Solvothermal synthesis and tunable bandgap of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals

Kai Liang Huang; Cheng Hao Huang; Wen Tai Lin; Yaw Shyan Fu; Tzung Fang Guo

doi:10.1016/j.jallcom.2015.05.176

Solvothermal synthesis and tunable bandgap of Cu₂(Zn_1-xCo_x)SnS₄ and Cu₂(Fe_1-xCo_x)SnS₄ nanocrystals

Kai Liang Huang, Cheng Hao Huang, Wen Tai Lin, Yaw Shyan Fu, Tzung Fang Guo

Department of Photonics

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

27 Citations (Scopus)

Abstract

The tunable bandgap of Cu₂(Zn_1-xCo_x)SnS₄ and Cu₂(Fe_1-xCo_x)SnS₄ nanocrystals synthesized by the one-pot and hot-injection methods respectively was explored as a function of the Co concentration. The Co(CH₃COO)₂ precursor is superior to Co(NO₃)₂ and CoCl₂ ones in enhancing the growth of pure and stoichiometric Cu₂CoSnS₄ (CCTS) nanocrystals. During synthesis of pure Cu₂(Zn_1-xCo_x)SnS₄ nanocrystals at 270 °C for 48 h in the one-pot system, Cu₃SnS₄ forms first and then reacts with Co to form CCTS, and finally Zn incorporates into CCTS to form the Cu₂(Zn_1-xCo_x)SnS₄ alloy. The structural transition from kesterite Cu₂ZnSnS₄ to stannite CCTS occurs in the Cu₂(Zn_1-xCo_x)SnS₄ samples with the Co concentration (x) in the range of 0.3-0.6. The pure Cu₂(Fe_1-xCo_x)SnS₄ nanocrystals were synthesized at 260 °C for 30 min by the hot-injection method. The direct bandgaps of Cu₂(Zn_1-xCo_x)SnS₄ and Cu₂(Fe_1-xCo_x)SnS₄ nanocrystals can be tuned in the ranges of 1.21-1.49 and 1.30-1.46 eV respectively, which decrease almost linearly with the Co concentration, showing that Cu₂(Zn_1-xCo_x)SnS₄ and Cu₂(Fe_1-xCo_x)SnS₄ nanocrystals may be well suited for application as the absorption layer in thermoelectric and photovoltaic devices.

Original language	English
Pages (from-to)	1015-1022
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	646
DOIs	https://doi.org/10.1016/j.jallcom.2015.05.176
Publication status	Published - 2015 Jul 7

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jallcom.2015.05.176

Cite this

@article{958c88939fac4b42b0c410b1c689567c,

title = "Solvothermal synthesis and tunable bandgap of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals",

abstract = "The tunable bandgap of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals synthesized by the one-pot and hot-injection methods respectively was explored as a function of the Co concentration. The Co(CH3COO)2 precursor is superior to Co(NO3)2 and CoCl2 ones in enhancing the growth of pure and stoichiometric Cu2CoSnS4 (CCTS) nanocrystals. During synthesis of pure Cu2(Zn1-xCox)SnS4 nanocrystals at 270 °C for 48 h in the one-pot system, Cu3SnS4 forms first and then reacts with Co to form CCTS, and finally Zn incorporates into CCTS to form the Cu2(Zn1-xCox)SnS4 alloy. The structural transition from kesterite Cu2ZnSnS4 to stannite CCTS occurs in the Cu2(Zn1-xCox)SnS4 samples with the Co concentration (x) in the range of 0.3-0.6. The pure Cu2(Fe1-xCox)SnS4 nanocrystals were synthesized at 260 °C for 30 min by the hot-injection method. The direct bandgaps of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals can be tuned in the ranges of 1.21-1.49 and 1.30-1.46 eV respectively, which decrease almost linearly with the Co concentration, showing that Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals may be well suited for application as the absorption layer in thermoelectric and photovoltaic devices.",

author = "Huang, {Kai Liang} and Huang, {Cheng Hao} and Lin, {Wen Tai} and Fu, {Yaw Shyan} and Guo, {Tzung Fang}",

year = "2015",

month = jul,

day = "7",

doi = "10.1016/j.jallcom.2015.05.176",

language = "English",

volume = "646",

pages = "1015--1022",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

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AU - Huang, Kai Liang

AU - Huang, Cheng Hao

AU - Lin, Wen Tai

AU - Fu, Yaw Shyan

AU - Guo, Tzung Fang

PY - 2015/7/7

Y1 - 2015/7/7

N2 - The tunable bandgap of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals synthesized by the one-pot and hot-injection methods respectively was explored as a function of the Co concentration. The Co(CH3COO)2 precursor is superior to Co(NO3)2 and CoCl2 ones in enhancing the growth of pure and stoichiometric Cu2CoSnS4 (CCTS) nanocrystals. During synthesis of pure Cu2(Zn1-xCox)SnS4 nanocrystals at 270 °C for 48 h in the one-pot system, Cu3SnS4 forms first and then reacts with Co to form CCTS, and finally Zn incorporates into CCTS to form the Cu2(Zn1-xCox)SnS4 alloy. The structural transition from kesterite Cu2ZnSnS4 to stannite CCTS occurs in the Cu2(Zn1-xCox)SnS4 samples with the Co concentration (x) in the range of 0.3-0.6. The pure Cu2(Fe1-xCox)SnS4 nanocrystals were synthesized at 260 °C for 30 min by the hot-injection method. The direct bandgaps of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals can be tuned in the ranges of 1.21-1.49 and 1.30-1.46 eV respectively, which decrease almost linearly with the Co concentration, showing that Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals may be well suited for application as the absorption layer in thermoelectric and photovoltaic devices.

AB - The tunable bandgap of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals synthesized by the one-pot and hot-injection methods respectively was explored as a function of the Co concentration. The Co(CH3COO)2 precursor is superior to Co(NO3)2 and CoCl2 ones in enhancing the growth of pure and stoichiometric Cu2CoSnS4 (CCTS) nanocrystals. During synthesis of pure Cu2(Zn1-xCox)SnS4 nanocrystals at 270 °C for 48 h in the one-pot system, Cu3SnS4 forms first and then reacts with Co to form CCTS, and finally Zn incorporates into CCTS to form the Cu2(Zn1-xCox)SnS4 alloy. The structural transition from kesterite Cu2ZnSnS4 to stannite CCTS occurs in the Cu2(Zn1-xCox)SnS4 samples with the Co concentration (x) in the range of 0.3-0.6. The pure Cu2(Fe1-xCox)SnS4 nanocrystals were synthesized at 260 °C for 30 min by the hot-injection method. The direct bandgaps of Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals can be tuned in the ranges of 1.21-1.49 and 1.30-1.46 eV respectively, which decrease almost linearly with the Co concentration, showing that Cu2(Zn1-xCox)SnS4 and Cu2(Fe1-xCox)SnS4 nanocrystals may be well suited for application as the absorption layer in thermoelectric and photovoltaic devices.

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