Influence of Fullerene Grafting Density on Structure, Dynamics, and Charge Transport in P3HT-b-PPC61BM Block Copolymers

被引：25
作者：
Hufnagel, Martin [1 ]
Fischer, Matthias [2 ]
Thurn-Albrecht, Thomas [2 ]
Thelakkat, Mukundan [1 ]
机构：
[1] Univ Bayreuth, Dept Macromol Chem 1, Appl Funct Polymers, Univ Str 30, D-95440 Bayreuth, Germany
[2] Univ Halle Wittenberg, Expt Polymer Phys Grp, Von Danckelmann Pl 3, D-06120 Halle, Germany
来源：
MACROMOLECULES | 2016年 / 49卷 / 05期
关键词：
HETEROJUNCTION SOLAR-CELLS; POLYMER PHOTOVOLTAIC CELLS; ROD-COIL; THERMAL-PROPERTIES; POLY(3-HEXYLTHIOPHENE); MORPHOLOGY; CRYSTALLIZATION; SEPARATION; MECHANISM; MOBILITY;
D O I：
10.1021/acs.macromol.5b02276
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A series of tailor-made poly(3-hexylthiophene)-block-PPCBM (P3HT-b-PPCBM) block copolymers incorporating P3HT as donor and a polystyrene with pendant fullerenes (PC61BM) as acceptor block (PPCBM) is presented. The grafting density of PC61BM was varied between 26 and 60 wt %. This has high impact on structure formation, molecular dynamics, and charge transport. It causes considerable increase in glass transition temperature (T-g from 150 to 200 degrees C). The Tg of the amorphous PPCBM block restricts the dynamics of structure evolution of the block copolymer resulting in an incomplete microphase separation, although structural studies revealed a donor-acceptor nanostructure of 30-40 nm in bulk and thin films. All block copolymers exhibit ambipolar charge transport in organic field-effect transistors. Further, the most densely grafted system showed 2 orders of magnitude higher electron mobility. Thus, the fullerene grafting density turned out as a key parameter in designing P3HT-b-PPCBM systems for tuning phase separation and charge transport.
引用
收藏
页码：1637 / 1647
页数：11
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