Liquid–solid spinodal decomposition mediated synthesis of Sb2Se3 nanowires and their photoelectric behavior. Issue 30 (13th July 2015)

• Record Type: Journal Article
• Authors: Kwon, Yong Hun; Jeong, Myoungho; Do, Hyun Woo; Lee, Jeong Yong; Cho, Hyung Koun
• Is Part Of: Nanoscale. Volume 7:Issue 30(2015)
• Page Start: 12913
• Page End: 12920
• Publication Date: 2015-07-13
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr03461b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Vertically inclined Sb2 Se3 nanowires were synthesized from the Sb/Sb–Se/Se stacked elemental layer only by thermal annealing at 623 K. 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 Sb2 Se3 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 Sb2 Se3 nanowire arrays. Adaption of our synthesis approach enables significantly improved photocurrent generation in the vertically stacked structure (glass/ITO/Sb2 Se3 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 H2 SO4 .