Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 42, Pages 13067-13071Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201606574
Keywords
charge carriers; grain boundaries; perovskites; photoluminescence mapping; solar cells
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Funding
- MOST [2016YFA0200602]
- National 1000 Young Talents Program of China
- Nature Science Foundation of Liaoning Province [2015021013]
- US National Science Foundation [CHE-1309817]
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Although the power conversion efficiency of perovskite solar cells has improved rapidly, a rational path for further improvement remains unclear. The effect of large morphological heterogeneity of polycrystalline perovskite films on their device performance by photoluminescence (PL) microscopy has now been studied. Contrary to the common belief on the deleterious effect of morphological heterogeneity on carrier lifetimes and diffusivities, in neat CH3NH3PbI3(Cl) polycrystalline perovskite films, the local (intra-grain) carrier diffusivities in different grains are all surprisingly high (1.5 to 3.3 cm(2) s(-1); comparable to bulk single-crystals), and the local carrier lifetimes are long (ca. 200 ns) and surprisingly homogenous among grains, and uniform across grain boundary and interior. However, there is a large heterogeneity of carrier extraction efficiency at the perovskite grain-electrode interface. Improving homogeneity at perovskite grain-electrode contacts is thus a promising direction for improving the performance of perovskite thin-film solar cells.
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