We show nanoscale phase stabilization of CsPbI quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbI (α-CsPbI)-the variant with desirable band gap-is only stable at high temperatures. We describe the formation of α-CsPbI 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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