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- Title
Synthesis and photovoltaic properties of new near infrared absorption polymers based on C and N-bridged dithiophene and diketopyrrolopyrrole units.
- Authors
Deng, Dan; Gu, Li
- Abstract
Two novel diketopyrrolopyrrole-based conjugated copolymers, namely, poly{[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-diyl]-alt-[3,6-bis(bithiophen-5-yl)-2,5-di-(2-ethylhexyl)-pyrrolo[3,4-c]pyrrole-1,4-dione]} ( P1) and poly{[ N-(2-ethylhexyl)-dithieno[3,2-b:2′,3′-d]pyrrole-2,6-diyl]-alt-[3,6-bis(bithiophen-5-yl)-2,5-di-(2-ethylhexyl)-pyrrolo[3,4-c]pyrrole-1,4-dione]} ( P2), have been designed and synthesized by Stille coupling reaction. The resulting copolymers exhibited very broad and strong absorptions in the visible and near-infrared region. Through cyclic voltammetry measurements, it was found that P1 possesses a lower highest occupied molecular orbital energy level (−5.14 eV) compared to that of P2 (−4.98 eV). The bulk heterojunction photovoltaic devices were fabricated by using the two copolymers as the donor and [6,6]-phenyl-C-butyric acid methyl ester (PCBM) as the acceptor in the active layer. The maximum power conversion efficiency of 1.48 % was obtained based on the blend of P1:PCBM = 1:3(w/w) with open circuit voltage ( V) of 0.66 V and short circuit current ( J) of 6.36 mA/cm, under the illumination of AM 1.5, 100 mW/cm.
- Subjects
PHOTOVOLTAIC power generation; OPEN-circuit voltage; INFRARED absorption; CONJUGATED polymers; ATOMIC orbital energy; VOLTAMMETRY
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 8, p3029
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1207-1