Catalyst‐Free and Morphology‐Controlled Growth of 2D Perovskite Nanowires for Polarized Light Detection
Catalyst‐Free and Morphology‐Controlled Growth of 2D Perovskite Nanowires for Polarized Light Detection
复制标题
DOI：
10.1002/adom.201900039
复制
发表时间：
2019-05
影响因子：
9
通讯作者：
Debjit Ghoshal;Tianmeng Wang;H. Tsai;Shangjiang Chang;M. Crommie;N. Koratkar;Sufei Shi
中科院分区：
文献类型：
--
作者：
Debjit Ghoshal;Tianmeng Wang;H. Tsai;Shangjiang Chang;M. Crommie;N. Koratkar;Sufei Shi
Ruddleson-Popper （RP）钙钛矿作为一类继承了钙钛矿和二维材料两种材料优越的光电性能的材料而出现。大的激子结合能和天然的量子阱结构不仅使这些材料成为研究光-物质相互作用的理想平台，而且使它们适合于制造各种功能光电器件。纳米结构和形态控制使得半导体具有增强的功能。半导体材料的纳米线广泛应用于激光和传感等重要应用。然而，无催化剂和模板的二维钙钛矿纳米线的可扩展生长仍然是难以捉摸的。本文展示了一种简单的二维钙钛矿（BA）2PbI4纳米线形貌控制生长的方法。此外，该纳米线的光致发光（PL）是高度极化的，其极化比高达≈0.73，这是钙钛矿中最大的极化比之一。研究进一步表明，来自混合纳米线/石墨烯器件的光电流对入射光的偏振也很敏感，其光电流各向异性比为≈3.62（远远大于之前报道的钙钛矿的2.68），从而证明了这些纳米线作为高效偏振光光电探测器的潜力。
Ruddleson–Popper (RP) perovskites have emerged as a class of material inheriting the superior optoelectronic properties of two materials: perovskites and 2D materials. The large exciton binding energy and natural quantum well structure not only make these materials ideal platforms to study light–matter interactions but also render them suitable for fabrication of various functional optoelectronic devices. Nanoscale structuring and morphology control have led to semiconductors with enhanced functionalities. Nanowires of semiconducting materials are extensively used for important applications like lasing and sensing. However, catalyst and template‐free scalable growth of nanowires of 2D perovskites has remained elusive. In this paper, a facile approach for morphology‐controlled growth of nanowires of 2D perovskite, (BA)2PbI4, is demonstrated. Additionally, it is shown that the photoluminescence (PL) from the nanowires is highly polarized with a polarization ratio as large as ≈0.73, which is one of the largest reported for perovskites. It is further shown that the photocurrent from the hybrid nanowire/graphene device is also sensitive to the polarization of the incident light with the photocurrent anisotropy ratio of ≈3.62 (much larger than the previously reported value of 2.68 for perovskites), thus demonstrating the potential of these nanowires as highly efficient photodetectors for polarized light.