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

Authors

Roger Chang, CUNY City College
Kemakorn Ithisuphalap, CUNY City College
Ilona Kretzschmar, CUNY City CollegeFollow

Document Type

Article

Publication Date

1-11-2016

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 τn/τd ratio than nanoparticle-based DSCs.

Comments

This article was originally published in AIMS Materials Science, available at DOI: 10.3934/matersci.2016.1.51.

This is an open access article distributed under the terms of the Creative Commons Attribution License.