Li Meng of Henan University, together with Antonio Abate of the Helmholtz Centre for Materials and Energy in Germany, and other researchers observed the crystallisation dynamics of perovskite thin films and in-situ strain under hot and cold fatigue with the help of the in-situ glove box spin-coating device and in-situ temperature-variable device of the Shanghai Light Source Diffraction Line Station BL14B1, which provides an important basis for the stability of perovskite solar cells.