Abstract Perylene diimide derivatives (PDIs) are a kind of very promising non-fullerene electron transport material for organic-inorganic perovskite solar cells (PerSCs), owing to their excellent photoelectric properties and low-cost synthesis. However, their tendency to form aggregates strongly influences the film morphology and transport properties. Herein, we provided a simple way to tune the morphology and transport properties of PDIs by solvent additive engineering. A series of solvent additives (1,8-diiodooctane, 1-chloronaphthalene, 1-phenylnaphthalene, 1-methylnaphthalene) was investigated for their role in the morphology and transport property of PDI dimer (Bis-PDI-T-EG) film as well as on the photovoltaic performance of PerSCs. Among these four solvent additives, 1-methylnaphthalene (MN) was found one of the best additive that possesses good adjusting ability to control both morphological and electrical properties of Bis-PDI-T-EG film. The fabricated PerSCs with optimized Bis-PDI-T-EG + 0.05 v/v% MN electron transport layer (ETL) displayed the best power conversion efficiency (PCE) of 14.96%. The performance of PerSCs was further improved by adding 0.05 wt% graphene together with 0.05 v/v% MN, and the maximum PCE of 15.11% was achieved.

中文翻译：

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溶剂添加剂对钙钛矿太阳能电池中苝二酰亚胺二聚体薄膜形态和传输性能的影响以提高性能

摘要 苝二亚胺衍生物（PDI）由于其优异的光电性能和低成本的合成，是一种非常有前途的非富勒烯电子传输材料，用于有机-无机钙钛矿太阳能电池（PerSCs）。然而，它们形成聚集体的倾向强烈影响薄膜形态和传输性能。在此，我们提供了一种通过溶剂添加剂工程调整 PDI 的形态和传输特性的简单方法。研究了一系列溶剂添加剂（1,8-二碘辛烷、1-氯萘、1-苯基萘、1-甲基萘）对 PDI 二聚体 (Bis-PDI-T-EG) 膜的形态和传输性能的作用如 PerSCs 的光伏性能。在这四种溶剂添加剂中，1-甲基萘 (MN) 被发现是最好的添加剂之一，它具有良好的调节能力，可以控制 Bis-PDI-T-EG 薄膜的形态和电学性能。具有优化的 Bis-PDI-T-EG + 0.05 v/v% MN 电子传输层 (ETL) 的制造的 PerSC 显示出 14.96% 的最佳功率转换效率 (PCE)。通过添加 0.05 wt% 石墨烯和 0.05 v/v% MN 进一步提高了 PerSCs 的性能，并实现了 15.11% 的最大 PCE。