Nanomorphology and Charge Generation in Bulk Heterojunctions Based on Low-Bandgap Dithiophene Polymers with Different Bridging Atoms

被引:165
作者
Morana, Mauro [1 ]
Azimi, Hamed [1 ,4 ]
Dennler, Gilles [2 ]
Egelhaaf, Hans-Joachim [3 ]
Scharber, Markus [1 ]
Forberich, Karen [2 ]
Hauch, Jens [3 ]
Gaudiana, Russell [2 ]
Waller, David [2 ]
Zhu, Zenghuo [2 ]
Hingerl, Kurt [4 ]
van Bavel, Svetlana S. [5 ,6 ]
Loos, Joachim [5 ,6 ]
Brabec, Christoph J. [7 ]
机构
[1] Konarka Austria, A-4040 Linz, Austria
[2] Konarka Technol Inc, Lowell, MA 01852 USA
[3] Konarka Technol GmbH, D-90443 Nurnberg, Germany
[4] Johannes Kepler Univ Linz, Christian Doppler Lab Surface Opt, A-4040 Linz, Austria
[5] Eindhoven Univ Technol, Lab Mat & Interface Chem & Soft Matter, NL-5600 MB Eindhoven, Netherlands
[6] Eindhoven Univ Technol, CryoTEM Res Unit, NL-5600 MB Eindhoven, Netherlands
[7] Univ Erlangen Nurnberg, D-91058 Erlangen, Germany
关键词
BLEND FILMS; PERFORMANCE; ABSORPTION; EFFICIENCY; COMPLEXES; TRANSPORT; DYNAMICS;
D O I
10.1002/adfm.200900931
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Carbon bridged (C-PCPDTBT) and silicon-bridged (Si-PCPDTBT) dithiophene donor acceptor copolymers belong to a promising class of low bandgap materials. Their higher field-effect mobility, as high as 10(-2)cm(2) V(-1)s(-1) in pristine films, and their more balanced charge transport in blends with fullerenes make silicon-bridged materials better candidates for use in photovoltaic devices. Striking morphological changes are observed in polymer:fullerene bulk heterojunctions upon the substitution of the bridging atom. XRD investigation indicates increased pi-pi stacking in Si-PCPDTBT compared to the carbon-bridged analogue. The fluorescence of this polymer and that of its counterpart C-PC PDTBT indicates that the higher photogeneration achieved in Si-PCPDTBT:fullerene films (with either [C60]PCBM or [C70]PCBM) can be correlated to the inactivation of a charge-transfer complex and to a favorable length of the donor acceptor phase separation. TEM studies of Si-PCPDTBT:fullerene blended films suggest the formation of an interpenetrating network whose phase distribution is comparable to the one achieved in C-PCPDTBT:fullerene using 1,8-octanedithiol as an additive. In order to achieve a balanced hole and electron transport, Si-PCPDTBT requires a lower fullerene content (between 50 to 60 wt%) than C-PCPDTBT (more than 70 wt%). The Si-PCPDTBT:[C70]PCBM OBHJ solar cells deliver power conversion efficiencies of over 5%.
引用
收藏
页码:1180 / 1188
页数:9
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