title: Passivated Single-Crystalline CH3NH3PbI3Nanowire Photodetector with High Detectivity and Polarization Sensitivity.
abstract: Photodetectors convert light signals into current or voltage outputs and are widely used for imaging, sensing, and spectroscopy. Perovskite-based photodetectors have shown high sensitivity and fast response due to the unprecedented low recombination loss in this solution processed semiconductor. Among various types of CH3NH3PbI3morphology (film, single crystal, nanowire), single-crystalline CH3NH3PbI3nanowires are particularly interesting for photodetection because of their reduced grain boundary, morphological anisotropy, and excellent mechanical flexibility. The concomitant disadvantage associated with the CH3NH3PbI3nanowire photodetectors is their large surface area, which catalyzes carrier recombination and material decomposition, thus significantly degrading device performance and stability. Here we solved this key problem by introducing oleic acid soaking to passivate surface defects of CH3NH3PbI3nanowires, which leads to a device with much improved stability and unprecedented sensitivity (measured detectivity of 2 × 1013Jones). By taking advantage of their one-dimensional geometry, we also showcased, for the first time, the linear dichroic photodetection of our CH3NH3PbI3nanowire photodetector.
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Liang
authors: L
authors: Gao
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Kai
authors: K
authors: Zeng
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Jingshu
authors: J
authors: Guo
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Cong
authors: C
authors: Ge
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Jing
authors: J
authors: Du
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Yang
authors: Y
authors: Zhao
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Chao
authors: C
authors: Chen
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Hui
authors: H
authors: Deng
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Yisu
authors: Y
authors: He
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Haisheng
authors: H
authors: Song
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Guangda
authors: G
authors: Niu
authors: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST) , Wuhan 430074, China.
authors: Jiang
authors: J
authors: Tang
keywords: Single-crystalline CH3NH3PbI3 nanowire; high detectivity; passivation; polarization sensitivity