Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells

Yihua Chen; Nengxu Li; Ligang Wang; Liang Li; Ziqi Xu; Haoyang Jiao; Pengfei Liu; Cheng Zhu; Huachao Zai; Mingzi Sun; Wei Zou; Shuai Zhang; Guichuan Xing; Xinfeng Liu; Jianpu Wang; Dongdong Li; Bolong Huang; Qi Chen; Huanping Zhou

doi:10.1038/s41467-019-09093-1

Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells

Yihua Chen, Nengxu Li, Ligang Wang, Liang Li, Ziqi Xu, Haoyang Jiao, Pengfei Liu, Cheng Zhu, Huachao Zai, Mingzi Sun, Wei Zou, Shuai Zhang, Guichuan Xing, Xinfeng Liu, Jianpu Wang, Dongdong Li, Bolong Huang, Qi Chen, Huanping Zhou^*

^*Corresponding author for this work

Advanced Research Institute of Multidisciplinary Science

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

215 Citations (Scopus)

Abstract

Further minimizing the defect state density in the semiconducting absorber is vital to boost the power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy to control the precursor chemistry for defects density reduction in the family of iodine based perovskite. Here the alkaline environment in precursor solution is carefully investigated as an effective parameter to suppress the incident iodine and affects the crystallization kinetics during film fabrication, via rationale adjustment of the alkalinity of additives. Especially, a ‘residual free’ weak alkaline is proposed not only to shrink the bandgap of the absorber by modulating the stoichiometry of organic cation, but also to improve the open circuit voltage in the resultant device. Consequently, the certified efficiency of 20.87% (Newport) is achieved with one of the smallest voltage deficits of 413 mV in the planar heterojunction perovskite solar cell.

Original language	English
Article number	1112
Journal	Nature Communications
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-09093-1
Publication status	Published - 1 Dec 2019

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Chen, Y., Li, N., Wang, L., Li, L., Xu, Z., Jiao, H., Liu, P., Zhu, C., Zai, H., Sun, M., Zou, W., Zhang, S., Xing, G., Liu, X., Wang, J., Li, D., Huang, B., Chen, Q., & Zhou, H. (2019). Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells. Nature Communications, 10(1), Article 1112. https://doi.org/10.1038/s41467-019-09093-1

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title = "Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells",

abstract = "Further minimizing the defect state density in the semiconducting absorber is vital to boost the power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy to control the precursor chemistry for defects density reduction in the family of iodine based perovskite. Here the alkaline environment in precursor solution is carefully investigated as an effective parameter to suppress the incident iodine and affects the crystallization kinetics during film fabrication, via rationale adjustment of the alkalinity of additives. Especially, a {\textquoteleft}residual free{\textquoteright} weak alkaline is proposed not only to shrink the bandgap of the absorber by modulating the stoichiometry of organic cation, but also to improve the open circuit voltage in the resultant device. Consequently, the certified efficiency of 20.87% (Newport) is achieved with one of the smallest voltage deficits of 413 mV in the planar heterojunction perovskite solar cell.",

author = "Yihua Chen and Nengxu Li and Ligang Wang and Liang Li and Ziqi Xu and Haoyang Jiao and Pengfei Liu and Cheng Zhu and Huachao Zai and Mingzi Sun and Wei Zou and Shuai Zhang and Guichuan Xing and Xinfeng Liu and Jianpu Wang and Dongdong Li and Bolong Huang and Qi Chen and Huanping Zhou",

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T1 - Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells

AU - Chen, Yihua

AU - Li, Nengxu

AU - Wang, Ligang

AU - Li, Liang

AU - Xu, Ziqi

AU - Jiao, Haoyang

AU - Liu, Pengfei

AU - Zhu, Cheng

AU - Zai, Huachao

AU - Sun, Mingzi

AU - Zou, Wei

AU - Zhang, Shuai

AU - Xing, Guichuan

AU - Liu, Xinfeng

AU - Wang, Jianpu

AU - Li, Dongdong

AU - Huang, Bolong

AU - Chen, Qi

AU - Zhou, Huanping

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Further minimizing the defect state density in the semiconducting absorber is vital to boost the power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy to control the precursor chemistry for defects density reduction in the family of iodine based perovskite. Here the alkaline environment in precursor solution is carefully investigated as an effective parameter to suppress the incident iodine and affects the crystallization kinetics during film fabrication, via rationale adjustment of the alkalinity of additives. Especially, a ‘residual free’ weak alkaline is proposed not only to shrink the bandgap of the absorber by modulating the stoichiometry of organic cation, but also to improve the open circuit voltage in the resultant device. Consequently, the certified efficiency of 20.87% (Newport) is achieved with one of the smallest voltage deficits of 413 mV in the planar heterojunction perovskite solar cell.

AB - Further minimizing the defect state density in the semiconducting absorber is vital to boost the power conversion efficiency of solar cells approaching Shockley-Queisser limit. However, it lacks a general strategy to control the precursor chemistry for defects density reduction in the family of iodine based perovskite. Here the alkaline environment in precursor solution is carefully investigated as an effective parameter to suppress the incident iodine and affects the crystallization kinetics during film fabrication, via rationale adjustment of the alkalinity of additives. Especially, a ‘residual free’ weak alkaline is proposed not only to shrink the bandgap of the absorber by modulating the stoichiometry of organic cation, but also to improve the open circuit voltage in the resultant device. Consequently, the certified efficiency of 20.87% (Newport) is achieved with one of the smallest voltage deficits of 413 mV in the planar heterojunction perovskite solar cell.

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JF - Nature Communications

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Impacts of alkaline on the defects property and crystallization kinetics in perovskite solar cells

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