Facile fabrication of large-grain CH3 NH3 PbI3-x Brx films for high-efficiency solar cells via CH3NH3 Br-selective Ostwald ripening

Mengjin Yang, Taiyang Zhang, Philip Schulz, Zhen Li, Ge Li, Dong Hoe Kim, Nanjie Guo, Joseph J. Berry, Kai Zhu, Yixin Zhao

Research output: Contribution to journalArticlepeer-review

326 Citations (Scopus)

Abstract

Organometallic halide perovskite solar cells (PSCs) have shown great promise as a low-cost, high-efficiency photovoltaic technology. Structural and electro-optical properties of the perovskite absorber layer are most critical to device operation characteristics. Here we present a facile fabrication of high-efficiency PSCs based on compact, large-grain, pinhole-free CH3NH3PbI3-x Brx (MAPbI3-xBrx) thin films with high reproducibility. A simple methylammonium bromide (MABr) treatment via spin-coating with a proper MABr concentration converts MAPbI3 thin films with different initial film qualities (for example, grain size and pinholes) to high-quality MAPbI3-xBrx thin films following an Ostwald ripening process, which is strongly affected by MABr concentration and is ineffective when replacing MABr with methylammonium iodide. A higher MABr concentration enhances I-Br anion exchange reaction, yielding poorer device performance. This MABr-selective Ostwald ripening process improves cell efficiency but also enhances device stability and thus represents a simple, promising strategy for further improving PSC performance with higher reproducibility and reliability.

Original languageEnglish
Article number12305
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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