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

Author:

Swarnkar Abhishek12,Marshall Ashley R.13,Sanehira Erin M.14,Chernomordik Boris D.1,Moore David T.1,Christians Jeffrey A.1,Chakrabarti Tamoghna5,Luther Joseph M.1

Affiliation:

1. Chemical and Materials Science, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA.

2. Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, India.

3. Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.

4. Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA.

5. Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA.

Abstract

Maintaining a stable phase For solar cell applications, all-inorganic perovskite phases could be more stable than those containing organic cations. But the band gaps of the former, which determine the electrical conductivity of these materials, are not well matched to the solar spectrum. The cubic structure of CsPbI 3 is an exception, but it is stable in bulk only at high temperatures. Swarnkar et al. show that surfactant-coated α-CsPbI 3 quantum dots are stable at ambient conditions and have tunable band gaps in the visible range. Thin films of these materials can be made by spin coating with an antisolvent technique to minimize surfactant loss. When used in solar cells, these films have efficiencies exceeding 10%, making them promising for light harvesting or for LEDs. Science , this issue p. 92

Funder

U.S. Department of Energy

Office of Energy Efficiency and Renewable Energy

Solar Energy Technologies Office

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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