Towards Perovskite Vapor Transport Deposition: PbI2 Deposition and Modeling in a Close Space Vapor Transport Configuration

摘要

Interactions between temperature, pressure, and deposition rate are explored for the deposition of PbI2 in a close space vapor transport (CSVT) geometry. The data presented here confirm that PbI2 deposition occurs through diffusive mass transport based on strong correlations between the deposition rate and PbI2 concentration gradient from the source and to the substrate. The calculated deposition rates from a one-dimensional diffusive mass transport model are found to be in good agreement with the experimentally-measured values. Additionally, the deposition temperature and pressure are found to strongly affect the morphology of equally-thick PbI2 films, where higher temperature produces a rougher morphology and higher pressure leads to a more open grain structure.