Shenzhen Advanced Institute made new progress in the research of black phosphorus photovoltaic devices
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Fig. (top left) Photographs and transmission electron micrographs of black phosphorus quantum dots; (top right) cell photocathode structure diagram; (bottom left) polyaniline/black phosphorescent cathode and TiO2 photoanode absorption spectra; (bottom right) based on black phosphorescent cathode Quasi-solid dye-sensitized solar cell photoelectric performance curve.
Recently, researcher Yu Xuefeng of the Institute of Advanced Technology of the Chinese Academy of Sciences Shenzhen Institute of Technology and Associate Professor Yang Ying of the School of Metallurgy and Environment of Central South University and Associate Professor Xiao Si of the School of Physics and Electronics have made progress in the application of black phosphorus photovoltaic devices. Related papers based on black phosphorus quantum dots based on photocathodes in wideband bifacial dye-sensitized solar cells are published online in Advanced Materials.
Black phosphorus, as a direct bandgap semiconductor material with a two-dimensional layered structure, exhibits excellent optical and electrical properties and is widely regarded as a new "supermaterial" in the semiconductor industry, optoelectronic devices, optical detection, and biology. Many fields such as medicine show great potential application value. The research team innovatively applied black phosphorus quantum dots, which were only a few nanometers in size, to the photocathode of dye-sensitized solar cells. Dye-sensitized solar cells have the advantages of low cost, simple process, and environmental friendliness. The primary way to achieve high conversion efficiency of solar cells is to increase the utilization of sunlight as much as possible.
The team used the near-infrared strong absorption and high photoelectric conversion capability of the black phosphorus quantum dots to deposit the black phosphorus quantum dots on the surface of the porous conductive polyaniline film to prepare an infrared photoresponsive photocathode, which forms a complementary light absorption with the photoanode. The device's light absorption range is extended to the visible-infrared waveband, thereby assembling a quasi-solid dye-sensitized solar cell that can be double-sided into light. The battery performance test results show that after deposition of the black phosphorus quantum dots, the photocathode achieves full use of low-energy infrared photons and effectively increases the photocarrier concentration of the device, thereby increasing the photoelectric conversion efficiency of the solar cell by 20%. The research results show that black phosphorus quantum dots have great application potential in solar cells, photovoltaic devices and other fields.
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