Critical Intermediate Structure That Directs the Crystalline Texture and Surface Morphology of Organo-Lead Trihalide Perovskite
Journal
ACS Applied Materials and Interfaces
Journal Volume
9
Journal Issue
42
Pages
36897-36906
Date Issued
2017
Author(s)
Chia H.-C.
Sheu H.-S.
Hsiao Y.-Y.
Li S.-S.
Lan Y.-K.
Lin C.-Y.
Chang J.-W.
Kuo Y.-C.
Chen C.-H.
Weng S.-C.
Su C.-J.
Su A.-C.
Jeng U.-S.
Abstract
I layers. Such intermediate structure reveals a hidden correlation between the intermediate phase and the composition of the processing solution. Most importantly, the 2D perovskite lattice of the intermediate phase is largely crystallographically aligned with the [110] planes of the three-dimensional perovskite cubic phase; consequently, with sublimation of Cl ions from the organo-lead octahedral terminal corners in prolonged annealing, the zigzagged octahedral layers of the intermediate phase can merge with the intercalated methylammonium iodide layers for templated growth of perovskite crystals. Regulated by annealing temperature and the activation energies of the intermediate and perovskite, deduced from analysis of temperature-dependent structural kinetics, the intermediate phase is found to selectively mature first and then melt along the layering direction for epitaxial conversion into perovskite crystals. The unveiled epitaxial conversion under growth kinetics controls might be general for solution-processed and intermediate-templated perovskite formation.
SDGs
Publisher
American Chemical Society
Type
journal article