Journal article
Conductivity of ZnO nanowires, nanoparticles, and thin films using time-resolved terahertz spectroscopy
The journal of physical chemistry. B, v 110(50), pp 25229-25239
21 Dec 2006
PMID: 17165967
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The terahertz absorption coefficient, index of refraction, and conductivity of nanostructured ZnO have been determined using time-resolved terahertz spectroscopy, a noncontact optical probe. ZnO properties were measured directly for thin films and were extracted from measurements of nanowire arrays and mesoporous nanoparticle films by applying Bruggeman effective medium theory to the composite samples. Annealing significantly reduces the intrinsic carrier concentration in the ZnO films and nanowires, which were grown by chemical bath deposition. The complex-valued, frequency-dependent photoconductivities for all morphologies were found to be similar at short pump-probe delay times. Fits using the Drude-Smith model show that films have the highest mobility, followed by nanowires and then nanoparticles, and that annealing the ZnO increases its mobility. Time constants for decay of photoinjected electron density in films are twice as long as those in nanowires and more than 5 times those for nanoparticles due to increased electron interaction with interfaces and grain boundaries in the smaller-grained materials. Implications for electron transport in dye-sensitized solar cells are discussed.
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Details
- Title
- Conductivity of ZnO nanowires, nanoparticles, and thin films using time-resolved terahertz spectroscopy
- Creators
- Jason B Baxter - Chemistry Department, Yale University, New Haven, Connecticut 06520-8107, USACharles A Schmuttenmaer
- Publication Details
- The journal of physical chemistry. B, v 110(50), pp 25229-25239
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000242825400013
- Scopus ID
- 2-s2.0-33846664436
- Other Identifier
- 991014878401404721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Biophysics
- Chemistry, Physical