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Proceedings Paper

The free form XR photovoltaic concentrator: a high performance SMS3D design
Author(s): Aleksandra Cvetkovic; Maikel Hernandez; Pablo Benítez; Juan C. Miñano; Joel Schwartz; Adam Plesniak; Russ Jones; David Whelan
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Paper Abstract

A novel photovoltaic concentrator is presented. The goal is to achieve high concentration design with high efficiency and high acceptance angle that in the same time is compact and convenient for thermal and mechanical management. This photovoltaic system is based on 1 cm2 multi-junction tandem solar cells and an XR concentrator. The XR concentrator in this system is an SMS 3D design formed by one reflective (X) and one refractive (R) free-form surfaces (i.e., without rotational or linear symmetry) and has been chosen for its excellent aspect ratio and for its ability to perform near the thermodynamic limit. It is a mirror-lens device that has no shadowing elements and has square entry aperture (the whole system aperture area is used for collecting light). This large acceptance angle relaxes the manufacturing tolerances of all the optical and mechanical components of the system included the concentrator itself and is one of the keys to get a cost competitive photovoltaic generator. For the geometrical concentration of 1000x the simulation results show the acceptance angle of ±1.8 deg. The irradiance distribution on the cell is achieved with ultra-short homogenizing prism, whose size is optimised to keep the maximum values under the ones that the cell can accept. The application of the XR optics to high-concentration is being developed in a consortium leaded by The Boeing Company, which has been awarded a project by US DOE in the framework of the Solar America Initiative.

Paper Details

Date Published: 9 September 2008
PDF: 12 pages
Proc. SPIE 7043, High and Low Concentration for Solar Electric Applications III, 70430E (9 September 2008); doi: 10.1117/12.793714
Show Author Affiliations
Aleksandra Cvetkovic, Univ. Politécnica de Madrid (Spain)
Maikel Hernandez, Light Prescriptions Innovators Europe S. L. (Spain)
Pablo Benítez, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators Europe S. L. (Spain)
Juan C. Miñano, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators Europe S. L. (Spain)
Joel Schwartz, The Boeing Co. (United States)
Adam Plesniak, The Boeing Co. (United States)
Russ Jones, The Boeing Co. (United States)
David Whelan, The Boeing Co. (United States)

Published in SPIE Proceedings Vol. 7043:
High and Low Concentration for Solar Electric Applications III
Martha Symko-Davies, Editor(s)

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