期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201803687
关键词
charge transports; doping; organic semiconductors; UV-visible spectroscopy; X-ray diffraction
类别
资金
- Department of Energy Office of Basic Energy Sciences [DE-SC0016390]
- NSF Graduate Fellowship [DGE-1650114]
- U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
The heterogeneous microstructure of semicrystalline polymers complicates the relationship between their electrical conductivity and carrier concentration. Charge transport models typically describe conductivity with an assumption of uniform doping throughout the material. Here, the evolution in morphology and optoelectronic properties of poly(3-hexylthiophene) (P3HT) is reported as a function of carrier concentration in an organic electrochemical transistor using a polymeric ionic liquid (PIL) as the gate insulator. Operando grazing incidence X-ray scattering reveals that negatively charged ions from the dielectric first infiltrate the amorphous regions of the semiconductor, and then penetrate the crystalline regions at a critical carrier density of 4 x 10(20) cm(-3). Upon infiltration, the crystallites expand by 12% in the alkyl stacking direction and compress by 4% in the pi-pi stacking direction. The change in crystal structure of P3HT correlates with a sharply increasing effective carrier mobility. UV-visible spectroscopy reveals that holes induced in P3HT first reside in the crystalline regions of the polymer, which verifies that a charge carrier need not be in the same physical domain as its associated counterion. The dopant-induced morphological changes of P3HT rationalize the dependence of mobility on carrier concentration, suggesting a phase transition of crystalline regions at high carrier concentration.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据