Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 24, Pages 14928-14933Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b02830
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Funding
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-CRG2018-3737]
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Halide perovskites are emerging as a new class of materials for thermoelectric applications owing to their low thermal conductivity and high Seebeck coefficient (thermopower). In this work, the thermoelectric parameters of vapor-deposited hybrid perovskite thin films are explored for the first time. We establish a relationship between the chemical composition and thermoelectric properties of sequentially vapor-deposited CH3NH3PbI3 films. A composition-dependent grain size and in-plane electrical conductivity evolution is observed and its influence on thermoelectric properties is analyzed. An ultralow in-plane thermal conductivity of 0.32 +/- 0.03 W m(-1) K-1 at room temperature is recorded for CH3NH3PbI3 using a chip-based 3 omega method. Thermal conductivity measurement of a series of CH3NH3PbI3 films reveals that the thermal transport is governed by the Pb-I lattice at room temperature. Furthermore, n- and p-type CH3NH3PbI3 films achieved by compositional tuning exhibit high negative (6500 mu V/K) and positive (5500 mu V/K) thermopower.
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