Quantum Dot-Induced Phase Stabilization of ..alpha..-CsPbI3 Perovskite for High-Efficiency Photovoltaics

Joseph Luther, Jeffrey Christians, Erin Sanehira, David Moore, Abhishek Swarnkar, Tamoghna Chakrabarti, Ashley Marshall, Boris Chernomordik

Research output: Contribution to journalArticlepeer-review

2221 Scopus Citations

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 (..alpha..-CsPbI3) -- the variant with desirable band gap -- is only stable at high temperatures. We describe the formation of ..alpha..-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.
Original languageAmerican English
Pages (from-to)92-95
Number of pages4
JournalScience
Volume354
Issue number6308
DOIs
StatePublished - 2016

NREL Publication Number

  • NREL/JA-5900-66542

Keywords

  • nanocrystal solar cells
  • perovskite solar cells
  • quantum dot solar cells

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