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Orientation Regulation of One-Dimensional CsCu2I3 Perovskites for Visible-Blind Ultraviolet Photodetectors
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-07-11 , DOI: 10.1021/acs.jpclett.2c01715 Mingda Li 1 , Chensi Cao 1 , Wenbo Liu 1 , Nana Wang 1 , Chang Yi 1 , Renzhi Li 1 , Jianpu Wang 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-07-11 , DOI: 10.1021/acs.jpclett.2c01715 Mingda Li 1 , Chensi Cao 1 , Wenbo Liu 1 , Nana Wang 1 , Chang Yi 1 , Renzhi Li 1 , Jianpu Wang 1
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Ternary copper halides with a formula of CsCu2X3 (X = Cl, Br, I) have been considered as prospective materials for ultraviolet (UV) photodetectors, due to their suitable band gaps, environmental stability, eco-friendliness, and low cost. However, the crystal orientation of one-dimensional (1D) CsCu2X3 perovskites significantly affects the exciton/carrier transport in the films and thus the photodetector performance. Here, we tune the crystal orientation and exciton/charge transport of 1D CsCu2I3 perovskite films by using antisolvents during the film formation process. Compared to the randomly oriented film treated by ethyl acetate, the CsCu2I3 film using toluene as antisolvent exhibits preferential (221)-oriented growth, which induces enhanced vertical exciton diffusion/charge transport and suppressed nonradiative recombination. On the basis of this strategy, we demonstrate a self-powered, stable, and visible-blind UV photodetector with significantly enhanced response speed and detectivity. Our work clarifies that tuning the crystal orientation of 1D CsCu2X3 perovskites is the key to achieve efficient exciton diffusion/charge transport and thus high-performance lead-free perovskite optoelectronic devices.
中文翻译：
用于可见盲紫外光电探测器的一维 CsCu2I3 钙钛矿的取向调节
分子式为 CsCu 2 X 3 (X = Cl, Br, I)的三元卤化铜因其合适的带隙、环境稳定性、环保性和低成本而被认为是用于紫外 (UV) 光电探测器的潜在材料. 然而，一维（1D）CsCu 2 X 3钙钛矿的晶体取向显着影响薄膜中的激子/载流子传输，从而影响光电探测器的性能。在这里，我们通过在成膜过程中使用反溶剂来调整一维 CsCu 2 I 3钙钛矿薄膜的晶体取向和激子/电荷传输。与乙酸乙酯处理的无规取向薄膜相比，CsCu 2 I 3使用甲苯作为反溶剂的薄膜表现出优先的（221）取向生长，这会增强垂直激子扩散/电荷传输并抑制非辐射复合。在此策略的基础上，我们展示了一种自供电、稳定且可见盲的紫外光电探测器，其响应速度和检测率显着提高。我们的工作阐明了调整一维 CsCu 2 X 3钙钛矿的晶体取向是实现高效激子扩散/电荷传输以及高性能无铅钙钛矿光电器件的关键。
更新日期：2022-07-11
中文翻译：
用于可见盲紫外光电探测器的一维 CsCu2I3 钙钛矿的取向调节
分子式为 CsCu 2 X 3 (X = Cl, Br, I)的三元卤化铜因其合适的带隙、环境稳定性、环保性和低成本而被认为是用于紫外 (UV) 光电探测器的潜在材料. 然而，一维（1D）CsCu 2 X 3钙钛矿的晶体取向显着影响薄膜中的激子/载流子传输，从而影响光电探测器的性能。在这里，我们通过在成膜过程中使用反溶剂来调整一维 CsCu 2 I 3钙钛矿薄膜的晶体取向和激子/电荷传输。与乙酸乙酯处理的无规取向薄膜相比，CsCu 2 I 3使用甲苯作为反溶剂的薄膜表现出优先的（221）取向生长，这会增强垂直激子扩散/电荷传输并抑制非辐射复合。在此策略的基础上，我们展示了一种自供电、稳定且可见盲的紫外光电探测器，其响应速度和检测率显着提高。我们的工作阐明了调整一维 CsCu 2 X 3钙钛矿的晶体取向是实现高效激子扩散/电荷传输以及高性能无铅钙钛矿光电器件的关键。
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