Journal
CHEMICAL SCIENCE
Volume 7, Issue 7, Pages 4301-4307Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc04783h
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Funding
- National Natural Science Foundation of China (NSFC) [91222201, 91333206, 51473139, 51473053]
- Hong Kong Research Grants Council [HKBU 22304115, HKBU 203011]
- Hong Kong Baptist University [FRG2/14-15/034, FRG1/14-15/058, FRG2/13-14/083]
- Areas of Excellence Scheme, University Grants Committee, Hong Kong SAR [AoE/P-03/08]
- Science, Technology and Innovation Committee of Shenzhen Municipality [JCYJ20150630164505504]
- International Science & Technology Cooperation Program of China [2013DFG52740]
- project of Innovation Platform Open Foundation of University of Hunan Province [14K092]
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Porphyrin-based small molecules as donors have long been ignored in bulky heterojunction organic solar cells due to their unfavorable aggregation and the low charge mobility. With the aim of striking a delicate balance between molecular design, morphology, interfacial layer and device fabrication to maximize the power conversion efficiency (PCE) of organic solar cells, three comparable porphyrin-based small molecules with an acceptor-donor-acceptor configuration have been developed for use as donor materials in solution processed small molecule bulk heterojunction organic solar cells. In these molecules, electron-deficient 3-ethylrhodanine is introduced into the electron-rich porphyrin core through 5,15-bis(phenylethynyl) linkers. Structural engineering with 10,20-bis(2-hexylnonyl) aliphatic peripheral substituent on the porphyrin core, instead of the aromatic substituents such as 10,20-bis[3,5di(dodecyloxyl)phenyl], and 10,20-bis(4-dodecyloxylphenyl), can simultaneously facilitate stronger intermolecular pi-pi stacking and higher charge transfer mobility in the film, leading to a maximum PCE of 7.70% in a conventional device. The inverted devices have also been demonstrated to have long-term ambient stability and a comparable PCE of 7.55%.
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