NDLI: Isoindigo-based low bandgap conjugated polymer for <i>o</i>-xylene processed efficient polymer solar cells with thick active layers

Content Provider	Royal Society of Chemistry (RSC)
Author	Deng, Yunfeng Xie, Zhiyuan Geng, Yanhou Dong, Xin Wang, Fosong Tian, Hongkun
Copyright Year	2015
Abstract	A low bandgap conjugated polymer, i.e., poly[2,2′-bithiophene-alt-7-fluoro-N,N′-bis(2-octyldodecyl)isoindigo] (P(1FIID-BT)), was synthesized. The polymer was soluble in non-chlorinated solvents such as o-xylene and mesitylene, and exhibited a film optical bandgap of 1.61 eV as calculated from the absorption onset and a deep highest occupied molecular orbital (HOMO) energy level of −5.46 eV as measured by an electrochemical method. Remarkably high mobilities of 0.33 and 0.42 cm2 V−1 s−1 were obtained for organic field-effect transistors (OFETs) based on pristine and annealed films, respectively. Inverted polymer solar cells (PSCs) were fabricated with phenyl-C61-butyric acid methyl ester (PC61BM) as the acceptor material and o-xylene as the processing solvent. The device efficiency was insensitive to the thickness of the active layer, and all devices with film thickness in the range of 105–340 nm showed a power conversion efficiency (PCE) higher than 6.5%. The devices based on 270 nm thick films displayed the highest performance with a VOC of 0.89 V, a JSC of 14.50 mA cm−2 and a FF of 0.58, leading to a PCE of 7.46%. This is the first low bandgap conjugated polymer for PSCs which combine three features: non-chlorinated solvent processability, high efficiency and insensitivity of efficiency to the active layer thickness.
Starting Page	19928
Ending Page	19935
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	39
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta05352h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	JSC Band gap Polymer O-Xylene Mesitylene Electronvolt Molecular orbital Electrochemistry Phenyl-C61-butyric acid methyl ester Acid Ester Solvent Open-circuit voltage
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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