Solution-Processed 3D RGO-MoS /Pyramid Si Heterojunction for Ultrahigh Detectivity and Ultra-Broadband Photodetection.

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ID: 95140
2018
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Abstract
Molybdenum disulfide (MoS ), a typical 2D metal dichalcogenide (2DMD), has exhibited tremendous potential in optoelectronic device applications, especially in photodetection. However, due to the weak light absorption of planar mono-/multilayers, limited cutoff wavelength edge, and lack of high-quality junctions, most reported MoS -based photodetectors show undesirable performance. Here, a structurized 3D heterojunction of RGO-MoS /pyramid Si is demonstrated via a simple solution-processing method. Owing to the improved light absorption by the pyramid structure, the narrowed bandgap of the MoS by the imperfect crystallinity, and the enhanced charge separation/transportation by the inserted reduced graphene oxide (RGO), the assembled photodetector exhibits excellent performance in terms of a large responsivity of 21.8 A W , extremely high detectivity up to 3.8 × 10 Jones (Jones = cm Hz W ) and ultrabroad spectrum response ranging from 350 nm (ultraviolet) to 4.3 µm (midwave infrared). These device parameters represent the best results for MoS -based self-driven photodetectors, and the detectivity value sets a new record for the 2DMD-based photodetectors reported thus far. Prospectively, the design of novel 3D heterojunction can be extended to other 2DMDs, opening up the opportunities for a host of high-performance optoelectronic devices.
Reference Key
xiao2018solutionprocessedadvanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Peng Xiao, Jie Mao, Ke Ding, Wenjin Luo, Weida Hu, Xiujuan Zhang, Xiaohong Zhang, Jiansheng Jie
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Journal advanced materials (deerfield beach, fla)
Year 2018
DOI
10.1002/adma.201801729
URL
Keywords
rgo-mos2 composite film pyramid si ultra-broadband photodetection ultrahigh detectivity

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