Hefei Research Institute Makes Progress in Perovskite Solar Cell Research
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SEM profile of perovskite solar cells (a) and JV curve (b)
Recently, the research team of Ye Changhui, a researcher at the Department of Micro-nano Technology and Devices of the Institute of Solid State Physics, Chinese Academy of Sciences, has made new progress in perovskite solar cell research. The relevant results were published in the Journal of Materials Chemistry of the Royal Society of Chemistry in the UK. (J. Mater. Chem. A, 2015, 3, 14902-14909).
Perovskite solar cells have high photoelectric conversion efficiency and low preparation cost, and have become a research hotspot in the field of solar cells. While gaining high photoelectric conversion efficiency, researchers continue to explore new methods to further reduce the cost of manufacturing battery devices.
Simplifying the internal device structure of the perovskite solar cell and shortening the manufacturing process flow of the battery device is an effective method for reducing its cost. In addition, simplifying the structure of the battery device can effectively reveal the working mechanism of the photovoltaic cell. The basic structure of a perovskite solar cell includes a mesoporous framework layer, a perovskite photovoltaic active layer, and a hole transport layer.
However, the material of the hole-transport layer is usually composed of organic polymer chemicals such as spiro-OMeTAD and arylamine derivatives, and the preparation process is complicated and expensive, and the perovskite solar is limited. The industrialization process of the battery; In addition, the mesoporous framework layer preparation method is complex, and the structural uniformity is poor. Simplifying the structure of the perovskite solar cell, and at the same time deepening the working mechanism of the battery device, has a positive significance for the practical application of the perovskite battery.
The research group Liu Ying et al. developed a perovskite solar cell with a simple structure, no hole-transporting layer, and a mesoporous framework layer (Fig. a) with a photoelectric conversion efficiency of more than 10% (Fig. b). The CH3NH3PbI3 perovskite film prepared by this method has the advantages of high quality, simple process, and repeatability. The working mechanism of the battery device found that a built-in electric field is formed between the TiO2 dense hole blocking layer and CH3NH3PbI3, which is conducive to the export of the optical carriers to the external circuit, and also can effectively suppress the backflow and recombination of the photo-generated electrons, ensuring the battery's Normal work and high photoelectric conversion efficiency.
The above research was funded by the National Major Scientific Research Program, the National Natural Science Foundation, and the International Innovation Team Project of the Chinese Academy of Sciences.
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