Enhancing the photo-luminescence stability of CH_(3)NH_(3)PbI_(3) film with ionic liquids  

作　　者：Weifeng Ma Chunjie Ding Nasrullah Wazir Xianshuang Wang Denan Kong An Li Bingsuo Zou Ruibin Liu 马威峰;丁春杰;Nasrullah Wazir;王宪双;孔德男;李安;邹炳锁;刘瑞斌(Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics,Beijing Institute of Technology,Bejing 100081,China)

机构地区：[1]Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics,Beijing Institute of Technology,Bejing 100081,China

出　　处：《Chinese Physics B》2022年第3期550-554,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China (Grant No. 2018YFC2001100);the Natural National Science Foundation of China (Grant No. 61574017);the Fundamental Research Funds for Central Universities, China (Grant No. 2017CX10007);the Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University (Grant No. 2020GXYSOF08)。

摘　　要：The methylammonium lead triiodide(CH_(3)NH_(3)PbI_(3))-based perovskite shows a great alluring prospect in areas of solar cells, lasers, photodetectors, and light emitting diodes owing to their excellent optical and electrical advantages. However,it is very sensitive to the surrounding oxygen and moisture, which limits its development seriously. It is urgent to spare no effort to enhance its optical and electrical stability for further application. In this paper, we synthesize the MAPbI_(3) perovskite film on the glass substrate with/without the ionic liquid(IL) of 1-Butyl-3-methylimidazolium tetrafluoroborate(BMIMBF_(4)) by a simple two-step sequential solution method. The additive of BMIMBF_(4)can improve the quality of crystal structure. Moreover, the photo-luminescence(PL) intensity of MAPbI_(3) film with BMIMBF_(4) is much stronger than the pure MAPbI_(3) film after a week in the air, which is almost ten-fold of the pure one. Meanwhile, under the illumination of 405-nm continuous wave(CW) laser, the fluorescent duration of the MAPbI_(3) film with BMIMBF_(4) is approximately 2.75 min, while the pure MAPbI;film is only about 6 s. In fact, ionic liquid of BMIMBF_(4) in the perovskite film plays a role of passivation, which prevents the dissolution of MAPbI_(3) into CH_(3)NH_(3)and PbI_(2) and thus enhances the stability of environment. In addition, the ionic liquid of BMIMBF;possesses high ionic conductivity, which accelerates the electron transport, so it is beneficial for the perovskite film in the areas of solar cells, photodetectors, and lasers. This interesting experiment provides a promising way to develop the perovskite’s further application.

关 键 词：CH_(3)NH_(3)PbI_(3)perovskite film PHOTO-LUMINESCENCE BMIMBF_(4)ionic liquid 

分 类 号：TB383.2[一般工业技术—材料科学与工程]