Journal
SCIENCE ADVANCES
Volume 6, Issue 43, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb1336
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0016356]
- U.S. National Science Foundation [CHE-1900510]
- U.S. Department of Energy (DOE) [DE-SC0016356] Funding Source: U.S. Department of Energy (DOE)
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Successful implementation of hot carrier solar cells requires preserving high carrier temperature as carriers migrate through the active layer. Here, we demonstrated that addition of alkali cations in hybrid organic-inorganic lead halide perovskites led to substantially elevated carrier temperature, reduced threshold for phonon bottleneck, and enhanced hot carrier transport. The synergetic effects from the Rb, Cs, and K cations result in similar to 900 K increase in the effective carrier temperature at a carrier density around 10(18) cm(-3) with an excitation 1.45 eV above the bandgap. In the doped thin films, the protected hot carriers migrate 100 s of nanometers longer than the undoped sample as imaged by ultrafast microscopy. We attributed these improvements to the relaxation of lattice strain and passivation of halide vacancies by alkali cations based on x-ray structural characterizations and first principles calculations.
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