Dominant Face‐On Oriented Perylene‐Diimide Interlayers for High‐Performance Organic Solar Cells

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Angewandte Chemie International Edition Pub Date : 2025-02-18 DOI:10.1002/anie.202424502
Zhihui Chen, Qi Li, Huijun Tang, Junjie Wen, Yanyi Zhong, Jiangbin Zhang, Kai Han, Yao Liu
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Abstract

Electron transport properties of cathode interlayers are crucial to high‐performance organic solar cells (OSCs). We propose a novel approach to enhance electron transport of cathode interlayers through controlling a preferential face‐on molecular orientation of non‐ionic perylene‐diimide‐ (PDI) based cathode interlayers with restricted n‐doping effects. 1‐(2,5,8‐trioxadec‐10‐yl)‐1,2,3‐triazole (TOT) units as bulky and extended side chains were incorporated into brominated‐PDIs via click chemistry to yield PDIBr‐TOT. TOT side chains impart PDI‐based interlayers with a dominant face‐on orientation, meanwhile leading to a negligible doping effect due to their weak electron‐donating properties. Impressively, at a slight doping level, higher electron mobility is gained through efficient vertical charge transport channels built by preferred face‐on molecular orientations of PDIBr‐TOT, beating the results acquired through strong doping effects of traditional PDIBr‐N with an edge‐on orientation. Thus, PDIBr‐TOT can suppress exciton recombination and lower the surface energies for good contact with active layers, consequently leading to increases in fill factor and short‐circuit current. Integrating PDIBr‐TOT with various active layers, a remarkable efficiency of 19.52% is obtained. Moreover, device stability is enhanced by restrained doping effects. Modulating face‐on orientations of cathode interlayers prescribed here will encourage further innovative designs of high‐performance cathode interlayers towards OSC advances.
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阴极夹层的电子传输特性对高性能有机太阳能电池(OSC)至关重要。我们提出了一种新方法,通过控制非离子型过烯-二亚胺(PDI)阴极夹层的优先面朝上分子取向来提高阴极夹层的电子传输性能,同时限制正掺杂效应。通过点击化学反应,1-(2,5,8-三氧杂十-10-基)-1,2,3-三唑(TOT)单元作为笨重的扩展侧链被加入溴化 PDI 中,从而产生 PDIBr-TOT。TOT 侧链赋予基于 PDI 的夹层以正面朝上的主导取向,同时由于其弱的电子捐献特性,掺杂效应可以忽略不计。令人印象深刻的是,在轻微的掺杂水平下,通过 PDIBr-TOT 优选的面朝上分子取向所建立的高效垂直电荷传输通道,可获得更高的电子迁移率,优于传统 PDIBr-N 边朝上取向的强掺杂效应所获得的结果。因此,PDIBr-TOT 可以抑制激子重组,降低表面能量,从而与有源层保持良好接触,进而提高填充因子和短路电流。将 PDIBr-TOT 与各种有源层结合,可获得 19.52% 的出色效率。此外,抑制掺杂效应还增强了器件的稳定性。本文提出的阴极夹层面朝上方向的调节方法将促进高性能阴极夹层的进一步创新设计,从而推动 OSC 的发展。
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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