대기중 안정한 MAPbI3에서의 Photo Seebeck 효과 = Photo Seebeck Effect of Air Stable MAPbI3

다국어 초록 (Multilingual Abstract)

With increasing interest in energy harvesting using heat as a next-generation eco-friendly energysource, organic-inorganic perovskite materials have emerged as promising materials for thermoelectricdevices. In particular, the photo-Seebeck effect of halide perovskite materials has attracted attention due totheir wide optical absorption spectrum and large diffusion length, depending on their composition. MAPbI3,a representative organic perovskite component, has been reported to have a Seebeck coefficient of onlyhundreds of μV/K. In this manuscript, we report a photo-Seebeck effect for bulk MAPbI3 perovskite in whichthe magnitude of the Seebeck coefficient significantly increased by 700 μV/K under illumination with a greenlaser diode. An air-stable perovskite pellet was synthesized using the alcohol substitution synthesis method,and both the Seebeck coefficient and the photocurrent increased in air, proving that enhanced Seebeckcoefficient is associated with the formation of excitons in MAPbI3. X-ray diffraction analysis found that theremnant PbI2 led to n-type electronic transport characterized by a negative Seebeck coefficient. Photo-inducedelectron transfer from MAPbI3 to the PbI2-rich phase under illumination led to dedoping of electrons, to forman MAPbI3 pellet. The significant enhancement in the Seebeck coefficient was found to depend on thecomposition of the remnant PbI2, which alters the majority carrier type in the bulk MAPbI3.