Solution-Processed Monolithic All-Perovskite Triple-Junction Solar Cells with Efficiency Exceeding 20%
Ke Xiao, Jin Wen, Qiaolei Han, Renxing Lin, Yuan Gao, Shuai Gu, Yipeng Zang, Yuefeng Nie, Jia Zhu, Jun Xu, Hairen Tan
Abstract
Very high power conversion efficiencies (PCEs) have been demonstrated by multijunction cells made of epitaxial III–V semiconductors; but they are too expensive to manufacture for terrestrial applications. Multijunction solar cells that can be fabricated with cheap and simple solution-processing techniques offer a lower-cost alternative to reach high PCEs. Here we demonstrate the solution processing of efficient all-perovskite triple-junction solar cells using optimal-bandgap perovskites. Monolithic all-perovskite triple-junction cells with an open-circuit voltage of 2.8 V and a fill factor of 81.1% are obtained by developing interconnecting layers that are compatible with the solution processing of perovskite absorbers. The concept and design here represent an important step toward efficient all-perovskite triple-junction solar cells.