A design strategy is proposed for electron‐transporting materials (ETMs) with homochiral asymmetric‐shaped groups for highly efficient non‐fullerene perovskite solar cells (PSCs). The electron transporting N,N′‐bis[(R)‐1‐phenylethyl]naphthalene‐1,4,5,8‐tetracarboxylic diimide (NDI‐PhE) consists of two asymmetric‐shaped chiral (R)‐1‐phenylethyl (PhE) groups that act as solubilizing groups by reducing molecular symmetry and increasing the free volume. NDI‐PhE exhibits excellent film‐forming ability with high solubility in various organic solvents [about two times higher solubility than the widely used fullerene‐based phenyl‐C₆₁‐butyric acid methyl ester (PCBM) in o‐dichlorobenzene]. NDI‐PhE ETM‐based inverted PSCs exhibit very high power conversion efficiencies (PCE) of up to 20.5 % with an average PCE of 18.74±0.95 %, which are higher than those of PCBM ETM‐based PSCs. The high PCE of NDI‐PhE ETM‐based PSCs may be attributed to good film‐forming abilities and to three‐dimensional isotropic electron transporting capabilities. Therefore, introducing homochiral asymmetric‐shaped groups onto charge‐transporting materials is a good strategy for achieving high device performance.

中文翻译：

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高效非富勒烯钙钛矿太阳能电池的手性不对称形电子传输材料

针对高效非富勒烯钙钛矿型太阳能电池（PSC）的具有同手性不对称形状基团的电子传输材料（ETM），提出了一种设计策略。电子传输N，N'-双[（R）-1-苯乙基]萘-1,4,5,8-四羧酸二酰亚胺（NDI-PhE）由两个不对称形状的手性（R）-1-苯乙基（ PhE）基团通过降低分子对称性和增加自由体积而充当增溶基团。NDI-PhE具有出色的成膜能力，在各种有机溶剂中具有高溶解度[比在邻苯二甲酸酯中广泛使用的基于富勒烯的苯基-C _61-丁酸甲酯（PCBM）高约两倍。-二氯苯]。基于NDI-PhETM的ETM反向PSC的功率转换效率（PCE）高达20.5％，平均PCE为18.74±0.95％，高于基于PCBM ETM的PSC。基于NDI-PhETM的PSC的高PCE可能归因于良好的成膜能力和三维各向同性电子传输能力。因此，将纯手性不对称形状的基团引入电荷传输材料是实现高器件性能的好策略。