Issue 36, 2017

van der Waals epitaxial two-dimensional CdSxSe(1−x) semiconductor alloys with tunable-composition and application to flexible optoelectronics

Abstract

Despite the substantial progress in the development of two-dimensional (2D) materials from conventional layered crystals, it still remains particularly challenging to produce high-quality 2D non-layered semiconductor alloys which may bring in some unique properties and new functions. In this work, the synthesis of well-oriented 2D non-layered CdSxSe(1−x) semiconductor alloy flakes with tunable compositions and optical properties is established. Structural analysis reveals that the 2D non-layered alloys follow an incommensurate van der Waals epitaxial growth pattern. Photoluminescence measurements show that the 2D alloys have composition-dependent direct bandgaps with the emission peak varying from 1.8 eV to 2.3 eV, coinciding well with the density functional theory calculations. Furthermore, photodetectors based on the CdSxSe(1−x) flakes exhibit a high photoresponsivity of 703 A W−1 with an external quantum efficiency of 1.94 × 103 and a response time of 39 ms. Flexible devices fabricated on a thin mica substrate display good mechanical stability upon repeated bending. This work suggests a facile and general method to produce high-quality 2D non-layered semiconductor alloys for next-generation optoelectronic devices.

Graphical abstract: van der Waals epitaxial two-dimensional CdSxSe(1−x) semiconductor alloys with tunable-composition and application to flexible optoelectronics

Supplementary files

Article information

Article type
Paper
Submitted
10 Лип 2017
Accepted
04 Сер 2017
First published
04 Сер 2017

Nanoscale, 2017,9, 13786-13793

van der Waals epitaxial two-dimensional CdSxSe(1−x) semiconductor alloys with tunable-composition and application to flexible optoelectronics

J. Xia, Y. Zhao, L. Wang, X. Li, Y. Gu, H. Cheng and X. Meng, Nanoscale, 2017, 9, 13786 DOI: 10.1039/C7NR04968D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements