Unraveling the Growth of Hierarchical Quasi-2D/3D Perovskite and Carrier Dynamics

Liang Li, Ning Zhou, Qi Chen, Qiuyu Shang, Qing Zhang, Xindong Wang, Huanping Zhou*

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摘要

The construction of hybrid perovskites (both two-dimensional (2D) and three-dimensional (3D)) has attracted intensive research interest recently. Here, a facile, two-step consecutive deposition method was developed for the first time to grow a hierarchical quasi-2D/3D perovskite superstructure, with an oriented quasi-2D ((BA)2(MA)-rfnet-1PbnI3n+1) perovskite nanosheet (NS) perpendicularly aligned on 3D perovskites. The superstructures are found to be mixtures of multiple perovskite phases, with n = 2, 3, 4 and 3D perovskite; however, the n value was naturally increased from top to the bottom, which is distinct from many other works. We found that the concentration gradient, namely, the initial ratio and amount of BAI/MAI, collectively contributes to the spatially confined nucleation and growth of oriented quasi-2D superstructure perovskite on 3D perovskites. An efficient charge carrier transfer was demonstrated from small-n to large-n phases in this perovskite superstructure, indicating a different type of energy funnel from top to bottom.

源语言英语
页(从-至)1124-1132
页数9
期刊Journal of Physical Chemistry Letters
9
5
DOI
出版状态已出版 - 1 3月 2018

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Li, L., Zhou, N., Chen, Q., Shang, Q., Zhang, Q., Wang, X., & Zhou, H. (2018). Unraveling the Growth of Hierarchical Quasi-2D/3D Perovskite and Carrier Dynamics. Journal of Physical Chemistry Letters, 9(5), 1124-1132. https://doi.org/10.1021/acs.jpclett.7b03294