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Highly Stable Perovskite Photodetector Based on VaporProcessed Micrometer-Scale CsPbBr3 Microplatelets Ying Li, Zhifeng Shi, Lingzhi Lei, Fei Zhang, Zhuangzhuang Ma, Di Wu, Tingting Xu, Yongtao Tian, Yuantao Zhang, Guotong Du, Chongxin Shan, and Xinjian Li Chem. Mater., Just Accepted Manuscript • DOI: 10.1021/acs.chemmater.8b02435 • Publication Date (Web): 18 Sep 2018 Downloaded from http://pubs.acs.org on September 18, 2018
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Chemistry of Materials
Highly Stable Perovskite Photodetector Based on VaporProcessed Micrometer-Scale CsPbBr3 Microplatelets Ying Li,1 Zhifeng Shi,*1,2 Lingzhi Lei,1 Fei Zhang,1 Zhuangzhuang Ma,1 Di Wu,1,2 Tingting Xu,1,2 Yongtao Tian,1,2 Yuantao Zhang,3 Guotong Du,3 Chongxin Shan,*1,2,4 and Xinjian Li*1,2 1
Department of Physics and Engineering, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China Key Laboratory of Materials Physics of Ministry of Education, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, China 3 State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Street 2699, Changchun 130012, China 4 State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China 2
ABSTRACT: Recently, the halide perovskites have attracted our tremendous attention because of their great abilities in large-scale and cost-effective manufacturing in optoelectronic devices. Here, a novel photodetector configuration was proposed by employing vapor-processed micrometer-scale inorganic CsPbBr3 microplatelets as the light absorber. Temperature-dependent steady-state and time-resolved photoluminescence spectrum were firstly performed to study the emission mechanisms and carrier recombination dynamics of the CsPbBr3 microplatelets. Further, a photoconductive detector was prepared, and the device exhibits good performances with a high on/off photocurrent ratio of 4.6×103, a responsivity of ~1.33 A/W, and a specific detectivity of 0.86×1012 Jones. Additionally, temperature-dependent currentvoltage and current-time characteristics of the photodetector were studied to assess the thermal effects on its photodetection ability. In particular, the unencapsulated photodetector demonstrates a prominent stability over the longterm temperature endurance measure in air ambient. Even operated at 373 K, the photodetector can operate properly, showing a high temperature resistance. Moreover, the device performance can almost be retained even with a 7-month storage in air. The experimental results obtained above suggest that the CsPbBr3 microplatelets can serve as a good candidate for the fabrication of high-performance photodetectors compatibility for practical applications.
INTRODUCTION Recently, the metal halide perovskites have triggered an increasingly intensive concern owing to their remarkable characteristics including direct bandgap, tunable emission wavelength, high light absorption coefficient, simple processing technique, and high and well-balanced carrier transport ability.1−10 These unique features render such perovskite materials promising candidates for optoelectronic device applications such as photovoltaic cells,11,12 luminescent devices,13−16 lasing,17−19 and 4,20−24 photodetectors. However, the study on photodetectors is still short of important breakthrough that can promote perovskite-based photodetectors into the practical applications, which is mainly because of the difficulty in preparing high-quality perovskite light absorbers with a good compactness and a good crystallinity, and also the undesired hypersensitivity of perovskites in air with moisture. We all know that when
organic-inorganic hybrid perovskites are exposed to air ambient, it suffer a deterioration rapidly. But inorganic perovskites CsPbX3 show remarkable stability except for all the superior characteristics inherited from the organicinorganic perovskites, and many reports have argued that CsPbX3 has a high thermal stability until its melting at ~500 °C.25 Thus, as the alternatives, inorganic perovskites are beginning to draw many scientific attention in reliable photodetector fabrication.26−31 For instance, Chen et al. demonstrated a simple photodetector using the horizontal single-crystal CsPbX3 nanowires with controlled crystallographic orientations as the light absorber, showing an on/off photocurrent ratio of 103 and a response time of
