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Methods for Producing Single Crystal Mixed Halide Perovskites

Stage: Development
Perovskite photovoltaics are a new class of light absorbers with exceptional and unparalleled progress in solar power performance. A perovskite is any material with a specific ABX3 crystal structure. In photovoltaic applications, the A cation can be either organic, inorganic, or hybrid in composition. The B component is typically a metal cation such as lead, and X is a halide such as iodine or bromine. Work on solar cells using perovskite materials has advanced rapidly as a result of the material’s excellent light absorption, charge-carrier mobilities, and lifetimes – resulting in high device efficiencies with low-cost, industry-scalable technology. While the potential for perovskite photovoltaic devices is high, commercialization will require overcoming other challenges relating to material stability, efficiency, and environmental compatibility.

Researchers at NREL have developed a simple, low-cost, low temperature synthesis to prepare single crystal perovskites, such as MAPbBr3. This method involves heating a stoichiometric solution of PbBr2 and MABr at a temperature ranging from 40°C to 100°C in an organic solvent (e.g. dimethylformamide) to produce single crystal MAPbBr3 perovskites. In addition, this novel deposition method – alongside enhancing film crystallinity, as demonstrated through X-ray diffraction results – enables the control of doping based on the amount of Cl source added to the precursor solution.

This technology is within the Film Deposition category of NREL’s perovskite portfolio. For further information regarding NREL's broader perovskite portfolio, please visit NREL's Perovskite Patent Portfolio website.

The Film Deposition category consists of novel methods for more rapid, less expensive, and more effective means of depositing perovskite films. These techniques have been published in multiple peer-reviewed journals and are prepared for scaling to commercial levels.

For more information, contact Bill Hadley at Bill.Hadley@nrel.gov.

U.S. Patent # 9,701,696 B2

ROI 14-88

Applications and Industries

  • Photovoltaics
  • Perovskites
  • Film Deposition


  • Enables control of doping
  • Low-cost
  • Enhanced crystallinity


US Patent 97...6.pdf

Sep 3, 2019