Issue 8, 2017, Issue in Progress

Band-tunable photodetectors based on graphene/alloyed ZnxCd1−xS film hybrids

Abstract

Graphene/semiconductor film hybrid-based photodetectors have attracted extensive attention because of their ultra-high performance. However, only the photoconductive behavior of binary semiconductors with fixed bandgap was studied since achieving tunable optoelectronic properties is significant for the practical applications of semiconductors. Herein, alloyed ZnxCd1−xS (0 ≤ x ≤ 1) films with complete compositional tunability were successfully prepared by an e-beam evaporation method via changing the molar ratio of ZnS to CdS in the target. UV-visible optical absorption measurements showed that the composition-dependent band-edge absorption is generated in the as-prepared alloyed ZnxCd1−xS films, with the energy gaps continuously shifted from 2.41 eV (x = 0, CdS) to 3.67 eV (x = 1, ZnS). After graphene is transferred on the alloyed ZnxCd1−xS films, band-tunable photodetectors are achieved based on graphene/alloyed ZnxCd1−xS film hybrids with the cut-off wavelength in the spectral response gradually changing from 410 nm to 580 nm. Obviously, the method introduced in this study can be extended to fabricate other graphene/alloyed ternary film hybrid-based photodetectors with band tunability in the visible and infrared region.

Graphical abstract: Band-tunable photodetectors based on graphene/alloyed ZnxCd1−xS film hybrids

Article information

Article type
Paper
Submitted
15 Nov 2016
Accepted
22 Dec 2016
First published
16 Jan 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 4444-4452

Band-tunable photodetectors based on graphene/alloyed ZnxCd1−xS film hybrids

F. Huang, S. Ouyang, F. Jia, C. Cai, Z. Xu, C. Wu, Y. Ma and M. Wang, RSC Adv., 2017, 7, 4444 DOI: 10.1039/C6RA26823D

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.

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