Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-04-13 , DOI: 10.1016/j.cej.2020.125062
Helin Wang , Fan Zhang , Zhuohua Li , Junmin Zhang , Jiarong Lian , Jun Song , Junle Qu , Wai-Yeung Wong
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How to design and synthesize interfacial engineered materials that have efficient surface passivation and electron extraction properties is an important problem in the field of optoelectronic materials. Herein, a simple naphthalene imide dimer, namely 2FBT2NDI, is developed by Stille coupling reaction with a high yield, and it is used as interface engineering for inverted perovskite solar cells (PSC). Owing to the existence of intermolecular interactions between MAPbI3 and the 2FBT2NDI layer, the introduction of the interfacial layer can passivate the surface defects of perovskite film and improve interface contact. In addition, 2FBT2NDI exhibits suitable energy levels and high electron mobility because of its large linear conjugated skeleton containing two fluorine atoms, which are beneficial for electron extraction for efficient PSCs. Employing 2FBT2NDI as an interfacial layer, inverted PSCs show a maximum power conversion efficiency of 20.1%, which is over 14% higher than that of the control devices without interfacial layer (17.1%). These results highlight that the naphthalene imide dimer can potentially be used as a commercializable interfacial material for achieving high-performance PSCs.
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萘酰亚胺二聚体作为界面工程:实现高性能钙钛矿太阳能电池的有效策略
如何设计和合成具有有效表面钝化和电子提取特性的界面工程材料是光电材料领域的重要问题。本文中,通过斯蒂勒偶联反应以高收率开发了简单的萘酰亚胺二聚物,即2FBT2NDI,并将其用作倒钙钛矿太阳能电池(PSC)的界面工程。由于MAPbI 3之间存在分子间相互作用和2FBT2NDI层,界面层的引入可以钝化钙钛矿薄膜的表面缺陷并改善界面接触。此外,2FBT2NDI由于具有包含两个氟原子的大线性共轭骨架,因此具有合适的能级和较高的电子迁移率,这对于有效PSC的电子萃取是有益的。使用2FBT2NDI作为界面层,倒置的PSC的最大功率转换效率为20.1%,比没有界面层的控制设备(17.1%)高出14%以上。这些结果表明,萘酰亚胺二聚体可以潜在地用作实现高性能PSC的商业化界面材料。