Department of Chemistry and Energy Institute , The Hong Kong University of Science and Technology , Clear Water Bay , Kowloon 999077 , Hong Kong.
Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Faculty of Materials & Energy , Southwest University , Chongqing 400715 , P. R. China.
ACS Appl Mater Interfaces. 2018 Oct 24;10(42):36549-36555. doi: 10.1021/acsami.8b12675. Epub 2018 Oct 9.
An n-type conjugated polymer NDP-V [poly(naphthodiperylenetetraimide-vinylene)] with a backbone of alternating naphthodiperylenetetraimide and vinylene is successfully used as an efficient electron-transporting layer (ETL) material in inverted planar perovskite solar cells (PSCs). It was found that device based on NDP-V exhibits a maximum power conversion efficiency (PCE) of 16.54%, whereas a maximum PCE of 15.27% is obtained based on the fullerene derivative [6,6]-phenyl-C-butyric acid methyl ester (PCBM). The interfacial effect induced by NDP-V is studied using atomic force microscopy images, and NDP-V ensures good selective contact between the perovskite material and the metal electrode. Through steady-state and time-resolved photoluminescence, we find that NDP-V acts as an efficient electron extraction material. Additionally, compared with PCBM, NDP-V shows higher electron mobility, more hydrophobicity, and compatible energy levels with perovskite materials, thus providing higher device performance and better device stability. This work highlights the great potential of perylenediimide derivatives to replace the most popular PCBM ETL for inverted PSCs.
一种 n 型共轭聚合物 NDP-V [聚（萘二酰亚二对苯二亚胺-亚乙烯基）]，其主链由交替的萘二酰亚二对苯二亚胺和亚乙烯基组成，成功用作倒置平面钙钛矿太阳能电池（PSC）中的高效电子传输层（ETL）材料。研究发现，基于 NDP-V 的器件表现出 16.54%的最高功率转换效率（PCE），而基于富勒烯衍生物[6,6]-苯基-C-丁酸甲酯（PCBM）的器件最高 PCE 为 15.27%。使用原子力显微镜图像研究了 NDP-V 引起的界面效应，NDP-V 确保了钙钛矿材料和金属电极之间的良好选择性接触。通过稳态和时间分辨光致发光，我们发现 NDP-V 是一种有效的电子提取材料。此外，与 PCBM 相比，NDP-V 具有更高的电子迁移率、疏水性和与钙钛矿材料兼容的能级，从而提供更高的器件性能和更好的器件稳定性。这项工作强调了苝二酰亚二胺衍生物取代最流行的 PCBM ETL 用于倒置 PSCs 的巨大潜力。
