Effects of block length in copolymers based on regioregular oligothiophenes linked with electron-accepting units.
Copolymers with an alternating structure of regioregular oligo(3-hexylthiophene) (O3HT) with different lengths and 2,5-dibutyl-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (DPP) were synthesized through Stille coupling reaction. The light absorption of the copolymers can be rationally tuned to have a broad spectrum across the visible region by adjusting the length of O3HT. Organic solar cells fabricated with the copolymers and PCBM showed a broad photoresponse and a comparable efficiency to that of poly(3-hexylthiophene) (P3HT):PCBM cells. The external quantum efficiency and fluorescence spectra suggested that the intrachain energy transfer from the O3HT block to the vicinity of the DPP unit could limit the photovoltaic performance of the copolymers.
Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Luozheng
L
Zhang
Yue
Y
Zhang
Qingshuo
Q
Wei
Erjun
E
Zhou
Chunhe
C
Yang
Kazuhito
K
Hashimoto
Keisuke
K
Tajima
D004583:Electrons; D004735:Energy Transfer; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry
D011108:Polymers; D011137:Polystyrenes; D013876:Thiophenes; D017971:Tin Compounds; C533756:poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate); C507295:poly(3-hexylthiophene); C109984:indium tin oxide