In densely populated areas, ground mounted photovoltaic power plants compete with agriculture for cultivable land. Agrivoltaic systems allow the combination of these two forms of land use by deliberately designed light sharing. In this contribution, we present a spectrally selective solar cell, for use in agrivoltaic systems, greenhouses, and photo-bioreactors. Our concept benefits from a solar cell with a transmission spectrum which can be easily tuned for the specific absorption requirements of algae and plants. This is achieved by a Fabry-Perot-type multilayer resonator as a back reflector, which determines the transmission and absorption spectrum of the solar cell. We demonstrate the extent of how this transmission spectrum can be engineered by varying the layer thicknesses of the reflector and we show how the reflecting metal layers in the back reflector influence the transmission and photocurrent generation of the spectrally selective solar cell. Finally, we analyze the optical loss mechanisms of the solar cell layer stack to address further optimization potential. Our work offers a spectrally selective solar cell which can be easily adjusted for the requirements of combining photovoltaic and photosynthesis.

中文翻译：

---

用于光伏和光合作用的超薄锗太阳能电池的光谱工程

在人口稠密的地区，地面安装的光伏电站与农业争夺耕地。农用光伏系统可以通过精心设计的光共享方式将这两种土地利用形式结合起来。在这项贡献中，我们介绍了一种光谱选择性太阳能电池，可用于农用光伏系统，温室和光生物反应器。我们的概念得益于具有透射光谱的太阳能电池，可以轻松地针对藻类和植物的特定吸收要求对其进行调整。这是通过作为后反射器的Fabry-Perot型多层谐振器实现的，该谐振器确定了太阳能电池的透射和吸收光谱。我们展示了如何通过改变反射器的层厚度来设计这种透射光谱的程度，并且展示了后反射器中的反射金属层如何影响光谱选择性太阳能电池的透射和光电流产生。最后，我们分析了太阳能电池叠层的光损耗机制，以解决进一步的优化潜力。我们的工作提供了一种光谱选择性太阳能电池，可以很容易地对其进行调整，以满足光伏与光合作用相结合的要求。