| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Enhancing the photo-luminescence stability of CH3NH3PbI3 film with ionic liquids |
| Weifeng Ma(马威峰), Chunjie Ding(丁春杰), Nasrullah Wazir, Xianshuang Wang(王宪双), Denan Kong(孔德男), An Li(李安), Bingsuo Zou(邹炳锁), and Ruibin Liu(刘瑞斌)† |
| Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract The methylammonium lead triiodide (CH3NH3PbI3)-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 MAPbI3 perovskite film on the glass substrate with/without the ionic liquid (IL) of 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) by a simple two-step sequential solution method. The additive of BMIMBF4 can improve the quality of crystal structure. Moreover, the photo-luminescence (PL) intensity of MAPbI3 film with BMIMBF4 is much stronger than the pure MAPbI3 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 MAPbI3 film with BMIMBF4 is approximately 2.75 min, while the pure MAPbI3 film is only about 6 s. In fact, ionic liquid of BMIMBF4 in the perovskite film plays a role of passivation, which prevents the dissolution of MAPbI3 into CH3NH3 and PbI2 and thus enhances the stability of environment. In addition, the ionic liquid of BMIMBF4 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.
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Received: 13 August 2021
Revised: 07 October 2021
Accepted manuscript online: 18 October 2021
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PACS:
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78.55.-m
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(Photoluminescence, properties and materials)
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78.68.+m
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(Optical properties of surfaces)
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78.66.Sq
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(Composite materials)
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| Fund: 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), and the Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University (Grant No. 2020GXYSOF08). |
Corresponding Authors:
Ruibin Liu
E-mail: liusir@bit.edu.cn
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Cite this article:
Weifeng Ma(马威峰), Chunjie Ding(丁春杰), Nasrullah Wazir, Xianshuang Wang(王宪双), Denan Kong(孔德男), An Li(李安), Bingsuo Zou(邹炳锁), and Ruibin Liu(刘瑞斌) Enhancing the photo-luminescence stability of CH3NH3PbI3 film with ionic liquids 2022 Chin. Phys. B 31 037802
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