SOLAR CELLS

Healing perovskite thin films

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Science  07 Aug 2015:
Vol. 349, Issue 6248, pp. 599-600
DOI: 10.1126/science.349.6248.599-d

Inorganic-organic perovskite thin films function best in solar cells when they are free of defects and grain boundaries, but the as-synthesized films are often rough and highly poly-crystalline. Zhou et al. now show that methyl ammonium lead iodide (CH3NH3PbI3) rapidly reacts with gas-phase methylamine (CH3NH2) to form a liquid, and then reforms a solid film after degassing. Processed films decreased in root mean square roughness by about a factor of 25, and their overall power conversion efficiency in solar cells increased from 5.0 to 14.5% after treatment.

Angew. Chem. Int. Ed. 10.1002/anie.201504379 (2015).

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