Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

Hot Electron Transfer Solar Cells Show Promise

Photonics Spectra
Mar 2003
 Results of a study published in the Feb. 6 issue of Nature suggest the feasibility of photovoltaic cells based on a new device structure that captures energetic electrons generated by photon absorption in photoreceptive dyes and that transfers them through an ultrathin metal film into an inexpensive polycrystalline semiconductor. Although the initial devices, demonstrated by Eric W. McFarland and Jing Tang at the University of California, Santa Barbara, displayed an overall efficiency of less than 1 percent because of low dye coverage, their internal quantum efficiency of approximately 10 percent suggests that the approach holds promise with further development.

The solar cells comprise a layer of merbromin adsorbed onto an Au/TiO2/Ti structure. The researchers suggest that the devices function by injecting photoexcited "hot" electrons through the Au and over the Schottky barrier at the Au/TiO2 interface. Electrons then pass through an external circuit and return to the Au layer to replenish the electron content of the merbromin.

Other photoreceptors, such as semiconducting quantum dots, also may be employed as absorbers, McFarland noted.


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!