Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI2 Br Perovskite Films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

8 Scopus Citations
View graph of relations

Author(s)

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

Detail(s)

Original languageEnglish
Pages (from-to)194-199
Journal / PublicationJournal of Physical Chemistry Letters
Volume10
Issue number2
Early online date31 Dec 2018
Publication statusPublished - 17 Jan 2019
Externally publishedYes

Abstract

We report an exploratory study on the crystal formation behavior of CsPbI2 Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI2 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 CsPbI2 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 CsPbI2 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.

Citation Format(s)

Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI2 Br Perovskite Films. / Meng, Xiangyue; Wang, Zheng; Qian, Wei; Zhu, Zonglong; Zhang, Teng; Bai, Yang; Hu, Chen; Xiao, Shuang; Yang, Yinglong; Yang, Shihe.

In: Journal of Physical Chemistry Letters, Vol. 10, No. 2, 17.01.2019, p. 194-199.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review