Plasmon Enhanced Solar-to-Fuel Energy Conversion
Abstract
Future generations of photoelectrodes for solar fuel generation must employ inexpensive, earth-abundant absorber materials in order to provide a large-scale source of clean energy. These materials tend to have poor electrical transport properties and exhibit carrier diffusion lengths which are significantly shorter than the absorption depth of light. As a result, many photo-excited carriers are generated too far from a reactive surface, and recombine instead of participating in solar-to-fuel-conversion. We demonstrate that plasmonic resonances in metallic nanostructures and multi-layer interference effects can be engineered to strongly concentrate sunlight close to the electrode/liquid interface, precisely where the relevant reactions take place. By comparing spectral features in the enhanced photocurrent spectra to full-field electromagnetic simulations, the contribution of surface plasmon excitations is verified. These results open the door to the optimization of a wide variety of photochemical processes by leveraging the rapid advances in the field of plasmonics.
Cite
@article{arxiv.1103.0360,
title = {Plasmon Enhanced Solar-to-Fuel Energy Conversion},
author = {I. Thomann and B. A. Pinaud and Z. Chen and B. M. Clemens and T. F. Jaramillo and Mark. L. Brongersma},
journal= {arXiv preprint arXiv:1103.0360},
year = {2011}
}