Comparing the Effect of Mn Substitution in Sulfide and Sulfoselenide-Based Kesterite Solar Cells

Stener Lie; Wenjie Li; Shin Woei Leow; Douglas M. Bishop; Oki Gunawan; Lydia Helena Wong

doi:10.1002/solr.201900521

Comparing the Effect of Mn Substitution in Sulfide and Sulfoselenide-Based Kesterite Solar Cells

Stener Lie, Wenjie Li, Shin Woei Leow, Douglas M. Bishop, Oki Gunawan, Lydia Helena Wong^*

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

Cation substitution is one of the effective ways to improve Cu₂ZnSn(S,Se)₄ (CZTSSe) photovoltaic performance. However, the commonly reported substitutes, Ag and Cd, are not ideal as they detract from the earth-abundant and nontoxic motivation of CZTSSe. Herein, the role of Mn substitution in sulfide and sulfoselenide films are compared in terms of optoelectronic properties and device performance. CZT(S,Se) + CMZT(S,Se) double-layered structures are fabricated by a sol–gel spin-coating method with variations in the CMZT(S,Se) layer thickness. It is found that a smaller amount of Mn is required to achieve the highest photovoltaic performance in sulfoselenide films in comparison with sulfide-based films. All device parameters (particularly V_oc and fill factor) of the sulfoselenide films are improved as compared with the sulfide system. Using a combination of capacitance–voltage, drive-level capacitance profiling, and photoluminescence (PL), it is found that the sulfoselenide film has a smaller interface defect density and higher hole mobility and PL intensity, which suggest much more effective charge separation and transport. In contrast, in double-layer sulfide films, Mn reduces the acceptor defect level of the absorber.

Original language	English
Article number	1900521
Journal	Solar RRL
Volume	4
Issue number	4
DOIs	https://doi.org/10.1002/solr.201900521
Publication status	Published - Apr 1 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

ASJC Scopus Subject Areas

Atomic and Molecular Physics, and Optics
Energy Engineering and Power Technology
Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Keywords

cation substitution
earth abundant
photovoltaic devices
solution processes
thin films

UN SDGs

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

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10.1002/solr.201900521

Cite this

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title = "Comparing the Effect of Mn Substitution in Sulfide and Sulfoselenide-Based Kesterite Solar Cells",

abstract = "Cation substitution is one of the effective ways to improve Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic performance. However, the commonly reported substitutes, Ag and Cd, are not ideal as they detract from the earth-abundant and nontoxic motivation of CZTSSe. Herein, the role of Mn substitution in sulfide and sulfoselenide films are compared in terms of optoelectronic properties and device performance. CZT(S,Se) + CMZT(S,Se) double-layered structures are fabricated by a sol–gel spin-coating method with variations in the CMZT(S,Se) layer thickness. It is found that a smaller amount of Mn is required to achieve the highest photovoltaic performance in sulfoselenide films in comparison with sulfide-based films. All device parameters (particularly Voc and fill factor) of the sulfoselenide films are improved as compared with the sulfide system. Using a combination of capacitance–voltage, drive-level capacitance profiling, and photoluminescence (PL), it is found that the sulfoselenide film has a smaller interface defect density and higher hole mobility and PL intensity, which suggest much more effective charge separation and transport. In contrast, in double-layer sulfide films, Mn reduces the acceptor defect level of the absorber.",

keywords = "cation substitution, earth abundant, photovoltaic devices, solution processes, thin films",

author = "Stener Lie and Wenjie Li and Leow, {Shin Woei} and Bishop, {Douglas M.} and Oki Gunawan and {Helena Wong}, Lydia",

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AU - Lie, Stener

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AU - Helena Wong, Lydia

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AB - Cation substitution is one of the effective ways to improve Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic performance. However, the commonly reported substitutes, Ag and Cd, are not ideal as they detract from the earth-abundant and nontoxic motivation of CZTSSe. Herein, the role of Mn substitution in sulfide and sulfoselenide films are compared in terms of optoelectronic properties and device performance. CZT(S,Se) + CMZT(S,Se) double-layered structures are fabricated by a sol–gel spin-coating method with variations in the CMZT(S,Se) layer thickness. It is found that a smaller amount of Mn is required to achieve the highest photovoltaic performance in sulfoselenide films in comparison with sulfide-based films. All device parameters (particularly Voc and fill factor) of the sulfoselenide films are improved as compared with the sulfide system. Using a combination of capacitance–voltage, drive-level capacitance profiling, and photoluminescence (PL), it is found that the sulfoselenide film has a smaller interface defect density and higher hole mobility and PL intensity, which suggest much more effective charge separation and transport. In contrast, in double-layer sulfide films, Mn reduces the acceptor defect level of the absorber.

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Comparing the Effect of Mn Substitution in Sulfide and Sulfoselenide-Based Kesterite Solar Cells

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

UN SDGs

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