Benefit of grain boundaries in organic-inorganic halide planar perovskite solar cells

Jae S. Yun*, Anita Ho-Baillie, Shujuan Huang, Sang H. Woo, Yooun Heo, Jan Seidel, Fuzhi Huang, Yi Bing Cheng, Martin A. Green

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

400 Citations (Scopus)


The past 2 years have seen the uniquely rapid emergence of a new class of solar cell based on mixed organic-inorganic halide perovskite. Grain boundaries are present in polycrystalline thin film solar cell, and they play an important role that could be benign or detrimental to solar-cell performance. Here we present efficient charge separation and collection at the grain boundaries measured by KPFM and c-AFM in CH3NH3PbI3 film in a CH3NH3PbI3/TiO2/FTO/glass heterojunction structure. We observe the presence of a potential barrier along the grain boundaries under dark conditions and higher photovoltage along the grain boundaries compare to grain interior under the illumination. Also, c-AFM measurement presents higher short-circuit current collection near grain boundaries, confirming the beneficial roles grain boundaries play in collecting carriers efficiently.

Original languageEnglish
Pages (from-to)875-880
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number5
Publication statusPublished - 5 Mar 2015
Externally publishedYes


  • grain boundaries
  • heterojunction solar cell
  • local current mapping
  • perovskite
  • scanning probe microscopy


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