Journal
SCIENCE
Volume 360, Issue 6384, Pages 67-70Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aap8671
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Funding
- Laboratory Directed Research and Development (LDRD) Directed Research (DR) project
- Rice University
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science [SC0012541]
- Office of Energy Efficiency and Renewable Energy [DE-FOA-0001647-1544]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1352099] Funding Source: National Science Foundation
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Light-induced structural dynamics plays a vital role in the physical properties, device performance, and stability of hybrid perovskite based optoelectronic devices. We report that continuous light illumination leads to a uniform lattice expansion in hybrid perovskite thin films, which is critical for obtaining high-efficiency photovoltaic devices. Correlated, in situ structural and device characterizations reveal that light-induced lattice expansion benefits the performances of a mixed-cation pure-halide planar device, boosting the power conversion efficiency from 18.5 to 20.5%.The lattice expansion leads to the relaxation of local lattice strain, which lowers the energetic barriers at the perovskite-contact interfaces, thus improving the open circuit voltage and fill factor. The light-induced lattice expansion did not compromise the stability of these high-efficiency photovoltaic devices under continuous operation at full-spectrum 1-sun (100 milliwatts per square centimeter) illumination for more than 1500 hours.
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