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

Here, 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 also 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%. Furthermore, these devices function as light-emitting diodes with low turn-on voltage and tunable emission.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [4]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science; Indian Inst. of Science Education and Research (IISER), Pune (India). Dept. of Chemistry
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science; Univ. of Colorado, Boulder, CO (United States). Dept. of Chemistry and Biochemistry
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science; Univ. of Washington, Seattle, WA (United States). Dept. of Electrical Engineering
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science
  5. Colorado School of Mines, Golden, CO (United States). Metalurgical and Materials Engineering
Publication Date:
OSTI Identifier:
1328731
Report Number(s):
NREL/JA-5900-66542
Journal ID: ISSN 0036-8075
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 354; Journal Issue: 6308; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; perovskite solar cells; quantum dot solar cells; nanocrystal solar cells