The research uses high-energy synchrotron radiation technology to track the phase transition behavior in the process of forming solid-state thin films by real-time tracking of the solution of two-dimensional perovskite precursors. The substrate temperature and solvent properties are studied for the two-dimensional perovskite crystallization kinetics. Phase purity, alignment of quantum wells, and the influence of photovoltaic performance. The researchers found that the orderliness of the two-dimensional perovskite phase purity and crystal orientation was reduced, mainly due to the formation of the intermediate state of the former 'driver-solvent'. The perovskite nucleation barrier is increased. Therefore, the nucleation and growth of the two-dimensional perovskite by the substrate is the key to the formation of high-quality perovskite films. The researchers used basal-induced crystallization to suppress the precursors. The formation of the solvent's intermediate state promotes the vertical orientation of the two-dimensional quantum wells, which makes them more thermodynamically stable, and further improves the purity of the crystal phase. Since the high-quality perovskite films can greatly improve the photoelectric conversion efficiency of solar cells, Therefore, this study provides a theoretical basis for the preparation of high-quality low-dimensional perovskite thin films and high-performance optoelectronic devices, which will help further promote perovskite solar cells. Application to the business.
The above research work was supported by the National Key R&D Program, the National Natural Science Foundation, the Central University Fund, the Ministry of Education '111 Introduction Program', the 'Thousand Person Project' project and Cornell University's high-energy synchrotron radiation source.
