Efficient and stable solution-processed planar perovskite solar cells via contact passivation

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Science  17 Feb 2017:
Vol. 355, Issue 6326, pp. 722-726
DOI: 10.1126/science.aai9081

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Passivating traps in perovskites

Low-temperature processing of planar organic-inorganic perovskite solar cells made through solution processing would allow for simpler manufacturing and the use of flexible substrates. However, materials currently in use form interfaces with charge carrier trap states that limit performance. Tan et al. used chlorine-capped TiO2 colloidal nanocrystal films as an electron-selective layer, which limited interface recombination in solution-processed solar cells. Such cells achieved certified efficiencies of 19.5% for active areas of 1.1 cm2.

Science, this issue p. 722