title: Improving All-Inorganic Perovskite Photodetectors by Preferred Orientation and Plasmonic Effect.
abstract: All-inorganic perovskites have high carrier mobility, long carrier diffusion length, excellent visible light absorption, and well overlapping with localized surface plasmon resonance (LSPR) of noble metal nanocrystals (NCs). The high-performance photodetectors can be constructed by means of the intrinsic outstanding photoelectric properties, especially plasma coupling. Here, for the first time, inorganic perovskite photodetectors are demonstrated with synergetic effect of preferred-orientation film and plasmonic with both high performance and solution process virtues, evidenced by 238% plasmonic enhancement factor and 106on/off ratio. The CsPbBr3and Au NC inks are assembled into high-quality films by centrifugal-casting and spin-coating, respectively, which lead to the low cost and solution-processed photodetectors. The remarkable near-field enhancement effect induced by the coupling between Au LSPR and CsPbBr3photogenerated carriers is revealed by finite-difference time-domain simulations. The photodetector exhibits a light on/off ratio of more than 106under 532 nm laser illumination of 4.65 mW cm-2. The photocurrent increases from 0.67 to 2.77 μA with centrifugal-casting. Moreover, the photocurrent rises from 245.6 to 831.1 μA with Au NCs plasma enhancement, leading to an enhancement factor of 238%, which is the most optimal report among the LSPR-enhanced photodetectors, to the best of our knowledge. The results of this study suggest that all-inorganic perovskites are promising semiconductors for high-performance solution-processed photodetectors, which can be further enhanced by Au plasmonic effect, and hence have huge potentials in optical communication, safety monitoring, and biological sensing.
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Dong
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Gu
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Yousheng
authors.initials: Y
authors.lastname: Zou
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China. songjizhong@njust.edu.cn.
authors.forename: Jizhong
authors.initials: J
authors.lastname: Song
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Leimeng
authors.initials: L
authors.lastname: Xu
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Jianhai
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Xue
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Optoelectronics & Nanomaterials, Herbert Gleiter Institute of Nanoscience, Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China. zeng.haibo@njust.edu.cn.
authors.forename: Haibo
authors.initials: H
authors.lastname: Zeng
keywords: all-inorganic perovskites; localized surface plasmon resonance; nanocrystals (NCs); perovskite; photodetectors; preferred orientation