Pseudohalide-Induced Recrystallization Engineering for CH3NH3PbI3 Film and Its Application in Highly Efficient Inverted Planar Heterojunction Perovskite Solar Cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

63 Scopus Citations
View graph of relations

Author(s)

  • Hua Dong
  • Zhaoxin Wu
  • Jun Xi
  • Xiaobao Xu
  • Lijian Zuo
  • Ting Lei
  • Xingang Zhao
  • Lijun Zhang
  • Xun Hou

Detail(s)

Original languageEnglish
Article number1704836
Journal / PublicationAdvanced Functional Materials
Volume28
Issue number2
Online published30 Nov 2017
Publication statusPublished - 10 Jan 2018

Abstract

High crystallinity and compactness of the active layer is essential for metal-halide perovskite solar cells. Here, a simple pseudohalide-induced film retreatment technology is developed as the passivation for preformed perovskite film. It is found that the retreatment process yields a controllable decomposition-to-recrystallization evolution of the perovskite film. Corresponding, it remarkably enlarges the grain size of the film in all directions, as well as improving the crystallinity and hindering the trap density. Meanwhile, owing to an intermediate catalytic effect of the pseudohalide compound (NH4SCN), no crystal orientation changing and no impurity introduction in the modified film. By integrating the modified perovskite film into the planar heterojunction solar cells, a champion power conversion efficiency of 19.44% with a stabilized output efficiency of 19.02% under 1 sun illumination is obtained, exhibiting a negligible current density–voltage hysteresis. Moreover, such a facile and low-temperature film retreatment approach guarantees the application in flexible devices, showing a best power conversion efficiency of 17.04%.

Research Area(s)

  • flexible solar cells, interfacial engineering, perovskite solar cells, pseudohalide, recrystallization

Citation Format(s)

Pseudohalide-Induced Recrystallization Engineering for CH3NH3PbI3 Film and Its Application in Highly Efficient Inverted Planar Heterojunction Perovskite Solar Cells. / Dong, Hua; Wu, Zhaoxin; Xi, Jun; Xu, Xiaobao; Zuo, Lijian; Lei, Ting; Zhao, Xingang; Zhang, Lijun; Hou, Xun; Jen, Alex K.-Y.

In: Advanced Functional Materials, Vol. 28, No. 2, 1704836, 10.01.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal