Issue 30, 2015

Liquid–solid spinodal decomposition mediated synthesis of Sb2Se3 nanowires and their photoelectric behavior

Abstract

The convenient synthesis of one-dimensional nanostructures of chalcogenide compounds with a visible band-gap is an essential research topic in developing next-generation photoelectronic devices. In particular, the design of a theoretically predictable synthesis process provides great flexibility and has a considerable ripple effect in nanotechnology. In this study, a novel rational growth approach is designed using the spinodal decomposition phenomenon for the synthesis of the Sb2Se3 nanowires, which is based on the thermodynamic phase diagram. Using a stacked elemental layer (Sb/Sb–Se/Se) and heat treatment at 623 K for 30 min under an N2 atmosphere, the vertically inclined one-dimensional nanostructures are experimentally demonstrated. An additional annealing process at 523 K in a vacuum effectively removed excess Se elements due to their high vapor pressure, resulting in highly dense single crystal Sb2Se3 nanowire arrays. Adaption of our synthesis approach enables significantly improved photocurrent generation in the vertically stacked structure (glass/ITO/Sb2Se3 nanowires/ITO/PEN) from 6.4 (dark) to under 690 μA (at 3 V under AM 1.5G). In addition, a photoelectrochemical test demonstrated their p-type conductivity and robust photocorrosion performance in 0.5 M H2SO4.

Graphical abstract: Liquid–solid spinodal decomposition mediated synthesis of Sb2Se3 nanowires and their photoelectric behavior

Supplementary files

Article information

Article type
Paper
Submitted
26 May 2015
Accepted
24 Jun 2015
First published
29 Jun 2015

Nanoscale, 2015,7, 12913-12920

Author version available

Liquid–solid spinodal decomposition mediated synthesis of Sb2Se3 nanowires and their photoelectric behavior

Y. H. Kwon, M. Jeong, H. W. Do, J. Y. Lee and H. K. Cho, Nanoscale, 2015, 7, 12913 DOI: 10.1039/C5NR03461B

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