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. 2016 Oct 7;354(6308):92-95.
doi: 10.1126/science.aag2700.

Quantum dot-induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics

Abhishek Swarnkar  1   2 , Ashley R Marshall  1   3 , Erin M Sanehira  1   4 , Boris D Chernomordik  1 , David T Moore  1 , Jeffrey A Christians  1 , Tamoghna Chakrabarti  5 , Joseph M Luther  6
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Quantum dot-induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics

Abhishek Swarnkar et al. Science. .

Abstract

We show nanoscale phase stabilization of CsPbI3 quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI3 is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbI3 (α-CsPbI3)-the variant with desirable band gap-is only stable at high temperatures. We describe the formation of α-CsPbI3 QD films that are phase-stable for months in ambient air. The films exhibit long-range electronic transport and were used to fabricate colloidal perovskite QD photovoltaic cells with an open-circuit voltage of 1.23 volts and efficiency of 10.77%. These devices also function as light-emitting diodes with low turn-on voltage and tunable emission.

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