Oxygen-incorporated and layer-by-layer stacked WS2 nanosheets for broadband, self-driven and fast-response photodetectiont

Xu, Jun1,2; Cheng, Xialan1,2; Liu, Tong1,2; Yu, Yongqiang1,2; Song, Lingling1,2; You, Yu1,2; Wang, Tao1,2; Zhang, Junjun2,3

2019-04-14

10.1039/c8nr10350j

Nanoscale   影响因子和分区

2040-3364

2040-3372

Two-dimensional (2D) layered WS2 nanosheets have been regarded as exciting and emerging candidate materials in constructing high performance photodetectors. In this work, we develop a facile solvothermal method to synthesize oxygen-doped WS2 microrods composed of layer-by-layer stacked nanosheets. The WS2 microrods exhibit an obvious bandgap of 1.2 eV, together with a broad near-infrared (NIR) absorption after 1100 nm. The unique absorption can be ascribed to the oxygen-incorporation-induced localized surface plasmon resonance (LSPR) effect. A hybrid WS2/Si heterojunction, which allows the combination of the WS2 microrods with a mature silicon platform, is then constructed by a facile spincoating fabrication process to investigate the photoresponse properties. Benefitting from the remarkable photovoltaic performance, the WS2/Si heterojunction acts as a self-driven photodetector with outstanding characteristics. The photodetector exhibits a decent responsivity (R) of 1.5 A W-1, a high specific detectivity (D*) of similar to 2 x 10(12) Jones, fast response speeds with rise/fall times of 2.0/7.2 mu s, and good ambient stability (2 months) at zero bias. Notably, the photodetector is still sensitive at a broadband wavelength in the NIR region (1100-2000 nm). The broadband response is attributed to the LSPR effect of the oxygen-incorporated WS2. These results suggest great potential of the oxygen-incorporated WS2/Si heterojunctions in MR light detection.

SCI ; EI

英语

通讯

Natural Science Foundation of Guangdong Province[2018A030310225]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000464454400030

ROYAL SOC CHEMISTRY

20191506771549

Heterojunctions ; Infrared devices ; Nanosheets ; Oxygen ; Photodetectors ; Photons ; Silicon compounds ; Surface plasmon resonance

Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Atomic and Molecular Physics:931.3 ; Solid State Physics:933

Web of Science

1.Hefei Univ Technol, Sch Elect Sci & Appl Phys, Hefei 230009, Anhui, Peoples R China
2.Hefei Univ Technol, Micro Electromech Syst Res Ctr Engn & Technol Anh, Hefei 230009, Anhui, Peoples R China
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Xu, Jun,Cheng, Xialan,Liu, Tong,et al. Oxygen-incorporated and layer-by-layer stacked WS2 nanosheets for broadband, self-driven and fast-response photodetectiont[J]. Nanoscale,2019,11(14):6810-6816.

Xu, Jun.,Cheng, Xialan.,Liu, Tong.,Yu, Yongqiang.,Song, Lingling.,...&Zhang, Junjun.(2019).Oxygen-incorporated and layer-by-layer stacked WS2 nanosheets for broadband, self-driven and fast-response photodetectiont.Nanoscale,11(14),6810-6816.

Xu, Jun,et al."Oxygen-incorporated and layer-by-layer stacked WS2 nanosheets for broadband, self-driven and fast-response photodetectiont".Nanoscale 11.14(2019):6810-6816.