Organic Solar Cells with Over 19% Efficiency Enabled by a 2D-Conjugated Non-fullerene Acceptor Featuring Favorable Electronic and Aggregation Structures

被引：134

作者：

Liu, Kerui ^{[1
,2
,3
]}

Jiang, Yuanyuan ^{[1
,2
,3
]}

Liu, Feng ^{[1
,2
]}

Ran, Guangliu ^{[4
,5
]}

Huang, Fei ^{[6
]}

Wang, Wenxuan ^{[1
,2
,3
]}

Zhang, Wenkai ^{[4
,5
]}

Zhang, Cheng ^{[6
]}

Hou, Jianhui ^{[1
,2
,3
]}

Zhu, Xiaozhang ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China

[4] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

[5] Beijing Normal Univ, Ctr Adv Quantum Studies, Appl Opt Beijing Area Major Lab, Beijing 100875, Peoples R China

[6] Sichuan Univ, Coll Chem, Key Lab Green Chem & Technol, Minist Educ, Chengdu 610064, Peoples R China

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 32期

基金：

中国国家自然科学基金;

关键词：

2D & pi; -expansion; non-fullerene acceptors; organic alloyed semiconductors; power conversion efficiency; single-crystal analysis; ternary organic solar cells; transfer integral;

D O I：

10.1002/adma.202300363

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The p-expansion of non-fullerene acceptors is a promising method for boosting the organic photovoltaic performance by allowing the fine-tuning of electronic structures and molecular packing. In this work, highly efficient organic solar cells (OSCs) are fabricated using a 2D p-expansion strategy to design new non-fullerene acceptors. Compared with the quinoxaline-fused cores of AQx-16, the p-expanded phenazine-fused cores of AQx-18 induce more ordered and compact packing between adjacent molecules, affording an optimized morphology with rational phase separation in the blend film. This facilitates efficient exciton dissociation and inhibited charge recombination. Consequently, a power conversion efficiency (PCE) of 18.2% with simultaneously increasing V-oc, J(sc), and fill factor is achieved in the AQx-18-based binary OSCs. Significantly, AQx-18-based ternary devices fabricated via a two-in-one alloy acceptor strategy exhibit a superior PCE of 19.1%, one of the highest values ever reported for OSCs, along with a high V-oc of 0.928 V. These results indicate the importance of the 2D p-expansion strategy for the delicate regulation of the electronic structures and crystalline behaviors of the non-fullerene acceptors to achieve superior photovoltaic performance, aimed at significantly promoting further development of OSCs.

引用

页数：11