Photovoltaic (PV)-powered vehicle applications are very attractive for reducing CO₂ emission and creation of new market. Development of Si tandem solar cells is very promising for high-efficiency and low-cost solar cells. This paper presents our approaches for III–V/Si 3-junction tandem solar cells. In this paper, 24.9% efficiency Si heterojunction solar cells and mechanically stacked four-terminal 35.8% InGaP/GaAs/Si three-junction tandem solar cell are shown. Roadmap for realizing high-efficacy three-junction tandem solar cells of more than 40% is discussed in this paper. Because efficiencies of record cell of 36.1% with III–V/Si three-junction tandem cells and 33.9% with perovskite/Si two-junction cells are lower compared to 39.5% with III–V three-junction solar cells, it is necessary to clarify and reduce several losses of Si tandem solar cells. This paper presents high efficiency potential of III–V/Si three-junction and perovskite/Si two-junction solar cells analyzed by using our analytical procedure and discusses about non-radiative recombination, optical, and resistance losses in those Si tandem cells. Current status of various solar cell module efficiencies including our new record efficiency Si tandem solar cell module with an efficiency of 33.66% is also analyzed.

中文翻译：

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III-V/Si叠层太阳能电池的研究方法及Si叠层太阳能电池的比较研究

_{光伏（PV）驱动的车辆应用对于减少CO 2}排放和创造新市场非常有吸引力。硅叠层太阳能电池的发展对于高效、低成本的太阳能电池来说是非常有前景的。本文介绍了我们的 III-V/Si 3 结串联太阳能电池的方法。本文展示了效率为24.9%的Si异质结太阳能电池和机械堆叠四端35.8% InGaP/GaAs/Si三结串联太阳能电池。本文讨论了实现40%以上高效三结串联太阳能电池的路线图。由于 III-V/Si 三结串联电池的记录效率为 36.1%，钙钛矿/Si 双结电池的记录效率为 33.9%，低于 III-V 三结太阳能电池的 39.5%，因此有必要阐明并减少硅叠层太阳能电池的一些损耗。本文介绍了使用我们的分析程序分析的 III-V/Si 三结和钙钛矿/Si 二结太阳能电池的高效率潜力，并讨论了这些 Si 串联电池中的非辐射复合、光学和电阻损耗。还分析了各种太阳能电池组件效率的现状，包括我们新纪录的效率高达33.66%的硅串联太阳能电池组件。