Quantum dot–induced phase stabilization of α-CsPbI ₃ perovskite for high-efficiency photovoltaics

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.