title: Quantum dot-induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics.
abstract: We show nanoscale phase stabilization of CsPbI3quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI3is 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-CsPbI3QD 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.
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.|Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, India.
authors.forename: Abhishek
authors.initials: A
authors.lastname: Swarnkar
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.|Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Ashley R
authors.initials: AR
authors.lastname: Marshall
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.|Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA.
authors.forename: Erin M
authors.initials: EM
authors.lastname: Sanehira
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.
authors.forename: Boris D
authors.initials: BD
authors.lastname: Chernomordik
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.
authors.forename: David T
authors.initials: DT
authors.lastname: Moore
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Christians
authors.affiliation: Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA.
authors.forename: Tamoghna
authors.initials: T
authors.lastname: Chakrabarti
authors.affiliation: Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA. joey.luther@nrel.gov.
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Luther