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CdSSe layer-sensitized TiO2 nanowire arrays as efficient photoelectrodes

Authors
Sung, Tae KwangKang, Jun HaJang, Dong MyungMyung, YoonJung, Gyeong BokKim, Han SungJung, Chan SuCho, Yong JaePark, JeungheeLee, Chang-Lyoul
Issue Date
2011
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.21, no.12, pp.4553 - 4561
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY
Volume
21
Number
12
Start Page
4553
End Page
4561
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/114912
DOI
10.1039/c0jm03818k
ISSN
0959-9428
Abstract
Complete composition-tuned CdSxSe1-x alloy layers (avg. thickness - 50 nm) were deposited on pre-grown TiO2 nanowires by the thermal vapor transport of CdS/CdSe powders, producing core-shell nanocable arrays. CdSxSe1-x alloy nanowires were also synthesized with full composition tuning by the same method for comparison. The CdSSe nanowires consisted of Se-rich and S-rich pseudo binary phases, while the nanocable shell consisted of more complex multinary phases including CdSe and CdS. Remarkably, unique CdS-CdSSe-CdSe multishell structures were produced in the Se-rich composition range. The photoelectrochemical (PEC) cells fabricated using the as-grown nanocable arrays show higher solar photocurrents and hydrogen generation rates for the Se-rich shelled TiO2 nanocable arrays. This suggests that the CdS-CdSSe-CdSe multishell structures increase greatly the PEC performance by producing novel band alignment for efficient electron-hole separation following enhanced visible-range photon absorption.
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