17 February 2017 Two-junction holographic spectrum-splitting microconcentrating photovoltaic system
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yuechen Wu, Raymond K. Kostuk, "Two-junction holographic spectrum-splitting microconcentrating photovoltaic system," Journal of Photonics for Energy 7(1), 017001 (17 February 2017). https://doi.org/10.1117/1.JPE.7.017001 . Submission: Received: 28 November 2016; Accepted: 30 January 2017
Received: 28 November 2016; Accepted: 30 January 2017; Published: 17 February 2017

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