Reaction coordinate diagram of CsPbBr3crystal formation by thermal co-evaporation of CsBr and PbBr2. The released energy of the reaction between gaseousCsBr and PbBr2 molecules is calculated to be 385.8 kJ·mol−1, far beyond that of the reaction between solid-state CsBr and PbBr2 (28.9 kJ·mol−1).                 

一个值得思考的问题是，将一些固相反应变成气相反应，更容易发生。