Cooperative Boosting Performance of Halide Perovskite Solar Cells between Photoelectric and Thermoelectric Effect

Abstract The sufficient utilization of longer-wavelength infrared light is a long-sought goal for efficient perovskite solar cells (PSCs) since they convert into heat easily and destroy the device stability. Establishing thermoelectric effect on the same PSCs is supposed to be an efficient way to convert heat into electricity. However, whether thermoelectric effect exists during the photovoltaic process has never been concerned. Herein, we report that the FAP-based PSCs operated under temperature differences (ΔT=15 oC) afford a champion PCE of 25.74%, higher than 22.84% with ΔT=0 oC, along with an improved Voc from 1.17 V to 1.23 V. It’s demonstrated that integrating photoelectric and thermoelectric effects can magnify the solar-to-electricity conversion. The critical factors to success are utilizing adequately photocarrier in parallel with regulating the intrinsic carrier directional transport and facilitating the charge carriers’ collection. The work shed light on the synergistic contribution of photoelectric and thermoelectric effect to efficient PSCs.