to form diethylselenide, Et2Se, and elemental selenium, and shows self-oxidation to release hydrogen. These features of EtOH will contribute to the selenization for the fabrication of the metal-selenide film facilitates the fabrication of metal-selenide film with ideal band gap, even when both precursor film and selenium source are oxides. Supercritical-alcohol-assisted selenization will contribute to the development of the cost-effective non-vacuum fabrication process for metal-selenide in optical devices, such as solar cells.

KW - Chalcogens

KW - Green chemistry

KW - Selenization

KW - Supercritical fluids

KW - Thin films

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