Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI                         2                         Br Perovskite Films

Xiangyue Meng; Zheng Wang; Wei Qian; Zonglong Zhu; Teng Zhang; Yang Bai; Chen Hu; Shuang Xiao; Yinglong Yang; Shihe Yang

doi:10.1021/acs.jpclett.8b03742

Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI ₂ Br Perovskite Films

Xiangyue Meng
, Zheng Wang
, Wei Qian
, Zonglong Zhu
, Teng Zhang
, Yang Bai
, Chen Hu
, Shuang Xiao
, Yinglong Yang
, Shihe Yang^*

^*Corresponding author for this work

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

73 Citations (Scopus)

Abstract

We report an exploratory study on the crystal formation behavior of CsPbI ₂ Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI ₂ Br in the form of spinodal decomposition is observed. Significantly, the two phases spontaneously form morphing into a remarkably uniform bicontinuous nanoscale blend with high orientational correlation through the well-matched (110) plane of CsI and the (200) plane of CsPbI ₂ Br. The CsPbI ₂ Br films produced by the spinodal decomposition method not only enjoy a compact surface, low defect concentration, and long carrier lifetimes, they also retain their excellent charge transport property. By employing such a CsPbI ₂ Br film for carbon-based perovskite solar cells, power conversion efficiency exceeding 10% is achieved with remarkable thermal stability. Our results provide valuable insight into the role of CsI in perovskite crystallization and a promising approach for designing inorganic halide perovskite-based devices.

Original language	English
Pages (from-to)	194-199
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	10
Issue number	2
DOIs	https://doi.org/10.1021/acs.jpclett.8b03742
Publication status	Published - 17 Jan 2019
Externally published	Yes

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Meng, X., Wang, Z., Qian, W., Zhu, Z., Zhang, T., Bai, Y., Hu, C., Xiao, S., Yang, Y., & Yang, S. (2019). Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI ₂ Br Perovskite Films Journal of Physical Chemistry Letters, 10(2), 194-199. https://doi.org/10.1021/acs.jpclett.8b03742

@article{3c9e374d16bd4ff882dee390624e785e,

title = " Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI 2 Br Perovskite Films ",

abstract = " We report an exploratory study on the crystal formation behavior of CsPbI 2 Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI 2 Br in the form of spinodal decomposition is observed. Significantly, the two phases spontaneously form morphing into a remarkably uniform bicontinuous nanoscale blend with high orientational correlation through the well-matched (110) plane of CsI and the (200) plane of CsPbI 2 Br. The CsPbI 2 Br films produced by the spinodal decomposition method not only enjoy a compact surface, low defect concentration, and long carrier lifetimes, they also retain their excellent charge transport property. By employing such a CsPbI 2 Br film for carbon-based perovskite solar cells, power conversion efficiency exceeding 10\% is achieved with remarkable thermal stability. Our results provide valuable insight into the role of CsI in perovskite crystallization and a promising approach for designing inorganic halide perovskite-based devices.",

author = "Xiangyue Meng and Zheng Wang and Wei Qian and Zonglong Zhu and Teng Zhang and Yang Bai and Chen Hu and Shuang Xiao and Yinglong Yang and Shihe Yang",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2019",

month = jan,

day = "17",

doi = "10.1021/acs.jpclett.8b03742",

language = "English",

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journal = "Journal of Physical Chemistry Letters",

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Meng, X, Wang, Z, Qian, W, Zhu, Z, Zhang, T, Bai, Y, Hu, C, Xiao, S, Yang, Y & Yang, S 2019, ' Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI ₂ Br Perovskite Films ', Journal of Physical Chemistry Letters, vol. 10, no. 2, pp. 194-199. https://doi.org/10.1021/acs.jpclett.8b03742

Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI ₂ Br Perovskite Films . / Meng, Xiangyue; Wang, Zheng; Qian, Wei et al.
In: Journal of Physical Chemistry Letters, Vol. 10, No. 2, 17.01.2019, p. 194-199.

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

TY - JOUR

T1 - Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI 2 Br Perovskite Films

AU - Meng, Xiangyue

AU - Wang, Zheng

AU - Qian, Wei

AU - Zhu, Zonglong

AU - Zhang, Teng

AU - Bai, Yang

AU - Hu, Chen

AU - Xiao, Shuang

AU - Yang, Yinglong

AU - Yang, Shihe

PY - 2019/1/17

Y1 - 2019/1/17

N2 - We report an exploratory study on the crystal formation behavior of CsPbI 2 Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI 2 Br in the form of spinodal decomposition is observed. Significantly, the two phases spontaneously form morphing into a remarkably uniform bicontinuous nanoscale blend with high orientational correlation through the well-matched (110) plane of CsI and the (200) plane of CsPbI 2 Br. The CsPbI 2 Br films produced by the spinodal decomposition method not only enjoy a compact surface, low defect concentration, and long carrier lifetimes, they also retain their excellent charge transport property. By employing such a CsPbI 2 Br film for carbon-based perovskite solar cells, power conversion efficiency exceeding 10% is achieved with remarkable thermal stability. Our results provide valuable insight into the role of CsI in perovskite crystallization and a promising approach for designing inorganic halide perovskite-based devices.

AB - We report an exploratory study on the crystal formation behavior of CsPbI 2 Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI 2 Br in the form of spinodal decomposition is observed. Significantly, the two phases spontaneously form morphing into a remarkably uniform bicontinuous nanoscale blend with high orientational correlation through the well-matched (110) plane of CsI and the (200) plane of CsPbI 2 Br. The CsPbI 2 Br films produced by the spinodal decomposition method not only enjoy a compact surface, low defect concentration, and long carrier lifetimes, they also retain their excellent charge transport property. By employing such a CsPbI 2 Br film for carbon-based perovskite solar cells, power conversion efficiency exceeding 10% is achieved with remarkable thermal stability. Our results provide valuable insight into the role of CsI in perovskite crystallization and a promising approach for designing inorganic halide perovskite-based devices.

UR - https://www.scopus.com/pages/publications/85060165435

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DO - 10.1021/acs.jpclett.8b03742

M3 - Article

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AN - SCOPUS:85060165435

SN - 1948-7185

VL - 10

SP - 194

EP - 199

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 2

ER -

Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI ₂ Br Perovskite Films

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