@article{Ma2017, 
author = {Dewei Ma and Yongping Fu and Lianna Dang and Jianyuan Zhai and Ilia A. Guzei and Song Jin},
title = {Single-crystal microplates of two-dimensional organic–inorganic lead halide layered perovskites for optoelectronics},
year = {2017},
journal = {Nano Research},
volume = {10},
number = {6},
pages = {2117-2129},
keywords = {photoluminescence, nanoplate, layered lead-halide perovskite, phenylethylammonium lead-halide perovskites, microplate, dissolution–recrystallization},
url = {https://www.sciopen.com/article/10.1007/s12274-016-1401-6},
doi = {10.1007/s12274-016-1401-6},
abstract = {Organic–inorganic hybrid perovskites attract considerable attention owing to their applications in high-efficiency solar cells and light emission. Compared with three-dimensional perovskites, two-dimensional (2D) layered hybrid perovskites have a higher exciton binding energy and potentially higher light-emission efficiency. The growth of high-quality crystalline 2D perovskites with a well-defined nanoscale morphology is desirable because they can be suitable building blocks for integrated optoelectronics and (nano)photonics. Herein, we report the facile solution growth of single-crystal microplates of 2D perovskites based on a 2-phenylethylammonium (C6H5CH2CH2NH3+, PEA) cation, (PEA)2PbX4 (X = Br, I), with a well-defined rectangular geometry and nanoscale thickness through a dissolution–recrystallization process. The crystal structures of (PEA)2PbX4 are first confirmed using single-crystal X-ray diffraction. A solution-phase transport-growth process is developed to grow microplates with a typical size of tens of micrometers and thickness of hundreds of nanometers on another clean substrate different from the substrate coated with lead-acetate precursor film. Surface-topography analysis suggests that the formation of the 2D microplates is likely driven by the wedding-cake growth mechanism. Through halide alloying, the photoluminescence emission of (PEA)2Pb(Br, I)4 perovskites with a narrow peak bandwidth is readily tuned from violet (~410 nm) to green (~530 nm).}
}