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Methods for Rejecting Daytime Waste Heat to Outer Space

Addison K.
National Science Review
Publication Date: 
November 1, 2017
Related Program(s): 


One need go no further than the first paragraph of any article on solar energy technology to confront the mind-boggling scale of the available energy resource. The deployment of solar technology has experienced incredible growth in the past decade. This deployment has been dominated by single-junction silicon photovoltaic (PV) technology. These devices are characterized by a single bandgap, which is unable to convert a significant fraction of the incident solar spectrum. The Shockley-Queisser efficiency limit for single bandgap silicon PV devices is 32.2%, accounting both thermal losses of photons below and greatly above the bandgap and radiative recombination losses, and deployed systems experience a much lower conversion efficiency. Besides conversion efficiency, another barrier to ever-increasing solar penetration is the lack of cost-effective grid-scale electricity storage technologies, since storage is necessary for solar electricity to be available overnight or during extended periods of clouds.