Multijunction solar cells are the highest efficiency photovoltaic devices yet demonstrated for both space and terrestrial applications. In recent years five-junction cells based on the direct semiconductor bonding technique (SBT), demonstrates space efficiencies >35% and presents application potentials. In this paper, the major challenges for fabricating SBT 5J cells and their appropriate strategies involving structure tunning, band engineering and material tailoring are stated, and 4-cm ² 35.4% (AM0, one sun) 5J SBT cells are presented. Further efforts on detailed optical managements are required to improve the current generating and matching in subcells, to achieve efficiencies 36%–37%, or above.

中文翻译：

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>35% 基于直接键合技术的 5 结空间太阳能电池

多结太阳能电池是迄今为止在太空和陆地应用中展示的效率最高的光伏器件。近年来，基于直接半导体键合技术（SBT）的五结电池表现出>35%的空间效率并呈现出应用潜力。本文阐述了制造 SBT 5J 电池的主要挑战及其涉及结构调谐、能带工程和材料剪裁的适当策略，并介绍了 4-cm ² 35.4% (AM0, one sun) 5J SBT 电池。需要进一步努力进行详细的光学管理，以改善子电池中的电流生成和匹配，以实现 36%–37% 或更高的效率。