Construction of efficient CdS-TiO2 heterojunction for enhanced photocurrent, photostability, and photoelectron lifetimes

Title
Construction of efficient CdS-TiO2 heterojunction for enhanced photocurrent, photostability, and photoelectron lifetimes
Authors
Shankara S. Kalanur황윤정주오심
Keywords
CdS-sensitized TiO2; Solvothermal method; Sensitization; Photoelectrochemical cell; Photocurrent; Fill factor; Photostability; Incident photon-to-current conversion efficiency; Recombination; Photoelectron lifetime
Issue Date
2013-07
Publisher
Journal of colloid and interface science
Citation
VOL 402, 94-99
Abstract
The photoefficiency of CdS/TiO2 electrodes can be enhanced by employing efficient method of CdS sensitization from which, the contact area, thickness of CdS layer, and the recombination of photoelectrons with electrolyte can be controlled. Here, we demonstrate a simple solvothermal approach of CdS quantum dots (QDs) sensitization on TiO2 nanoparticle (NP) film coated on FTO. Our new approach prevents the clogging of CdS QDs and promotes uniform deposition of QDs throughout the mesoporous TiO2 NP film. The sensitization of CdS can be controlled by the reaction time and the concentration of the precursors. The solvothermally sensitized photoanodes exhibit enhanced photocurrents and fill factors and improved photostability in aqueous solution compared to the one prepared by a conventional SILAR method. Open-circuit potential decay measurement under shutting off illumination shows that the lifetime of photoelectron is extended with solvothermally prepared CdS layer, indicating efficient suppression of recombination of the accumulated electron in TiO2 to the electrolyte. This methodology can be applied in making more efficient heterojunctions consisting of CdS and other wide band gap oxide semiconductors which could improve charge separation and mitigate charge recombination for photoelectrochemical applications.
URI
http://pubs.kist.re.kr/handle/201004/44901
ISSN
00219797
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KIST Publication > Article
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