Mr. Yu-Ting Hung Profile

Yu-Ting Hung

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Proceedings Article | 21 August 2009 Paper

Cylindrically symmetric Fresnel lens for high concentration photovoltaics

Yu-Ting Hung, Guo-Dung Su

Proceedings Volume 7423, 74230W (2009) https://doi.org/10.1117/12.826789

KEYWORDS: Fresnel lenses, Solar cells, Reflectivity, Systems modeling, Lenses, Photovoltaics, Sun, Optical simulations, Optical components, Autoregressive models

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High concentration photovoltaic (HCPV) utilizes point-focus cost-effective plastic Fresnel lens. And a millimeter-sized Ill-V compound multi-junction solar cell is placed underneath focusing optics which can achieve cell efficiency potential of up to 40.7 %. The advantage of HCPV makes less solar cell area and higher efficiency; however, the acceptance angle of HCPV is about ±1°, which is very small and the mechanical tracking of the sun is necessary. In order to reduce the power consumption and the angle tracking error of tracking systems, a light collector model with larger acceptance angle is designed with ZEMAX®. In this model, the original radially symmetric Fresnel lens of HCPV is replaced by cylindrically symmetric Fresnel lens and a parabolic reflective surface. Light is collected in two dimensions separately. And a couple of lenses and a light pipe are added before the solar cell chip in order to collect more light when sun light deviates from incident angle of 0⁰. An acceptance angle of ±10° is achieved with GCR 400.

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