Breaking the Bimolecular Crystal: The Effect of Side-Chain Length on Oligothiophene/Fullerene Intercalation

被引:6
作者
Burnett, Edmund K. [1 ]
Cherniawski, Benjamin P. [1 ]
Rosa, Stephen J. [1 ]
Smilgies, Detlef-M. [2 ]
Parkin, Sean [3 ]
Briseno, Alejandro L. [1 ]
机构
[1] Univ Massachusetts, Polymer Sci & Engn, 120 Governors Dr, Amherst, MA 01003 USA
[2] Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14850 USA
[3] Univ Kentucky, Dept Chem, Lexington, KY 40506 USA
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
HETEROJUNCTION SOLAR-CELLS; DONOR-ACCEPTOR HETEROJUNCTIONS; POLYMER-FULLERENE BLENDS; X-RAY-SCATTERING; SEMICONDUCTING POLYMERS; ORGANIC PHOTOVOLTAICS; MOLECULAR PACKING; CHARGE-TRANSPORT; MORPHOLOGY; MANIPULATION;
D O I
10.1021/acs.chemmater.7b04702
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Polymer/fullerene bimolecular crystal formation has been investigated using a variety of conjugated polymers and fullerenes to understand the design rules that influence donor acceptor interaction. Modifications of the polymer by varying the substitution side-chain position, density, and branching have demonstrated the importance of the "pocket" dimensions (free volume between side chains where the fullerene resides) for controlling intercalation. Yet the effect of pocket height has not been systematically explored because of the solubility limitations in polymers. In this report, we present an experimental investigation into the effect of the pocket height by synthesizing poly[2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene] dimers with varied side chain lengths and track the morphological changes of the dimer/fullerene using grazing-incidence X-ray scattering, thermal measurements, and photoluminescence quenching. We identify two regimes: (1) oligomers with side chains greater than or equal to heptyl (C7) form bimolecular crystals and (2) oligomers with less than or equal to hexyl (C6) form amorphous blends. This work provides the first observation of an order-to-disorder transition mediated by side-chain length in donor-fullerene intercalated blends.
引用
收藏
页码:2550 / 2556
页数:7
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