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

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Science  02 Feb 2017:
eaai9081
DOI: 10.1126/science.aai9081

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Abstract

Planar perovskite solar cells made entirely via solution-processing at low temperatures (<150°C) offer promise for simple manufacturing, compatibility with flexible substrates, and perovskite-based tandem devices; however, they require an electron-selective layer that performs well with similar processing. We report a contact passivation strategy using chlorine-capped TiO2 colloidal nanocrystal (NC) film that mitigates interfacial recombination and improves interface binding in low-temperature planar solar cells. We fabricated solar cells with certified efficiencies of 20.1% and 19.5% for active areas of 0.049 and 1.1 square centimeters, respectively, achieved via low-temperature solution processing. Solar cells with efficiency >20% retained 90% (97% after dark recovery) of their initial performance after 500 hours continuous room-temperature operation at their maximum power point under one-sun illumination.

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