The Effects of Crystallinity on Charge Transport and the Structure of Sequentially Processed F4TCNQ-Doped Conjugated Polymer Films

被引:219
作者
Scholes, D. Tyler [1 ]
Yee, Patrick Y. [1 ]
Lindemuth, Jeffrey R. [2 ]
Kang, Hyeyeon [1 ]
Onorato, Jonathan [3 ]
Ghosh, Raja [4 ]
Luscombe, Christine K. [3 ]
Spano, Frank C. [4 ]
Tolbert, Sarah H. [1 ,5 ,6 ]
Schwartz, Benjamin J. [1 ,6 ]
机构
[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[2] Lake Shore Cryotron, Westerville, OH 43082 USA
[3] Univ Washington, Mat Sci & Engn Dept, Seattle, WA 98195 USA
[4] Temple Univ, Dept Chem, Philadelphia, PA 19122 USA
[5] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
[6] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA
基金
美国国家科学基金会;
关键词
charge transport; doping; Hall Effect; morphology; semiconducting polymers; REGIOREGULAR POLY(3-HEXYLTHIOPHENE); BULK-HETEROJUNCTION; THIN-FILMS; ELECTRICAL-PROPERTIES; CONDUCTING POLYMERS; PHOTOVOLTAIC CELLS; DOPING EFFICIENCY; HOPPING TRANSPORT; MOLECULAR-WEIGHT; SOLAR-CELL;
D O I
10.1002/adfm.201702654
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The properties of molecularly doped films of conjugated polymers are explored as the crystallinity of the polymer is systematically varied. Solution sequential processing (SqP) was used to introduce 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F(4)TCNQ) into poly(3-hexylthiophene-2,5-diyl) (P3HT) while preserving the pristine polymer's degree of crystallinity. X-ray data suggest that F(4)TCNQ anions reside primarily in the amorphous regions of the film as well as in the P3HT lamellae between the side chains, but do not-stack within the polymer crystallites. Optical spectroscopy shows that the polaron absorption redshifts with increasing polymer crystallinity and increases in cross section. Theoretical modeling suggests that the polaron spectrum is inhomogeneously broadened by the presence of the anions, which reside on average 6-8 angstrom from the polymer backbone. Electrical measurements show that the conductivity of P3HT films doped by F(4)TCNQ via SqP can be improved by increasing the polymer crystallinity. AC magnetic field Hall measurements show that the increased conductivity results from improved mobility of the carriers with increasing crystallinity, reaching over 0.1 cm(2) V-1 s(-1) in the most crystalline P3HT samples. Temperature-dependent conductivity measurements show that polaron mobility in SqP-doped P3HT is still dominated by hopping transport, but that more crystalline samples are on the edge of a transition to diffusive transport at room temperature.
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页数:13
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