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首页> 外文会议>Nonimaging optics: efficient design for illumination and solar concentration XIV >Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems
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Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems

机译：光谱分裂光伏系统级联DCG全息元件的设计与优化

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In this work, the technique of designing and optimizing broadband volume transmission holograms using dichromate gelatin (DCG) is summarized for solar spectrum-splitting application. Spectrum splitting photovoltaic system uses a series of single bandgap PV cells that have different spectral conversion efficiency properties to more fully utilize the solar spectrum. In such a system, one or more high performance optical filters are usually required to split the solar spectrum and efficiently send them to the corresponding PV cells. An ideal spectral filter should have a rectangular shape with sharp transition wavelengths. DCG is a near ideal holographic material for solar applications as it can achieve high refractive index modulation, low absorption and scattering properties and long-term stability to solar exposure after sealing. In this research, a methodology of designing and modeling a transmission DCG hologram using coupled wave analysis for different PV bandgap combinations is described. To achieve a broad diffraction bandwidth and sharp cut-off wavelength, a cascaded structure of multiple thick holograms is described. A search algorithm is also developed to optimize both single and two-layer cascaded holographic spectrum splitters for the best bandgap combinations of two-and three-junction SSPV systems illuminated under the AM1.5 solar spectrum. The power conversion efficiencies of the optimized systems under the AM1.5 solar spectrum are then calculated using the detailed balance method, and shows an improvement compared with tandem structure.
机译：在这项工作中，总结了使用重铬酸盐明胶（DCG）设计和优化宽带体积透射全息图的技术，用于太阳光谱拆分应用。光谱分裂光伏系统使用一系列具有不同光谱转换效率特性的单带隙光伏电池，以更充分地利用太阳光谱。在这样的系统中，通常需要一个或多个高性能滤光器来分解太阳光谱并将其有效地发送到相应的PV电池。理想的光谱滤光片应为具有尖锐过渡波长的矩形。 DCG是用于太阳能应用的近乎理想的全息材料，因为它可以实现高折射率调制，低吸收和散射特性以及密封后对日光照射的长期稳定性。在这项研究中，描述了使用耦合波分析针对不同的PV带隙组合设计和建模透射DCG全息图的方法。为了获得宽的衍射带宽和尖锐的截止波长，描述了多个厚全息图的级联结构。还开发了一种搜索算法来优化单层和两层级联的全息光谱分离器，以优化在AM1.5太阳光谱下照射的两结和三结SSPV系统的最佳带隙组合。然后，使用详细的平衡法计算了AM1.5太阳光谱下优化系统的功率转换效率，与串联结构相比，该效率得到了改善。

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