In recent years, the all-inorganic perovskite light absorbing material represented by CsPbI3 has excellent thermal and photoelectric stability, and its 1.7 eV band gap is an ideal choice for high-efficiency perovskite/silicon tandem solar cells. All-inorganic CsPbI3 perovskite solar cells have become a new research hotspot in new thin-film solar cells. At present, the defect density of the all-inorganic CsPbI3 perovskite absorption layer is relatively high, and the non-radiative charge recombination makes the battery open circuit voltage loss larger, resulting in low battery efficiency. Improving the crystalline quality of the film to reduce its defect density is of great significance for further improving the performance of this type of device.
Based on this, the Meng Qingbo team (group E02), a researcher at the Clean Energy Laboratory of the Institute of Physics, Chinese Academy of Sciences/Beijing National Research Center for Condensed Matter Physics, developed a series of bulk and interface control methods for the preparation of high-quality all-inorganic perovskite films, and then Obtained high-performance solar cells and made a series of research progress. For example, the use of solvent engineering methods to prepare efficient and stable all-inorganic hybrid halogen perovskite solar cells (J. Mater. Chem. A, 2018, 6, 19810); the use of inorganic ammonium halide additive coordination strategy to prepare efficient and stable all-inorganic CsPbI3 Perovskite solar cells (Adv. Funct. Mater. 2021, 31, 2010813).
Recently, the scientific research team developed a urea-ammonium thiocyanate (UAT) molten salt control strategy for the all-inorganic CsPbI3 perovskite solar cell. Research to fully release and utilize the coordination activity of SCN-roots, prepare high crystalline quality CsPbI3 thin films, and obtain efficient and stable all-inorganic perovskite solar cells. Among them, UAT is synthesized by the hydrogen bond interaction between NH4+ in NH4SCN and urea. Studies have found that the introduction of UAT can significantly improve the crystalline quality of CsPbI3 films, and film defects and non-radiative charge recombination are significantly suppressed. The efficiency of the all-inorganic perovskite solar cell is increased to more than 20%. The device prepared based on this method has excellent working stability, and no performance degradation is seen for 1000 hours of continuous operation under stable light and constant bias voltage.
On this basis, the scientific research team further increased the efficiency of the all-inorganic CsPbI3 solar cell to more than 21%, and obtained a third-party certification efficiency of 20.1%, both of which are currently the highest values ​​of the all-inorganic perovskite solar cell system. The above research has laid the foundation for the further industrial development of CsPbI3 all-inorganic perovskite battery/silicon tandem solar battery.
Relevant research results are titled Efficient (> 20%) and Stable All-Inorganic Cesium Lead Triiodide Solar Cell Enabled by Thiocyanate Molten Salts 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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Figure 1. Explanation of the crystallization mechanism of CsPbI3 film controlled by UAT: (a) Schematic diagram of the cation structure of UAT with different synthesis ratios; (b) Schematic diagram of perovskite grain growth and atomic interaction
Figure 2. Solar cell performance characterization: (a) the current-voltage characteristic curve of the best battery device; (b) the external quantum efficiency of the best battery device; (c) the steady-state efficiency test of the best battery device; (d) the most Stability test of the best battery device for 1000 hours of continuous work; (e) Environmental stability test result of the best device (unpackaged)
Figure 3. The latest progress of Meng Qingbo's team in all-inorganic perovskite solar cells and the successively obtained all-inorganic battery certification efficiency
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