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Refractive spectrum splitting photovoltaic concentrator system
| Details |
Inventors: Converse, Alexander K.;
Assignee:
Primary Examiner: Diamond; Alan
Assistant Examiner:
Attorney, Agent or Firm:
A solar energy conversion system, in which two separated arrays of refracting elements disperse incident sunlight and concentrate the sunlight onto solar energy converters, such that each converter receives a narrow portion of the broad solar spectrum and thereby operates at higher efficiency. |
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DETAILED DESCRIPTION The present invention is directed towards a solar energy conversion system that concentrates sunlight and refractively splits the solar spectrum into narrow components.
In the present invention, sunlight passes sequentially through two separated arrays of refracting elements, which direct photons in different energy bands to appropriate solar energy converters, such as semiconductor photovoltaic cells having suitable band gaps.
The present invention is generally advantageous in that concentration permits the use of a smaller quantity of relatively costly photovoltaic cells, and spectrum splitting allows those cells to operate at higher efficiency.
Furthermore, the optical components may be economically manufactured of durable materials using methods known from Fresnel lens manufacture.
In comparison to splitting the solar spectrum by stacking photovoltaic cells, the present invention is advantageous in that the photovoltaic cells may be optimized for solar energy conversion without regard for their transparency.
For example, the absorbing layers can be thick and the back electrical contact can be an opaque metal layer.
In comparison to splitting with a dichroic filter, the present invention is advantageous in that the number of photovoltaic cells is not limited by the optical arrangement.
In comparison to splitting by diffraction, the present invention is advantageous in that a broader portion of the solar spectrum may be practically directed to the Photovoltaic cells.
In comparison to spitting by concentrating, collimating, and then dispersing sunlight, the present invention is advantageous in that fewer optical elements are required.
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Optical Systems 
