Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis

M. T. Ferdaous, S. A. Shahahmadi, P. Chelvanathan, Md Akhtaruzzaman, F. H. Alharbi, K. Sopian, Sieh Kiong Tiong, N. Amin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this study, the effects of transition metal dichalcogenide, MoS2 interfacial layer formation between the Cu2ZnSnS4 (CZTS) absorber layer and Mo back contact in a conventional CZTS thin film solar cell (TFSC) structure have been studied by numerical simulation using wxAMPS-1D software. The goal of this study is to elucidate the effects of both n and p-type MoS2 on the overall CZTS solar cell's performance from the viewpoint of metal-semiconductor junction and heterojunction band alignment. Interestingly, CZTS device, regardless of p or n-type MoS2 largely outperforms device without any MoS2 due to lower back contact barrier value. Significant transition in efficiency is noticed when acceptor (increases efficiency) or donor (decreases efficiency) concentration has a transition from 1016 cm−3 to higher concentration of 1018 cm−3 or more. Also, effect of variable electron affinity and band gap of MoS2 has been discussed from band alignment perspective. Generally, MoS2 layer with lower electron affinity and band gap is preferred to induce desirable band alignment and subsequently result in higher efficiency. All-in all, the formation of p-type MoS2 in CZTS solar cells can be tuned to improve the cell performance mainly by doping with higher acceptor doping concentration and limiting layer thickness. However, the detrimental effect of n-MoS2 can be prevented by maintaining thinner layer in the vicinity of ∼30 nm with low to moderate donor doping (<1016 cm−3).

Original languageEnglish
Pages (from-to)162-172
Number of pages11
JournalSolar Energy
Volume178
DOIs
Publication statusPublished - 15 Jan 2019

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Numerical analysis
Electron affinity
Doping (additives)
Solar cells
Energy gap
Semiconductor junctions
Transition metals
Heterojunctions
Metals
Thin film solar cells
Cu2ZnSnS4
Computer simulation

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Ferdaous, M. T., Shahahmadi, S. A., Chelvanathan, P., Akhtaruzzaman, M., Alharbi, F. H., Sopian, K., ... Amin, N. (2019). Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis. Solar Energy, 178, 162-172. https://doi.org/10.1016/j.solener.2018.11.055
Ferdaous, M. T. ; Shahahmadi, S. A. ; Chelvanathan, P. ; Akhtaruzzaman, Md ; Alharbi, F. H. ; Sopian, K. ; Tiong, Sieh Kiong ; Amin, N. / Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis. In: Solar Energy. 2019 ; Vol. 178. pp. 162-172.
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Ferdaous, MT, Shahahmadi, SA, Chelvanathan, P, Akhtaruzzaman, M, Alharbi, FH, Sopian, K, Tiong, SK & Amin, N 2019, 'Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis', Solar Energy, vol. 178, pp. 162-172. https://doi.org/10.1016/j.solener.2018.11.055

Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis. / Ferdaous, M. T.; Shahahmadi, S. A.; Chelvanathan, P.; Akhtaruzzaman, Md; Alharbi, F. H.; Sopian, K.; Tiong, Sieh Kiong; Amin, N.

In: Solar Energy, Vol. 178, 15.01.2019, p. 162-172.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis

AU - Ferdaous, M. T.

AU - Shahahmadi, S. A.

AU - Chelvanathan, P.

AU - Akhtaruzzaman, Md

AU - Alharbi, F. H.

AU - Sopian, K.

AU - Tiong, Sieh Kiong

AU - Amin, N.

PY - 2019/1/15

Y1 - 2019/1/15

N2 - In this study, the effects of transition metal dichalcogenide, MoS2 interfacial layer formation between the Cu2ZnSnS4 (CZTS) absorber layer and Mo back contact in a conventional CZTS thin film solar cell (TFSC) structure have been studied by numerical simulation using wxAMPS-1D software. The goal of this study is to elucidate the effects of both n and p-type MoS2 on the overall CZTS solar cell's performance from the viewpoint of metal-semiconductor junction and heterojunction band alignment. Interestingly, CZTS device, regardless of p or n-type MoS2 largely outperforms device without any MoS2 due to lower back contact barrier value. Significant transition in efficiency is noticed when acceptor (increases efficiency) or donor (decreases efficiency) concentration has a transition from 1016 cm−3 to higher concentration of 1018 cm−3 or more. Also, effect of variable electron affinity and band gap of MoS2 has been discussed from band alignment perspective. Generally, MoS2 layer with lower electron affinity and band gap is preferred to induce desirable band alignment and subsequently result in higher efficiency. All-in all, the formation of p-type MoS2 in CZTS solar cells can be tuned to improve the cell performance mainly by doping with higher acceptor doping concentration and limiting layer thickness. However, the detrimental effect of n-MoS2 can be prevented by maintaining thinner layer in the vicinity of ∼30 nm with low to moderate donor doping (<1016 cm−3).

AB - In this study, the effects of transition metal dichalcogenide, MoS2 interfacial layer formation between the Cu2ZnSnS4 (CZTS) absorber layer and Mo back contact in a conventional CZTS thin film solar cell (TFSC) structure have been studied by numerical simulation using wxAMPS-1D software. The goal of this study is to elucidate the effects of both n and p-type MoS2 on the overall CZTS solar cell's performance from the viewpoint of metal-semiconductor junction and heterojunction band alignment. Interestingly, CZTS device, regardless of p or n-type MoS2 largely outperforms device without any MoS2 due to lower back contact barrier value. Significant transition in efficiency is noticed when acceptor (increases efficiency) or donor (decreases efficiency) concentration has a transition from 1016 cm−3 to higher concentration of 1018 cm−3 or more. Also, effect of variable electron affinity and band gap of MoS2 has been discussed from band alignment perspective. Generally, MoS2 layer with lower electron affinity and band gap is preferred to induce desirable band alignment and subsequently result in higher efficiency. All-in all, the formation of p-type MoS2 in CZTS solar cells can be tuned to improve the cell performance mainly by doping with higher acceptor doping concentration and limiting layer thickness. However, the detrimental effect of n-MoS2 can be prevented by maintaining thinner layer in the vicinity of ∼30 nm with low to moderate donor doping (<1016 cm−3).

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Ferdaous MT, Shahahmadi SA, Chelvanathan P, Akhtaruzzaman M, Alharbi FH, Sopian K et al. Elucidating the role of interfacial MoS2 layer in Cu2ZnSnS4 thin film solar cells by numerical analysis. Solar Energy. 2019 Jan 15;178:162-172. https://doi.org/10.1016/j.solener.2018.11.055