Facile Fabrication of Large-Grain CH3NH3PbI3-xBrx Films for High-Efficiency Solar Cells via CH3NH3Br-Selective Ostwald Ripening: Article No. 12305

Kai Zhu, Joseph Berry, Mengjin Yang, Taiyang Zhang, Ge Li, Nanjie Guo, Zhen Li, Donghoe Kim

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454 Scopus Citations

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-xBrx (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 languageAmerican English
Number of pages9
JournalNature Communications
Volume7
DOIs
StatePublished - 2016

NREL Publication Number

  • NREL/JA-5900-65980

Keywords

  • Ostwald ripening
  • perovskite solar cells
  • PSC

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