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

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Title
Liquid–solid spinodal decomposition mediated synthesis of Sb2Se3 nanowires and their photoelectric behavior
Author(s)
Kwon Y.H.; Myoungho Jeong; Do H.W.; Jeong Yong Lee; Cho H.K.
Publication Date
2015-08
Journal
NANOSCALE, v.7, no.30, pp.12913 - 12920
Publisher
ROYAL SOC CHEMISTRY
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. This journal is © The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/1947
ISSN
2040-3364
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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