Facile fabrication of large-grain CH3NH3PbI3−xBrx films for high-efficiency solar cells via CH3NH3Br-selective Ostwald ripening

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,…

• UD
  U.S. Department of Energy

  Awards: AC36-08-GO28308, Contract No. DE-AC36-08-GO28308, DE-AC36-08
• NN
  National Natural Science Foundation of China

  Awards: Grant 51372151, 51372151, 21303103
• OO
  Office of Energy Efficiency and Renewable Energy

  Award: AC36-08-GO28308
• SE
  Solar Energy Technologies Office

  Award: DE-AC36-08-GO28308
• OO
  Office of Energy Efficiency
• NR
  National Renewable Energy Laboratory

  Awards: Contract No. DE-AC36-08-GO28308, DE-AC36-08-GO28308, DE-AC36-08