水介质中丝阵脉冲放电冲击相变铯铅溴钙钛矿研究

Perovskite is regarded as one potential material for next-generation photovoltaic devices owing to its outstanding photoelectric characteristics which can be easily adjusted by phase transitions. However, the technology for intercepting and preparing the metastable perovskites is still in its infancy. The impact loading method has a significant advantage of high quenching rate,and enables the capture of metastable phases and facilitating their subsequent recovery and preparation. To achieve the impact phase transition treatment of CsPbBr₃,the cylindrical converging shockwaves are generated by the pulsed discharge of cylindrical wire array in water medium for studying the shock-induced phase transition of CsPbBr₃. The delicate control of shock pressure is applied to act on CsPbBr₃ powder by adjusting the charging voltage. After experiments,the samples are recovered and characterized. The characterized results reveale that the shock waves generated by pulsed discharge can induce phase transition in CsPbBr₃ powder under appropriate shock pressures (above 2 GPa). Additionally, the typical phenomena such as grain refinement,lattice distortion and nano-defects are observed in the recovered samples after shock-wave treatment. This study demonstrates that pulsed discharge of cylindrical wire array in water medium is a feasible converging shock wave loading technique,providing a novel approach to shock-induced phase transition loading.