聚光器色差对多结细胞的影响

L. W. James
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引用次数: 35

摘要

大多数实用的光伏聚光器光学具有相当大的色差。因此,在双结单片电池中,高带隙结中的电流产生模式与低带隙结中的电流产生模式不同,导致电流试图平行于隧道结和相邻层中的结。这些层的电阻率太高,无法支持这种横向电流流动,因此在电池上的每个点上,电流被限制在最低电流结中产生的电流。除非光学的色差以某种方式得到补偿,否则这将导致细胞输出的大量损失。利用软件模型研究了色差造成的损耗,设计了两种满足多结太阳能电池光谱均匀性要求的聚光光学器件。一个是空间应用,重量是最重要的问题。另一种是地面使用,成本和对结构和操作公差的低灵敏度是最重要的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of concentrator chromatic aberration on multi-junction cells
Most practical photovoltaic concentrator optics have considerable chromatic aberration. Thus in a two-junction monolithic cell, the pattern of current generation in the high-bandgap junction is different from that in the low-bandgap junction, resulting in an attempted current flow parallel to the junction in the tunnel junction and adjacent layers. Sheet resistivity of these layers is too high to support this lateral current flow, so at each point on the cell, the current is limited to the current generated in the lowest-current junction. This results in a substantial loss in cell output unless the chromatic aberration of the optics is somehow compensated for. Using a software model, the authors have examined the losses caused by chromatic aberration, and have designed two types of concentrator optics which meet the spectral uniformity needs of multijunction solar cells. One is for space applications where weight is an overriding concern. The other is for terrestrial use where cost and a low sensitivity to construction and operating tolerances are paramount.
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