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Photosensitization of ZnO nanowire-based electrodes using one-step hydrothermally synthesized CdSe/CdS (core/shell) sensitizer

Title
Photosensitization of ZnO nanowire-based electrodes using one-step hydrothermally synthesized CdSe/CdS (core/shell) sensitizer
Author
Hui, Kwan-San
Keywords
Photoelectrochemical cells; CdS@CdSe; Structure; Morphology; Photoluminescence
Issue Date
2016-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
SOLAR ENERGY, v. 125, Page. 125-134
Abstract
One-step assembled CdSe/CdS (core/shell) quantum dots (QDs) were deposited onto ZnO nanowires (NWs) and characterized for their structure, morphology and optical analyses. As deposited ZnO NWs array were wurtzite in structure. During a single hydrothermal cycle a layer of similar to 4 nm CdSe/CdS QDs was formed onto ZnO NWs and overgrowth evidenced with an additional 2-5 layers due to which, (a) absorbance density, and (b) Raman Shift of ILO mode (from 286 cm(-1) to 296 cm(-1)) increased and (c) the photoluminescence intensity of the near band-edge emission peak at similar to 379 nm decreased. Due to more accumulation of CdSe/CdS, photoelectrochemical cells of ZnO-based photoelectrodes designed for 1-4 cycles of CdSe/CdS onto indium-tin-oxide substrate demonstrated increasing power conversion efficiency trend from 0.18% to 1.29% whereas, for 5th cycle power conversion efficiency, due to an increased series resistance, decreased to 1.12% on account of an accumulation of several QDs. (C) 2015 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0038092X15006611?via%3Dihubhttp://hdl.handle.net/20.500.11754/33961
ISSN
0038-092X
DOI
10.1016/j.solener.2015.12.002
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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