Details

Autor(en) / Beteiligte

• Fu, Huiting
• Meng, Dong
• Meng, Xiangyi
• Sun, Xiaobo
• Huo, Lijun
• Fan, Yuzun
• Li, Yan
• Ma, Wei
• Sun, Yanming
• Wang, Zhaohui

Titel

Influence of alkyl chains on photovoltaic properties of 3D rylene propeller electron acceptors

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2017, Vol.5 (7), p.3475-3482

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A series of propeller-shaped triperylene hexaimide (TPH) non-fullerene acceptors, featuring branched alkyl side chains with different lengths (TPH-4, TPH-5, TPH-6, and TPH-7), have been designed and synthesized. The effects of the branched alkyl chain length on the physical properties, thin-film microstructure, molecular packing, charge transport and the resulting photovoltaic properties of these materials have been systematically investigated. It was found that TPH-7 with the longest alkyl side chain showed the best photovoltaic performance compared with three other TPH molecules, and an outstanding power conversion efficiency (PCE) of 8.6% under AM 1.5G irradiation (100 mW cm-2) has been obtained using a wide-band-gap polymer PDBT-T1 as the electron donor. These results demonstrate that finely tailoring alkyl substituents on TPH-based small molecular acceptors critically impacts the structural order of thin films and molecular orientation, and thus the photovoltaic performance.