Atomically thin two-dimensional organic-inorganic hybrid perovskites

作者：Letian Dou, Andrew Barnabas Wong, Yi Yu, Minliang Lai, Nikolay Kornienko, Samuel W. Eaton, Anthony Fu, Connor G. Bischak, Jie Ma, Tina X. Ding, Naomi S. Ginsberg, Lin‐Wang Wang, A. Paul Alivisatos, Peidong Yang · 发表于：Science · 年份：2015 · 被引用次数：1379 · 研究领域：Perovskite Materials and Applications、2D Materials and Applications、Quantum Dots Synthesis And Properties

Organic-inorganic hybrid perovskites, which have proved to be promising semiconductor materials for photovoltaic applications, have been made into atomically thin two-dimensional (2D) sheets. We report the solution-phase growth of single- and few-unit-cell-thick single-crystalline 2D hybrid perovskites of (C4H9NH3)2PbBr4 with well-defined square shape and large size. In contrast to other 2D materials, the hybrid perovskite sheets exhibit an unusual structural relaxation, and this structural change leads to a band gap shift as compared to the bulk crystal. The high-quality 2D crystals exhibit efficient photoluminescence, and color tuning could be achieved by changing sheet thickness as well as composition via the synthesis of related materials.