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- Title
Novel Cathode Interlayers Based on Neutral Alcohol-Soluble Small Molecules with a Triphenylamine Core Featuring Polar Phosphonate Side Chains for High-Performance Polymer Light-Emitting and Photovoltaic Devices.
- Authors
Chen, Dongcheng; Zhou, Hu; Cao, Yong; Su, Shi-Jian; Zhao, Wei-Ming; Liu, Ming
- Abstract
A new family of neutral alcohol-soluble small molecular materials comprised of electron-rich triphenylamine (TPA) and fluorene featuring phosphonate side chains (FEP) is reported, namely 3TPA-FEP, 2TPA-2FEP and TPA-3FEP, which have different TPA and FEP contents. Due to their good solubility in polar solvents like alcohol, multilayer devices can be fabricated by a wet process from orthogonal solvents. Polymer light-emitting devices with these materials as a cathode interlayer and Al as the cathode show greatly enhanced efficiencies in contrast to control devices without such a cathode interlayer, and their efficiencies are comparable with or even higher than devices with the low work-function metal Ba/Al as the cathode. In addition, high-performance polymer solar cells based on the poly[N-9''-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) system are also achieved with power conversion efficiencies of 7.21%, 6.90% and 6.89%, by utilizing 3TPA-FEP, 2TPA-2FEP and TPA-3FEP as the cathode interlayer, respectively. These efficiencies are also much higher than those for control devices without the cathode interlayer. Although TPA is well-known as a hole-transport unit, the current findings indicate that alcohol-soluble TPA-based small molecules are also a promising cathode interlayer for both electron injection and extraction.
- Subjects
SMALL molecules; TRIPHENYLAMINE; CATHODES; PHOSPHONATES; SUBSTITUENTS (Chemistry); PHOTOVOLTAIC effect
- Publication
Macromolecular Rapid Communications, 2013, Vol 34, Issue 7, p595
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201200812