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

Tungsten Lattice Structure May Improve Thermal Photovoltaics

Photonics Spectra
Aug 2003
A tungsten 3-D photonic crystal developed at Sandia National Laboratories in Albuquerque, N.M., may have applications in thermal photovoltaic power generation for hybrid electric automobiles and for waste-heat-driven generators in industrial plants. In a series of experiments that the Sandia team reported in the July 14 issue of Applied Physics Letters, the tungsten emitter significantly outperformed an ideal blackbody, a phenomenon that the team will address in forthcoming issues of Optics Letters.

The photonic crystals comprise stacks of 500-nm-wide, 750-nm-high parallel tungsten rods spaced 1.5 µm apart and oriented 90° from one layer to the next. When biased at 6.5 V, producing an effective temperature of 1535 K, the structures produced 1.5-µm radiation with a peak power density of 40.5 W/cm2 and a spectral linewidth of 900 nm. The researchers note that this emission linewidth is the equivalent of a blackbody at 4000 K and that the peak emission wavelength is a good match for the electronic bandgap of a GaSb photovoltaic cell.

In a thermal photovoltaic system, the photovoltaic cell converts the incoming infrared radiation from a heat generator into electricity. The researchers' models of a planar setup suggest that optical-to-electrical conversion efficiencies as high as 34 percent and electrical power densities of up to 14 W/cm2 are possible using a GaSb cell and the photonic crystal emitter.


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!