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首页> 外文会议>Nonimaging optics: Efficient design for illumination and solar concentration VIII >High-efficiency Kohler photovoltaic concentrators with external light confinement
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High-efficiency Kohler photovoltaic concentrators with external light confinement

机译：具有外部光限制的高效科勒光伏集中器

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Metal grid lines are a vital element in multijunction solar cells in order to take out from the cell the generated photocurrent. Nevertheless all this implies certain shadowing factor and thus certain reflectivity on cells surface that lowers its light absorption. This reflectivity produces a loss in electrical efficiency and thus a loss in global energy production for CPV systems. We present here an optical design for recovering this portion of reflected light, and thus leading to a system efficiency increase. This new design is based on an external confinement cavity, an optical element able to redirect the light reflected by the cell towards its surface again. It has been possible thanks to the recent invention of the advanced Kohler concentrators by LPI, likely to integrate one of these cavities easily. We have proven the excellent performance of these cavities integrated in this kind of CPV modules offering outstanding results: 33.2% module electrical efficiency @Tcell=25℃ and relative efficiency and I_(sc) gains of over 6%.
机译：金属网格线是多结太阳能电池中的重要元素，以便从电池中取出产生的光电流。尽管如此，所有这些都暗示了一定的阴影因素，因此暗示了细胞表面一定的反射率，从而降低了其光吸收率。这种反射率会导致电效率下降，进而导致CPV系统的全球能源生产下降。我们在这里介绍一种光学设计，用于回收这部分反射光，从而提高系统效率。这种新设计基于外部限制腔，该腔是一种光学元件，能够将细胞反射的光再次重定向到其表面。由于LPI最近发明了先进的科勒浓缩器，因此有可能很容易地集成其中一种型腔。我们已经证明这些腔体集成在这类CPV模块中的出色性能可提供出色的结果：@ Tcell = 25℃时，模块电效率为33.2％，相对效率和I_（sc）增益超过6％。

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