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Photoelectrochemical solar cells including dye-sensitized solar cells(DSSCs)and perovskite solar cells(PSCs)have been drawing an ever-increasing interesting in these years.When solar cells are at work under the solar radiation,it is inevitable that the surface temperature of solar cells increases because of the heating effect of sunlight irradiation.On the other hand,because of irradiation differences on two sides of solar cells,a temperature difference would be caused between two sides of solar cells.For the thermoelectric materials,the temperature difference would generate a potential difference between the high-temperature side and the low-temperature side according to Seebeck effect.The potential difference within the materials may produce a built-in electric field,which is a common effective approach to improve the separation of photoinduced charge for solar cells and other photoelectric devices.We synthetized some thermoelectric-photoelectric composite materials and used them in photoelectrochemical solar cells.The effect of thermoelectric materials on the photovoltaic performance was investigated and an enhancing conversion efficiency was obtained in the solar cells by adding moderate thermoelectric oxides.Furthermore,by analyzing the effect of intentional temperature gradients on the properties of the solar cells,it was found that the photovoltaic performances of the devices with thermoelectric elements could be further enhanced by appropriate temperature difference.This work not only is significant for developing novel composite materials of photoelectrochemical solar cells with high performance,but also provides a new idea for utilization of multiple new energy technologies including photovoltaics and thermoelectricity.