Enhanced photoresponse of ZnO quantum dot-decorated MoS2 thin films

Ghazanfar Nazir; M. Farooq Khan; Imtisal Akhtar; Kamran Akbar; Praveen Gautam; Hwayong Noh; Yongho Seo; Seung-Hyun Chun; Jonghwa Eom

doi:10.1039/C7RA01222E

Enhanced photoresponse of ZnO quantum dot-decorated MoS₂ thin films†

Ghazanfar Nazir,^a M. Farooq Khan,^a Imtisal Akhtar,^b Kamran Akbar,^a Praveen Gautam,^a Hwayong Noh,^a Yongho Seo,

^b Seung-Hyun Chun

^a and Jonghwa Eom

*^a

Author affiliations

* Corresponding authors

^a Department of Physics & Astronomy, Graphene Research Institute, Sejong University, Seoul 05006, Korea
E-mail: eom@sejong.ac.kr

^b Department of Nanotechnology & Advanced Materials Engineering, Graphene Research Institute, Sejong University, Seoul 05006, Korea

Abstract

Transition metal dichalcogenides (TMDs) have been attracting attention because of their applications in optoelectronics and photo-detection. A widely used TMD semiconductor is molybdenum disulfide (MoS₂), which has tremendous applications because of its tunable bandgap and high luminescence quantum efficiency. This paper reports on high photo responsivity (R_λ ∼ 1913 A W⁻¹) of MoS₂ photodetector by decorating a thin layer of zinc oxide (ZnO) quantum dots (ZnO-QDs) on MoS₂. Results show that R_λ increases dramatically to 2267 A W⁻¹ at V_bg = 30 V. The high response of ZnO-QDs/MoS₂ heterostructures is attributed to a number of factors, such as effective charge transfer between ZnO-QDs and MoS₂ surface and re-absorption of light photon resulting in production of electron–hole pairs.

Supplementary files

Article information

DOI: https://doi.org/10.1039/C7RA01222E
Article type: Paper
Submitted: 28 Jan 2017
Accepted: 09 Mar 2017
First published: 17 Mar 2017
This article is Open Access

Download Citation

RSC Adv., 2017,7, 16890-16900

Permissions

Request permissions

Enhanced photoresponse of ZnO quantum dot-decorated MoS₂ thin films

G. Nazir, M. F. Khan, I. Akhtar, K. Akbar, P. Gautam, H. Noh, Y. Seo, S. Chun and J. Eom, RSC Adv., 2017, 7, 16890 DOI: 10.1039/C7RA01222E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

RSC Advances

Enhanced photoresponse of ZnO quantum dot-decorated MoS₂ thin films†

Abstract

Supplementary files

Article information

Download Citation

Permissions

Enhanced photoresponse of ZnO quantum dot-decorated MoS₂ thin films

Social activity

Search articles by author

Spotlight

Advertisements

RSC Advances