Jump to main content
Jump to site search

Issue 36, 2015
Previous Article Next Article

Stable, highly-responsive and broadband photodetection based on large-area multilayered WS2 films grown by pulsed-laser deposition

Author affiliations

Abstract

The progress in the field of graphene has aroused a renaissance of keen research interest in layered transition metal dichalcogenides (TMDs). Tungsten disulfide (WS2), a typical TMD with favorable semiconducting band gap and strong light–matter interaction, exhibits great potential for highly-responsive photodetection. However, WS2-based photodetection is currently unsatisfactory due to the low optical absorption (2%–10%) and poor carrier mobility (0.01–0.91 cm2 V−1 s−1) of the thin WS2 layers grown by chemical vapor deposition (CVD). Here, we introduce pulsed-laser deposition (PLD) to prepare multilayered WS2 films. Large-area WS2 films of the magnitude of cm2 are achieved. Comparative measurements of a WS2-based photoresistor demonstrate its stable broadband photoresponse from 370 to 1064 nm, the broadest range demonstrated in WS2 photodetectors. Benefiting from the large optical absorbance (40%–85%) and high carrier mobility (31 cm2 V−1 s−1), the responsivity of the device approaches a high value of 0.51 A W−1 in an ambient environment. Such a performance far surpasses the CVD-grown WS2-based photodetectors (μA W−1). In a vacuum environment, the responsivity is further enhanced to 0.70 A W−1 along with an external quantum efficiency of 137% and a photodetectivity of 2.7 × 109 cm Hz1/2 W−1. These findings stress that the PLD-grown WS2 film may constitute a new paradigm for the next-generation stable, broadband and highly-responsive photodetectors.

Graphical abstract: Stable, highly-responsive and broadband photodetection based on large-area multilayered WS2 films grown by pulsed-laser deposition

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 May 2015, accepted on 10 Aug 2015 and first published on 17 Aug 2015


Article type: Paper
DOI: 10.1039/C5NR03361F
Author version
available:
Download author version (PDF)
Nanoscale, 2015,7, 14974-14981

  •   Request permissions

    Stable, highly-responsive and broadband photodetection based on large-area multilayered WS2 films grown by pulsed-laser deposition

    J. D. Yao, Z. Q. Zheng, J. M. Shao and G. W. Yang, Nanoscale, 2015, 7, 14974
    DOI: 10.1039/C5NR03361F

Search articles by author

Spotlight

Advertisements