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Quantum Dot Solar Cells Based on CdSe-Assembled Titania Semiconductors

Published online by Cambridge University Press:  01 February 2011

Chien-Tsung Wang  and
Chung-Hsiao Yeh
Chien-Tsung Wang
Affiliation:
[email protected], National Yunlin University of Science and Technology, Chemical and Materials Engineering, 123 University Road, Section 3, Douliou, Yunlin, 640, Taiwan
Chung-Hsiao Yeh
Affiliation:
[email protected], National Yunlin University of Science and Technology, Chemical and Materials Engineering Department, 123 University Road, Section 3, Douliou, Yunlin, 640, Taiwan
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Abstract

In the study, semiconductor quantum dots (QDs) of CdSe nanocrystals have been demonstrated effective as the light energy harvesting assemblies in solar cells. Colloidal CdSe QDs were synthesized by the one-pot approach and linked through a surface modifier onto titania (TiO2) nanoparticles. The TiO2-CdSe composite, while employed as the photoanode in a photoelectrochemical apparatus, exhibited a higher photon-to-electron conversion efficiency (3-fold) than the TiO2 alone, and also a higher stability for photocurrent generation, according to photocurrent transient responses. The optical absorbance and photoluminescence of the CdSe colloid showed a blue shift in the absorption edge with decreasing the particle size (band energy gap shifts from 2.0 to 2.19 eV), suggesting a quantum size effect. The CdSe particle size was determined up to 5 nm by a transmission electron microscopy. A scheme describing the charge carrier rectification for the coupled semiconductor system is proposed.

Keywords

photovoltaicenergy generationnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1102: Symposium LL – Energy Harvesting–From Fundamentals to Devices , 2008 , 1102-LL04-05
Copyright
Copyright © Materials Research Society 2008

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