Light Management

Two-junction holographic spectrum-splitting microconcentrating photovoltaic system

[+] Author Affiliations
Yuechen Wu

University of Arizona, Department of Electrical and Computer Engineering, Tucson, Arizona, United States

Raymond K. Kostuk

University of Arizona, Department of Electrical and Computer Engineering, Tucson, Arizona, United States

University of Arizona, College of Optical Sciences, Tucson, Arizona, United States

J. Photon. Energy. 7(1), 017001 (Feb 17, 2017). doi:10.1117/1.JPE.7.017001
History: Received November 28, 2016; Accepted January 30, 2017
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Abstract.  Spectrum-splitting is a multijunction photovoltaic technology that can effectively improve the conversion efficiency and reduce the cost of photovoltaic systems. Microscale PV design integrates a group of microconcentrating photovoltaic (CPV) systems into an array. It retains the benefits of CPV and obtains other benefits such as a compact form, improved heat rejection capacity, and more versatile PV cell interconnect configurations. We describe the design and performance of a two-junction holographic spectrum-splitting micro-CPV system that uses GaAs wide bandgap and silicon narrow bandgap PV cells. The performance of the system is simulated with a nonsequential raytracing model and compared to the performance of the highest efficiency PV cell used in the micro-CPV array. The results show that the proposed system reaches the conversion efficiency of 31.98% with a quantum concentration ratio of 14.41× on the GaAs cell and 0.75× on the silicon cell when illuminated with the direct AM1.5 spectrum. This system obtains an improvement over the best bandgap PV cell of 20.05%, and has an acceptance angle of ±6  deg allowing for tolerant tracking.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Yuechen Wu and Raymond K. Kostuk
"Two-junction holographic spectrum-splitting microconcentrating photovoltaic system", J. Photon. Energy. 7(1), 017001 (Feb 17, 2017). ; http://dx.doi.org/10.1117/1.JPE.7.017001


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