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- W2902541036 abstract "Films of (FA0.79MA0.16Cs0.05)0.97Pb(I0.84Br0.16)2.97 were grown over TiO2, SnO2, indium tin oxide (ITO), and NiO. Film conductivity was interrogated by measuring the in-phase and out-of-phase forces acting between the film and a charged microcantilever. We followed the films’ conductivity versus time, frequency, light intensity, and temperature (233–312 K). Perovskite conductivity was high and light-independent over ITO and NiO. Over TiO2 and SnO2, the conductivity was low in the dark, increased with light intensity, and persisted for 10’s of seconds after the light was removed. At an elevated temperature over TiO2, the rate of conductivity recovery in the dark showed an activated temperature dependence (Ea = 0.58 eV). Surprisingly, the light-induced conductivity over TiO2 and SnO2 relaxed essentially instantaneously at a low temperature. We use a transmission-line model for mixed ionic–electronic conductors to show that the measurements presented are sensitive to the sum of electronic and ionic conductivities. We rationalize the seemingly incongruous observations using the idea that holes, introduced either by equilibration with the substrate or via optical irradiation, create iodide vacancies." @default.
- W2902541036 created "2018-12-11" @default.
- W2902541036 creator A5039708409 @default.
- W2902541036 creator A5057388137 @default.
- W2902541036 creator A5081383415 @default.
- W2902541036 creator A5085124478 @default.
- W2902541036 creator A5088003023 @default.
- W2902541036 date "2019-01-17" @default.
- W2902541036 modified "2023-10-15" @default.
- W2902541036 title "Substrate-Dependent Photoconductivity Dynamics in a High-Efficiency Hybrid Perovskite Alloy" @default.
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