DOI: https://doi.org/10.29363/nanoge.hybridoe.2021.009
Publication date: 3rd December 2021
Understanding and regulating the crystallization behavior of quasi-2D perovskite is the key to obtain high quality perovskite thin films. This report will firstly discuss the heterogeneous nucleation, orientated growth, tuned crystal growth rate of quasi-2D perovskites. And then we will introduce our recent advances in healing the buried cavities and defects in quasi-2D Perovskite films by a self-generated methylamine gas method. When quasi-two-dimensional RP perovskite films, which adopt a downward growth mode, possess large grain size, it is found that defective contacts tend to be formed at their bottom interfaces together with many nanocavities. This is attributed to the angular growing fronts of RP perovskite grains which adopt [111] (or/and [101]) growth direction. Herein, a self-generated methylamine gas, by a replacement reaction in precursor solution, is developed to in-situly heal the bottom interfacial nanocavities during the crystallization process. The amount of self-generated methylamine gas can be adequately controlled to avoid homogenous nucleation of perovskite phase from the liquid perovskite-amine intermediate phase, which is a key to healing the buried irregular cavities deep in the perovskite layer without ruining the large grains and composition of the RP perovskites. As a consequence, this interfacial-defect healing strategy enables efficient hole extraction as well as improved interfacial adhesion, providing significantly enhanced efficiency and stability in RP perovskite solar cells.
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