Gonzalez-Moya Johan R, Chang Chen-Yu, Radu Daniela R, Lai Cheng-Yu
Department of Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174, United States.
ACS Omega. 2022 Jul 21;7(30):26738-26748. doi: 10.1021/acsomega.2c03089. eCollection 2022 Aug 2.
Herein, we report the in situ photocatalytic deposition of cesium lead bromide (CsPbBr) perovskite quantum dots on mesoporous TiO-coated fluorine-doped tin oxide (FTO/TiO) electrodes. The mesoporous TiO layer is used as a photocatalyst to promote the following: (1) the Pb deposition from a Pb aqueous solution and (2) the in situ Pb conversion into CsPbBr perovskite in the presence of a CsBr methanolic solution without any organic capping agent. Both steps are carried out under ultraviolet light irradiation under ambient conditions without any post-treatment. The obtained FTO/TiO/CsPbBr film was characterized by UV-vis diffuse reflectance spectroscopy, X-ray diffraction, photoluminescence spectroscopy, scanning electron microscopy, and transmission electron microscopy. The FTO/TiO/CsPbBr heterojunction exhibited enhanced visible-light photodegradation activity demonstrated for the oxidation of curcumin organic dye as a model system. The novel and simple approach to fabricating a supported photocatalyst represents a scalable general method to use semiconductors as a platform to incorporate different perovskites, either all-inorganic or hybrid, for optoelectronic applications. The perovskite deposition method mediated by the UV light at room temperature could be further applied to flexible and wearable solar power electronics.
在此，我们报道了在介孔二氧化钛包覆的氟掺杂氧化锡（FTO/TiO）电极上原位光催化沉积溴化铯铅（CsPbBr）钙钛矿量子点。介孔TiO层用作光催化剂以促进以下过程：（1）从Pb水溶液中沉积Pb，以及（2）在没有任何有机封端剂的情况下，在CsBr甲醇溶液存在下将Pb原位转化为CsPbBr钙钛矿。这两个步骤均在环境条件下的紫外光照射下进行，无需任何后处理。通过紫外可见漫反射光谱、X射线衍射、光致发光光谱、扫描电子显微镜和透射电子显微镜对所得的FTO/TiO/CsPbBr薄膜进行了表征。FTO/TiO/CsPbBr异质结表现出增强的可见光光降解活性，以姜黄素有机染料的氧化作为模型体系进行了证明。这种制备负载型光催化剂的新颖且简单的方法代表了一种可扩展的通用方法，可将半导体用作平台来掺入不同的钙钛矿，无论是全无机还是混合钙钛矿，用于光电子应用。室温下由紫外光介导的钙钛矿沉积方法可进一步应用于柔性和可穿戴太阳能电子器件。
