Multijunction solar cells are effective for increasing the power conversion efficiency beyond that of single-junction cells. Indeed, the highest solar cell efficiencies have been achieved using two or more subcells to adequately cover the solar spectrum. However, the efficiencies of organic multijunction solar cells are ultimately limited by the lack of high-performance, near-infrared absorbing organic subcells within the stack. Here, we demonstrate a tandem cell with an efficiency of 15.0 ± 0.3% (for 2 mm² cells) that combines a solution-processed non-fullerene-acceptor-based infrared absorbing subcell on a visible-absorbing fullerene-based subcell grown by vacuum thermal evaporation. The hydrophilic–hydrophobic interface within the charge-recombination zone that connects the two subcells leads to >95% fabrication yield among more than 130 devices, and with areas up to 1 cm². The ability to stack solution-based on vapour-deposited cells provides significant flexibility in design over the current, all-vapour-deposited multijunction structures.

多结太阳能电池对于提高功率转换效率超过单结电池是有效的。实际上，使用两个或更多子电池来充分覆盖太阳光谱已经实现了最高的太阳能电池效率。但是，有机多结太阳能电池的效率最终受到堆栈中缺乏高性能，近红外吸收性有机子电池的限制。在这里，我们展示了一个串联电池，其效率为15.0±0.3％（对于2 mm ²单元），将溶液处理的基于非富勒烯受体的红外吸收子电池与通过真空热蒸发生长的可见吸收性基于富勒烯的子电池相结合。连接两个子电池的电荷复合区内的亲水-疏水界面可导致130多种器件的制造产率达到95％以上，面积高达1 cm ²。能够基于溶液沉积的电池堆叠解决方案，这为当前的全蒸汽沉积多结结构提供了极大的设计灵活性。