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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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Published on: May 2, 2014

Single-nanowire photoelectrochemistry.

Yude Su¹, Chong Liu^1,2, Sarah Brittman^1,2

¹Department of Chemistry, University of California, Berkeley, California 94720, USA.

Nature Nanotechnology

|March 29, 2016

Summary

Single nanowire photoelectrodes reveal performance limitations in semiconductor wire arrays. Improving nanowire uniformity is crucial for efficient solar-to-fuel conversion, enhancing overall device performance.

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Area of Science:

Photoelectrochemistry
Solar energy conversion
Nanomaterials

Background:

Semiconductor nano-/microwire arrays offer enhanced photoelectrochemical performance due to high surface area.
Inhomogeneity in wire arrays complicates understanding structure-property relationships and individual wire performance.

Purpose of the Study:

To develop a single-nanowire platform for probing individual nanowire photoelectrochemical characteristics.
To identify performance limitations in nanowire arrays and guide future design.

Main Methods:

Fabrication of a single-nanowire-based photoelectrode platform.
Measurement of current-voltage (I-V) characteristics of individual nanowires.
Quantification of photogenerated electron flux as a function of nanowire dimensions.

Main Results:

Demonstrated reliable probing of individual nanowire I-V characteristics.
Identified poorly performing wires as a limiting factor in ensemble array photovoltage.
Quantified reduced photogenerated electron flux on nanowire surfaces compared to planar structures.

Conclusions:

Individual nanowire characterization is essential for understanding and optimizing photoelectrochemical performance.
Homogeneity of nanowires within an array is critical for maximizing solar-to-fuel conversion efficiency.
Accurate characterization of carrier flux is key for designing efficient nanowire photoelectrodes.