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Impact of particle shape on electron transport and lifetime in zinc oxide nanorod-based dye-sensitized solar cells

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Abstract

Owing to its high electron mobility, zinc oxide represents a promising alternative to titanium dioxide as the working electrode material in dye-sensitized solar cells (DSCs). When zinc oxide is grown into 1-D nanowire arrays and incorporated into the working electrode of DSCs, enhanced electron dynamics and even a decoupling of electron transport (τd) and electron lifetime (τn) have been observed. In this work, DSCs with working electrodes composed of solution-grown, unarrayed ZnO nanorods are investigated. In order to determine whether such devices give rise to similar decoupling, intensity modulated photocurrent and photovoltage spectroscopies are used to measure τd and τn, while varying the illumination intensity. In addition, ZnO nanorod-based DSCs are compared with ZnO nanoparticle-based DSCs and nanomaterial shape is shown to affect electron dynamics. Nanorod-based DSCs exhibit shorter electron transport times, longer electron lifetimes, and a higher τnd ratio than nanoparticle-based DSCs.

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Most cited references 85

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Electron Transport in Particulate ZnO Electrodes: A Simple Approach

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Nonthermalized electron transport in dye-sensitized nanocrystalline TiO2 films: Transient photocurrent and random-walk modeling studies

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Dynamics of charge transport and recombination in ZnO nanorod array dye-sensitized solar cells

Author and article information

Affiliations
[] Department of Chemical Engineering, City College of the City University of New York, New York, NY 10031, USA
Author notes
Ilona Kretzschmar, Email: kretzschmar@123456ccny.cuny.edu; Tel: 212-650-6769; Fax: 212-650-6660.
Contributors
Journal
AIMS Materials Science
AIMS Materials Science
AIMS Press
2372-0484
2372-0468
11 January 2016
: 3
: 1
: 51-65
Categories
Research article
ScienceOpen disciplines:
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