Improved sensitization of zinc oxide nanorods by cadmium telluride quantum dots through charge induced hydrophilic surface generation

Karthik Laxman, Tanujjal Bora, Salim H. Al-Harthi, Joydeep Dutta

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper reports on UV-mediated enhancement in the sensitization of semiconductor quantum dots (QDs) on zinc oxide (ZnO) nanorods, improving the charge transfer efficiency across the QD-ZnO interface. The improvement was primarily due to the reduction in the interfacial resistance achieved via the incorporation of UV light induced surface defects on zinc oxide nanorods. The photoinduced defects were characterized by XPS, FTIR, and water contact angle measurements, which demonstrated an increase in the surface defects (oxygen vacancies) in the ZnO crystal, leading to an increase in the active sites available for the QD attachment. As a proof of concept, a model cadmium telluride (CdTe) QD solar cell was fabricated using the defect engineered ZnO photoelectrodes, which showed ∼10% increase in photovoltage and ∼66% improvement in the photocurrent compared to the defect-free photoelectrodes. The improvement in the photocurrent was mainly attributed to the enhancement in the charge transfer efficiency across the defect rich QD-ZnO interface, which was indicated by the higher quenching of the CdTe QD photoluminescence upon sensitization.

Original languageEnglish
Article number919163
JournalJournal of Nanomaterials
Volume2014
DOIs
Publication statusPublished - Dec 9 2014

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Zinc Oxide
Cadmium telluride
Zinc oxide
Nanorods
Semiconductor quantum dots
Defects
Surface defects
Photocurrents
Charge transfer
Oxygen vacancies
Angle measurement
Ultraviolet radiation
Contact angle
cadmium telluride
Quenching
Solar cells
Photoluminescence
X ray photoelectron spectroscopy
Crystals
Water

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Improved sensitization of zinc oxide nanorods by cadmium telluride quantum dots through charge induced hydrophilic surface generation. / Laxman, Karthik; Bora, Tanujjal; Al-Harthi, Salim H.; Dutta, Joydeep.

In: Journal of Nanomaterials, Vol. 2014, 919163, 09.12.2014.

Research output: Contribution to journalArticle

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