Research Article

Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells

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Science  20 Mar 2020:
Vol. 367, Issue 6484, pp. 1352-1358
DOI: 10.1126/science.aba0893

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Mapping perovskite trap states

The high efficiency of hybrid inorganic-organic perovskite solar cells is mainly limited by defects that trap the charge carriers and lead to unproductive recombination. Ni et al. used drive-level capacitance profiling to map the spatial and energetic distribution of trap states in both polycrystalline and single-crystal perovskite solar cells. The interface trap densities were up to five orders of magnitude higher than the bulk trap densities. Deep traps were mainly located at the interface of perovskites and hole-transport layers, where processing created a high density of nanocrystals. These results should aid efforts aimed at avoiding trap-state formation or passivating such defects.

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