22 October 1993 Development and fabrication of a hybrid holographic solar concentrator for concurrent generation of electricity and thermal utilization
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Abstract
The efficiency of photovoltaic generators that are based on different semiconductor materials with optimized band-gaps can achieve considerably higher values than those obtained from single junction devices, e.g. Si-based solar cells. Hence, the splitting of the solar spectrum for use with the different band-gap cells is a desired characteristic of the solar collector. An enhanced efficiency is realized with the concentration of the incident solar radiation onto the corresponding solar cell. The optical characteristics of the holographic solar concentrator satisfy these requirements. The undiffracted solar radiation should be collected by an absorber that also cools the solar cells. This is the concept of the hybrid collector for electricity and thermal utilization that is presented in this paper. It can achieve an electrical efficiency above 22% and a thermal efficiency of 35% with a temperature of 100 degree(s)C.
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Klaus Froehlich, Ernst Ulrich Wagemann, B. Frohn, Jochen Schulat, Christo G. Stojanoff, "Development and fabrication of a hybrid holographic solar concentrator for concurrent generation of electricity and thermal utilization", Proc. SPIE 2017, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XII, (22 October 1993); doi: 10.1117/12.161971; https://doi.org/10.1117/12.161971
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