The Optical Property Characterization of AgGaTe2 Prepared by the Two-Step Closed Space Sublimation

Aya Uruno; Masakazu Kobayashi

doi:10.1002/pssa.201800592

The Optical Property Characterization of AgGaTe₂ Prepared by the Two-Step Closed Space Sublimation

Aya Uruno^*, Masakazu Kobayashi

^*Corresponding author for this work

School of Advanced Science and Engineering

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

1 Citation (Scopus)

Abstract

Since its bandgap is close to optimum value, AgGaTe₂ is regarded as a promising material for solar cells. This paper reports the result of photoluminescence (PL) experiments on AgGaTe₂ thin films prepared by the two-step closed space sublimation method. In particular, the effect of by-products including Ag₂Te or AgGa₅Te₈ on PL properties of AgGaTe₂ is investigated. The radiative recombination process is also explored. PL measurements of thin films are performed by changing the excitation intensity and measured temperature. It is confirmed that the emission band probably derived from defects and impurities exists near 1.02 eV and the emission band derived from free exciton (FE) exists around 1.32 eV, and the variation of FE emission intensity is affected by the Ag/Ga ratio in AgGaTe₂. It is also investigated that the activation energy (E_A) of the FE emission is about 7.8 meV.

Original language	English
Article number	1800592
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	216
Issue number	1
DOIs	https://doi.org/10.1002/pssa.201800592
Publication status	Published - 2019 Jan 9

Keywords

chalcopyrites
closed space sublimation
photoluminescence
solar cells

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1002/pssa.201800592

Cite this

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title = "The Optical Property Characterization of AgGaTe2 Prepared by the Two-Step Closed Space Sublimation",

abstract = "Since its bandgap is close to optimum value, AgGaTe2 is regarded as a promising material for solar cells. This paper reports the result of photoluminescence (PL) experiments on AgGaTe2 thin films prepared by the two-step closed space sublimation method. In particular, the effect of by-products including Ag2Te or AgGa5Te8 on PL properties of AgGaTe2 is investigated. The radiative recombination process is also explored. PL measurements of thin films are performed by changing the excitation intensity and measured temperature. It is confirmed that the emission band probably derived from defects and impurities exists near 1.02 eV and the emission band derived from free exciton (FE) exists around 1.32 eV, and the variation of FE emission intensity is affected by the Ag/Ga ratio in AgGaTe2. It is also investigated that the activation energy (EA) of the FE emission is about 7.8 meV.",

keywords = "chalcopyrites, closed space sublimation, photoluminescence, solar cells",

author = "Aya Uruno and Masakazu Kobayashi",

note = "Funding Information: This work was supported in part by Waseda University Grant for Special Research Projects, Grant-in-Aid for Young Scientists (Early Bird) at Waseda Research Institute for Science and Engineering, and the Sasakawa Scientific Research Grant from The Japan Science Society. Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2019",

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doi = "10.1002/pssa.201800592",

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AU - Kobayashi, Masakazu

N1 - Funding Information: This work was supported in part by Waseda University Grant for Special Research Projects, Grant-in-Aid for Young Scientists (Early Bird) at Waseda Research Institute for Science and Engineering, and the Sasakawa Scientific Research Grant from The Japan Science Society. Publisher Copyright: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2019/1/9

Y1 - 2019/1/9

N2 - Since its bandgap is close to optimum value, AgGaTe2 is regarded as a promising material for solar cells. This paper reports the result of photoluminescence (PL) experiments on AgGaTe2 thin films prepared by the two-step closed space sublimation method. In particular, the effect of by-products including Ag2Te or AgGa5Te8 on PL properties of AgGaTe2 is investigated. The radiative recombination process is also explored. PL measurements of thin films are performed by changing the excitation intensity and measured temperature. It is confirmed that the emission band probably derived from defects and impurities exists near 1.02 eV and the emission band derived from free exciton (FE) exists around 1.32 eV, and the variation of FE emission intensity is affected by the Ag/Ga ratio in AgGaTe2. It is also investigated that the activation energy (EA) of the FE emission is about 7.8 meV.

AB - Since its bandgap is close to optimum value, AgGaTe2 is regarded as a promising material for solar cells. This paper reports the result of photoluminescence (PL) experiments on AgGaTe2 thin films prepared by the two-step closed space sublimation method. In particular, the effect of by-products including Ag2Te or AgGa5Te8 on PL properties of AgGaTe2 is investigated. The radiative recombination process is also explored. PL measurements of thin films are performed by changing the excitation intensity and measured temperature. It is confirmed that the emission band probably derived from defects and impurities exists near 1.02 eV and the emission band derived from free exciton (FE) exists around 1.32 eV, and the variation of FE emission intensity is affected by the Ag/Ga ratio in AgGaTe2. It is also investigated that the activation energy (EA) of the FE emission is about 7.8 meV.

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KW - solar cells

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