The potential and design principle for next‐generation spectrum‐splitting photovoltaics: Targeting 50% efficiency through built‐in filters and generalization of concept,Progress in Photovoltaics

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The potential and design principle for next‐generation spectrum‐splitting photovoltaics: Targeting 50% efficiency through built‐in filters and generalization of concept
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2018-10-23 , DOI: 10.1002/pip.3081
Dongchen Lan ₁ , Martin A. Green ₁

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Increasing the sunlight to electricity conversion efficiency is a key driver for on‐going photovoltaic cost reduction. One of the most successful approaches for improving the efficiency is to split sunlight into suitable spectral bands for a set of solar cells with appropriate energy band gaps. Using this concept, in 2014, our group demonstrated the first photovoltaic conversion efficiency above 40%, where an external filter directed a portion of the sunlight normally wasted by commercial InGaP/InGaAs/Ge triple‐junction cells to a silicon cell. Here, we analyze the primary power losses in state‐of‐the‐art spectrum‐splitting photovoltaic modules and evaluate the potential for further efficiency increase. Two further developments, applying built‐in filters and generalizing the present concept, are proposed for next‐generation spectrum‐splitting photovoltaics, which can make 50% efficiency a realistic target. The design principal is briefed as is the comparison with monolithic multijunction cells.

中文翻译：

下一代频谱分裂光伏技术的潜力和设计原则：通过内置滤波器和概念概括将目标效率提高到50％

增加阳光到电能的转换效率是持续降低光伏成本的关键驱动力。提高效率的最成功方法之一是将太阳光分成具有一组合适能带隙的一组太阳能电池的合适光谱带。利用这一概念，我们的小组在2014年展示了第一个高于40％的光电转换效率，其中外部滤光器将通常由商业InGaP / InGaAs / Ge三结电池浪费的一部分阳光引向硅电池。在这里，我们分析了最先进的频谱分离光伏模块的主要功率损耗，并评估了进一步提高效率的潜力。进行了两项进一步的开发，应用了内置过滤器并推广了本概念，提出了用于下一代光谱分裂光伏技术的建议，它可以使50％的效率成为现实的目标。简要介绍了设计原理以及与单片多结电池的比较。

更新日期：2018-10-23

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