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首页> 外文会议>Physics, simulation, and photonic engineering of photovoltaic devices III >Cutoff Wavelength Optimization for High-Efficiency Split Spectrum Photovoltaics
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Cutoff Wavelength Optimization for High-Efficiency Split Spectrum Photovoltaics

机译：高效分裂谱光伏的截止波长优化

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Split spectrum photovoltaics, where incident light is divided onto multiple cells on the basis of wavelength, are an exciting recent development in the solar energy field. This technology has the potential to exceed record conversion efficiencies by utilizing a large number of p-n junctions while mitigating the constraints that plague monolithic cells: lattice matching and current matching. Each cell in a split spectrum system can have a different lattice constant (allowing for more combinations of materials) and to have different operating currents (allowing for more combinations of band spacing). In this work, we examine a split spectrum system utilizing a single spectrum splitting device (a dichroic filter) to divide the solar spectrum onto two cells. Whereas many split spectrum designs use numerous filters to direct light onto single junction cells, in this system each cell is composed of multiple active junctions. Each cell is then tailored to absorb a portion of the solar spectrum. The combination of the two cells allows for four, five, or more active junctions while maintaining lattice and current matching conditions in each cell. A number of different cutoff frequencies for the dichroic filter are examined. Each cutoff frequency corresponds to its own combination of ideal band placements for both the shorter and longer wavelength cells. Materials corresponding to those band placements are examined to determine if any combinations can satisfy lattice matching parameters; designs which do are then simulated using TCAD Sentaurus.
机译：裂谱光伏技术是将入射光根据波长分为多个单元的光伏技术，在太阳能领域是令人兴奋的最新进展。通过利用大量的p-n结，该技术有可能超过创纪录的转换效率，同时减轻困扰单体电池的限制：晶格匹配和电流匹配。裂谱系统中的每个单元可以具有不同的晶格常数（允许更多的材料组合），并具有不同的工作电流（允许带隙的更多组合）。在这项工作中，我们研究了利用单个光谱分裂装置（二向色滤光片）将太阳光谱分为两个单元的分裂光谱系统。尽管许多裂谱设计使用大量滤光片将光引导到单个结单元上，但在该系统中，每个单元都由多个有源结组成。然后，每个单元都经过调整以吸收一部分太阳光谱。两个单元的组合允许四个，五个或更多个有源结，同时在每个单元中保持晶格和电流匹配条件。检查了二向色性滤波器的许多不同截止频率。每个截止频率对应于其对于短波长和长波长单元的理想频带位置的组合。检查与这些能带位置相对应的材料，以确定是否有任何组合可以满足晶格匹配参数；然后使用TCAD Sentaurus对设计进行仿真。

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