High-Switching-Ratio Photodetectors Based on Perovskite CH?NH?PbI? Nanowires.

ABSTRACT: Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH?NH?PbI? nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH?NH?PbI? thin films, reports on the fabrication of CH?NH?PbI? nanowires for optoelectrical application are rather limited. Herein, a two-step spin-coating process has been utilized to fabricate pure-phase and single-crystalline CH?NH?PbI? nanowires on a substrate without mesoporous TiO? or Al?O?. The size and density of CH?NH?PbI? nanowires can be easily controlled by changing the PbI? precursor concentration. The as-prepared CH?NH?PbI? nanowires are utilized to fabricate photodetectors, which exhibit a fairly high switching ratio of ~600, a responsivity of 55 mA/W, and a normalized detectivity of 0.5 × 1011 jones under 532 nm light illumination (40 mW/cm²) at a very low bias voltage of 0.1 V. The as-prepared perovskite CH?NH?PbI? nanowires with excellent optoelectronic properties are regarded to be a potential candidate for high-performance photodetector application.

SUBMITTER: Zhang X 

PROVIDER: S-EPMC5977332 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature