Molecular Weight Dependence of Chain Packing and Semicrystalline Structure in Oriented Films of Regioregular Poly(3-hexylthiophene) Revealed by High-Resolution Transmission Electron Microscopy

被引:228
作者
Brinkmann, Martin [1 ]
Rannou, Patrice [2 ]
机构
[1] Inst Charles Sadron, F-67083 Strasbourg, France
[2] Univ Grenoble 1, Lab Elect Mol Organ & Hybride, SPrAM, CNRS,CEA,INAC,CEA Grenoble,UMR5819, F-38054 Grenoble 9, France
关键词
FIELD-EFFECT MOBILITY; POLYMER SOLAR-CELLS; THIN-FILMS; SEMICONDUCTING POLYMERS; CRYSTALLINE-STRUCTURE; CHARGE-TRANSPORT; MORPHOLOGY; ORIENTATION; INTERFACE; SUBSTRATE;
D O I
10.1021/ma8023415
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The semicrystalline structure of regioregular head-to-tail- (HT-) Coupled poly(3-hexylthiophene-2,5-diyl) (Rr-P3HT) thin films grown by directional epitaxial solidification (DES) has been studied by high-resolution transmission electron microscopy (HR-TEM). A 10-fold increase of the weight-average molecular weight of the Rr-P3HT leads to several major structural changes: (i) an increase of the fluctuations of the lamellar thickness while preserving the average length of the polymer stems in the crystalline domains; (ii) all increase of the disorder in the crystalline packing of Rr-P3HT chains, (iii.) an enhanced interconnectivity between crystalline lamellae via tie-crystallites and tie-chains; (iv) for M-w >= 18.8 kDa equiv PS, preferential tilt angles of the polymer chains in the crystalline lamellae. Similar to stiff-chain polymers like poly(etheretherketone), the concomitant increase of the interchain distance (i.e., the a parameter in the unit cell) and the tilting of Rr-P3HT chains in the crystalline lamellae are attributed to chain folding exerting stress on the crystal packing because of the stiffness of comb-shaped Rr-P3HT chains.
引用
收藏
页码:1125 / 1130
页数:6
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