Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 1, Pages 113-117Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.08.015
Keywords
Spheroidal TiO2; DMF treatment; CdS; QDs solar cells; Charge transport
Categories
Funding
- Nano RD program [2007-02866]
- Engineering Research Center [R11-2008-088-01001-0]
- Ministry of Education, Science, and Technology
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A nanospheroidal TiO2 mesoporous layer combined with cadmium sulfide (CdS) quantum dots (QDs) as a sensitizer was firstly utilized for solar cell applications, resulting in an efficiency of 1.2% at a 1 sun condition. CdS quantum dots (similar to 18 nm) were attached to the TiO2 nanospheroidal electrode by using a chemical bath deposition technique. The influence of surface treatment using dimethyl formamide on the interconnectivity of the TiO2 nanospheroidal electrodes was investigated. The charge transport of TiO2/CdS QDs/electrolyte sandwich-type cells was characterized by electrochemical impedance spectroscopy and the device performance was compared with conventional nanospherical TiO2 (Degauusa P25) electrodes. The electrodes with nanospheroidal morphology showed better device performance than the P25 nanoparticle electrodes primarily due to both better connectivity among nanospheroidal TiO2 particles and larger mesopores, resulting in deeper penetration of the electrolyte in QD-sensitized solar cells. (C) 2009 Elsevier Ltd. All rights reserved.
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