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 Xiao, Peng;Mao, Jie;Ding, Ke;Luo, Wenjin;Hu, Weida;Zhang, Xiujuan;Zhang, Xiaohong;Jie, Jiansheng;
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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