Abstract
We present an enhanced photo-Seebeck effect in air-stable MAPbI3 by optical gating, where both the Seebeck coefficient (SC) and the electrical conductivity increase significantly when illuminated by a laser diode.A PbI2-rich MAPbI3perovskite pellet exhibitedn-type charge carrier transport and showed a significant increase in the magnitude of the SC in air upon illumination. Compared with the p-type perovskite, the n-type MAPbI3 perovskite showed higher Seebeck enhancement, along with higher photoconductivity.This indicates that the residual PbI2in then-type perovskite accelerates photoinduced charge transfer at the MAPbI3/PbI2interface. The enhanced photo-Seebeck effect through dedoping induced by charge transfer can be applied to increase the thermoelectric figure of merit (ZT) in thermoelectric materials using non-destructive methods.
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