A new fused‐ring electron acceptor FOIC1 is designed and synthesized. FOIC1 exhibits intense absorption in the range of 600–1000 nm, the highest occupied molecular orbital (HOMO)/the lowest unoccupied molecular orbital (LUMO) energy levels of −5.39/−3.99 eV, and electron mobility of 1.8 × 10⁻³ cm² V⁻¹ s⁻¹. Organic solar cells based on sequentially processed heterojunction (SHJ) with an unusual inverted structure are fabricated. Through sequentially spin‐coating polymer donor PTB7‐Th as the bottom layer and acceptor FOIC1 as the top layer, a better vertical phase distribution is formed in this SHJ compared with that in traditional bulk heterojunction (BHJ). In the upper‐half part, a more balanced donor/acceptor distribution is beneficial for exciton dissociation. At the bottom interface, more FOIC1 accumulation is beneficial for exciton generation and charge transport. Overall, the SHJ cells exhibit power conversion efficiency as high as 12.0%, higher than that of the BHJ counterpart (11.0%).

中文翻译：

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具有异常倒置结构的高性能非富勒烯有机太阳能电池

设计并合成了一种新的稠环电子受体FOIC1。FOIC1在600-1000 nm的范围内表现出强烈的吸收，最高占据分子轨道（HOMO）/最低未占据分子轨道（LUMO）能级为-5.39 / -3.99 eV，电子迁移率为1.8×10 ^-3  cm ²  V ^-1  s ^-1。制作了基于具有异常反型结构的顺序处理异质结（SHJ）的有机太阳能电池。与传统的本体异质结（BHJ）相比，通过依次旋涂聚合物供体PTB7-Th作为底层，受主FOIC1作为顶层，可以在该SHJ中形成更好的垂直相分布。在上半部分，更平衡的供体/受体分布有利于激子离解。在底部界面，更多的FOIC1积累对于激子的产生和电荷的传输是有益的。总体而言，SHJ电池的功率转换效率高达12.0％，高于BHJ电池的功率转换效率（11.0％）。