title: Constructing Fast Carrier Tracks into Flexible Perovskite Photodetectors To Greatly Improve Responsivity.
abstract: Intrinsically high mobility and large absorption coefficient endow inorganic halide perovskites (IHPs) with great promise for high-performance photodetectors (PDs), which, however, are being hindered by the low carrier extraction and transport efficiency of the solution assembled films. Here, we report on a general strategy to enhance the perovskite film conductivity that carbon nanotubes (CNTs) conductive nanonets are constructed from to provide fast carrier tracks. Resultantly, the CsPbBr3nanosheet/CNT composite films exhibit both high light harvesting and high conductivity, such advantages are demonstrated by the high performances of corresponding planar PDs. Specifically, the highest external quantum efficiency (EQE) of 7488% and the highest responsivity of 31.1 A W-1under a bias of 10 V among IHP PDs with planar structure are achieved, which are almost 125-fold over the previous best results. Besides, the efficient charge extraction and transport also remarkably contribute to the fast response speed where a rise time of 16 μs is achieved, which is also superior to state-of-the-art IHP PDs. Furthermore, the composite films exhibit impressive flexibility due to the ultrathin 2D and 1D structural characteristic of perovskites and CNTs. By deploying the PD as a point-like detector, we acquire clear images. The results indicate the promising potentials of the perovskite/CNT composites for solution and ambient condition processed flexible devices, and this strategy is general for all kinds of perovskite optoelectronic devices including photodetectors, phototransistors, and even LEDs.
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.|State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Li
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Dejian
authors.initials: D
authors.lastname: Yu
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Cao
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wei
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Wu
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Sun
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Jianping
authors.initials: J
authors.lastname: Ji
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
authors.forename: Yalong
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore.
authors.forename: Handong
authors.initials: H
authors.lastname: Sun
authors.affiliation: MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.|State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Materials science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, China.
authors.forename: Haibo
authors.identifier: 0000-0002-7132-8885
authors.initials: H
authors.lastname: Zeng
keywords: carbon nanotube; fast carrier channel; perovskite; photodetector; two-dimensional