Advanced Concepts and Applications

Micro-optical designs for angular confinement in solar cells

[+] Author Affiliations
Jeffrey M. Gordon

Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, Department of Solar Energy and Environmental Physics, Sede Boqer Campus 84990, Israel

Ben-Gurion University of the Negev, Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Beersheva 84105, Israel

Daniel Feuermann

Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, Department of Solar Energy and Environmental Physics, Sede Boqer Campus 84990, Israel

Heylal Mashaal

Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, Department of Solar Energy and Environmental Physics, Sede Boqer Campus 84990, Israel

Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, Albert Katz School for Desert Studies, Sede Boqer Campus 84990, Israel

J. Photon. Energy. 5(1), 055599 (Mar 13, 2015). doi:10.1117/1.JPE.5.055599
History: Received November 12, 2014; Accepted February 16, 2015
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Abstract.  We identify and evaluate a variety of efficient and feasible micro-optics for confining the radiative emission of solar cells. The key criteria used for assessing viable designs are (1) high optical efficiency for both the transmission of impinging solar beam radiation and the external recycling of isotropic cell luminescent emission; (2) liberal optical tolerance; (3) compactness; and (4) being amenable to fabrication from existing materials and manufacturing processes. Both imaging and nonimaging candidate designs are presented, and their superiority to previous proposals is quantified. The strategy of angular confinement for boosting cell open-circuit voltage—thereby enhancing conversion efficiency—is limited to cells where radiative recombination is the dominant carrier recombination pathway. Optical systems that restrict the angular range for emission of cell luminescence must, by reciprocity, commensurately restrict the angular range for the collection of solar radiation. This, in turn, mandates the introduction of concentrators, but not for the objective of delivering concentrated flux onto the cell. Rather, the optical system must project an acceptably uniform spatial distribution of solar flux onto the cell surface at a nominal averaged irradiance of 1 sun.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Jeffrey M. Gordon ; Daniel Feuermann and Heylal Mashaal
"Micro-optical designs for angular confinement in solar cells", J. Photon. Energy. 5(1), 055599 (Mar 13, 2015). ; http://dx.doi.org/10.1117/1.JPE.5.055599


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