Trapping charges at grain boundaries and degradation of CH3NH3Pb(I1-xBr x )3 perovskite solar cells

Bich Phuong Nguyen, Gee Yeong Kim, William Jo, Byeong Jo Kim, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The electrical properties of CH3NH3Pb(I1-xBr x )3 (x = 0.13) perovskite materials were investigated under ambient conditions. The local work function and the local current were measured using Kelvin probe force microscopy and conductive atomic force microscopy, respectively. The degradation of the perovskite layers depends on their grain size. As the material degrades, an additional peak in the surface potential appears simultaneously with a sudden increase and subsequent relaxation of the local current. The potential bending at the grain boundaries and the intragrains is the most likely reason for the change of the local current surface of the perovskite layers. The improved understanding of the degradation mechanism garnered from this study helps pave the way toward an improved photo-conversion efficiency in perovskite solar cells.

Original languageEnglish
Article number315402
JournalNanotechnology
Volume28
Issue number31
DOIs
StatePublished - 14 Jul 2017

Keywords

  • Kelvin probe force microscopy
  • perovskite solar cells
  • stability

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