Abstract
Methylammonium lead halide perovskites (CH3NH3PbI3) show great promise for solar-cell materials because they are more efficient at converting sunlight into electricity than current commercial materials are. Perovskite efficiencies can reach 22%, while those of commercial materials are about 15%. However, these perovskites suffer from a serious drawback: They degrade rapidly upon exposure to oxygen and light. A group including M. Saiful Islam at the University of Bath and Saif A. Haque of Imperial College London now reports experimental and theoretical evidence for the mechanism behind this degradation (Nat. Commun. 2017, DOI: 10.1038/ncomms15218). Their findings have led them to a way to protect these promising materials. The team previously determined that when light excites these crystals, it creates electrons, which can react with O2 to make reactive superoxide species. These superoxides then wreak havoc on the perovskite crystal structure, breaking it down to PbI2, methylamine, and water. In the new work,
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