Efficient carrier separation and intriguing switching of bound charges in inorganic-organic lead halide solar cells

Gee Yeong Kim, Seol Hee Oh, Bich Phuong Nguyen, William Jo, Byeong Jo Kim, Dong Geon Lee, Hyun Suk Jung

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

We fabricated a mesoporous perovskite solar cell with a ∼14% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH3NH3Pb(I0.88,Br0.12)3 showed a significant potential barrier bending at the grain boundary and induced passivation. The potential difference value in the x = 0.00 sample is ∼50 mV, and the distribution of the positive potential is lower than that of the x = 0.12 sample. We also investigated the polarization and hysteretic properties of the perovskite thin films by measuring the local piezoresponse. Specifically, the charged grain boundaries play a beneficial role in electron-hole depairing and in suppressing recombination in order to realize high-efficiency perovskite solar cells.

Original languageEnglish
Pages (from-to)2355-2362
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume6
Issue number12
DOIs
StatePublished - 18 Jun 2015

Keywords

  • grain boundary properties
  • hysteretic properties
  • mesoporous perovskite solar cell
  • polarization
  • scanning probe microscopy

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