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Research progress of all inorganic perovskite solar cells

Research progress of all inorganic perovskite solar cells


Source: Institute of physics update time: 2021-07-16 10:19:01

   in recent years, the all inorganic perovskite light absorption materials represented by cspbi3 have excellent thermal stability and photoelectric stability, and its 1.7 EV band gap is an ideal choice for high efficiency perovskite / silicon laminated solar cells. All inorganic cspbi3 perovskite solar cells have become a new research hotspot of new thin film solar cells. At present, the defect density of all inorganic cspbi3 perovskite absorption layer is relatively high, and the combination of non radiative charges makes the open circuit voltage loss of the battery larger, resulting in the low efficiency of the battery. Improving the crystalline quality of thin films to reduce the defect density is of great significance for further improving the performance of such devices.

   based on this, Meng Qingbo team (Group E02), researcher of clean energy laboratory, Institute of physics, Chinese Academy of Sciences / Beijing National Research Center for condensed matter physics, developed a series of bulk and interface control methods to prepare high-quality all inorganic Perovskite Thin Films and obtain high-performance solar cells, and made a series of research progress. For example, efficient and stable all inorganic mixed halogen perovskite solar cells (J. mater. Chem. A, 2018, 6, 19810) were prepared by solvent engineering method; Highly efficient and stable all inorganic cspbi3 perovskite solar cells (adv. function. Mater. 2021, 31, 2010813) were prepared by the coordination strategy of inorganic ammonium halide additives.

   recently, the research team developed a urea ammonium thiocyanate (UAT) molten salt control strategy for all inorganic cspbi3 perovskite solar cells. High quality cspbi3 thin films were prepared by fully releasing and utilizing the coordination activity of SCN radical, and then all inorganic perovskite solar cells with high efficiency and stability were obtained. UAT was synthesized by the hydrogen bond interaction between NH4 + and urea in NH4SCN. It is found that the introduction of UAT can significantly improve the crystalline quality of cspbi3 films, and the defects and non radiative charge recombination of the films are significantly inhibited. The efficiency of all inorganic perovskite solar cells is increased to more than 20%. The device based on this method has excellent stability, and it can work continuously for 1000 hours under stable illumination and constant bias without any performance degradation.

   on this basis, the research team further improved the efficiency of all inorganic cspbi3 solar cells to more than 21%, and obtained the third-party certification efficiency of 20.1%, both of which are the highest values of all inorganic perovskite solar cells. The above research laid a foundation for the further industrial development of cspbi3 all inorganic perovskite / silicon laminated solar cells.

   the related research results are titled efficient (> 20%) and stable all inorganic cell lead triiodide solar cell enabled by thiocyanate molten sales, and published in Angewandte Chemie International Edition. The research work is supported by the National Natural Science Foundation of China and the Ministry of science and technology.

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