Real-time structural evolution at the interface of an organic transistor during thermal annealing

被引：13
作者：
机构：
[1] Department of Chemistry, University of Minnesota-Twin Cities, Minneapolis MN 55455
[2] McKetta Department of Chemical Engineering, University of Texas at Austin
来源：
Massari, A.M. (massari@umn.edu) | 1600年 / Royal Society of Chemistry卷 / 02期
基金：
美国国家科学基金会;
关键词：
Differential scanning calorimetry - Molecular orientation - Polymer films - Annealing - Silica;
D O I：
10.1039/c3tc32063d
中图分类号：
学科分类号：
摘要：
Polarization multiplexed vibrational sum frequency generation (PM-VSFG) spectroscopy has been used to monitor the interfacial structure of polymer transistor interfaces in situ during thermal annealing treatments. The evolution of the field-effect carrier mobility is tracked simultaneously with the molecular orientation and ordering of poly(3-hexylthiophene) (P3HT) macromolecules on two different surface types. It is shown that fluorocarbon functionalized silica imparts very different molecular arrangements that avoid kinetic trapping during solution casting. In contrast, bare silica surfaces produce kinetically trapped polymer configurations that can be observed by PM-VSFG to reorient with thermal annealing. The interfacial results are compared to bulk structural changes in P3HT thin films as characterized by differential scanning calorimetry and linear spectroscopies. The electrical performances of these films are more closely correlated with interfacial parameters than the bulk properties of the polymer. In contrast with the bulk measurements, the PM-VSFG studies show that molecules at the organic/dielectric interface are actually less ordered after thermal annealing processes that render them with lower carrier mobilities. This journal is © the Partner Organisations 2014.
引用
收藏
页码：3390 / 3400
页数：10
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