C-Shape or S-Shape? The Molecular Geometry Control of Fused-Ring Nonfullerene Acceptors for Lower Energy Loss in Organic Solar Cells

被引：17

作者：

Bai, Yuanqing ^{[1
]}

Hong, Ling ^{[1
]}

Dou, Yuejia ^{[1
]}

Zhu, Shengtian ^{[1
]}

Tang, Haoran ^{[1
]}

Liu, Denghui ^{[1
]}

Cao, Yunhao ^{[1
]}

Chen, Jingwen ^{[1
]}

Chen, Shihao ^{[1
]}

Shao, Lin ^{[1
]}

Hu, Zhengwei ^{[1
]}

Tang, Ding ^{[1
]}

Zhang, Kai ^{[1
]}

Su, Shi-Jian ^{[1
]}

Liu, Chunchen ^{[1
]}

Huang, Fei ^{[1
]}

机构：

[1] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangdong Basic Res Ctr Excellence Energy & Inform, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China

来源：

ACS ENERGY LETTERS | 2024年 / 9卷 / 04期

基金：

中国国家自然科学基金;

关键词：

RECOMBINATION; VOLTAGE;

D O I：

10.1021/acsenergylett.4c00043

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

To elucidate the pivotal influence of molecular geometry in fused-ring nonfullerene acceptors (FRNFAs) on material properties and device performance of organic solar cells (OSCs), we designed and synthesized two isomeric molecules C-F and S-F, featuring C-shaped and S-shaped geometries with the acceptor-donor-acceptor conjugated framework. The alteration in geometries demonstrated negligible effects on the optical and electrochemical properties. Significantly, single crystal X-ray crystallography analyses uncovered that C-F exhibited a wave network packing, while S-F favored a linear brick packing with the intermolecular packing of end groups, different from the previously reported three-dimensional (3D) stacking network of C-shaped Y series FRNFAs. Despite the absence of 3D network packing, OSCs utilizing C-F demonstrated a remarkable power conversion efficiency of 17.0%, with lower voltage loss compared to the devices based on S-F. This study further underscores the essential role of the C-shaped geometry in FRNFAs, providing valuable insights for future molecular design for high-performance OSCs.

引用

页码：1786 / 1795

页数：10

共 55 条

[1] Fluorination Effects on Indacenodithienothiophene Acceptor Packing and Electronic Structure, End-Group Redistribution, and Solar Cell Photovoltaic Response [J].