Open Access
Enhancement of Field-Effect Mobility by Surface-Mediated Molecular Ordering in Regioregular Polythiophene Thin Film Transistor
Do Hwan Kim,Yeongdon Park,Yunseok Jang,Hoichang Yang,Kilwon Cho,Soo-Jin Park,Taihyun Chang,Chang Y. Ryu +7 more
- Vol. 2004
TLDR
In this paper, a self-aligned regioregular poly(3-hexylthiophene) (P3HT) has been used to control the intermolecular interaction at the interface between P3HT and the insulator substrate by using self-assembled monolayers (SAMs) functionalized with various groups (NH2, NH2, OH, and CH3).Abstract:
With the aim of enhancing the field-effect mobility by promoting surface-mediated two-dimensional molecular ordering in self-aligned regioregular poly(3-hexylthiophene) (P3HT) we have controlled the intermolecular interaction at the interface between P3HT and the insulator substrate by using self-assembled monolayers (SAMs) functionalized with various groups (–NH2, –OH, and –CH3). We have found that, depending on the properties of the substrate surface, the P3HT nanocrystals adopt two different orientations—parallel and perpendicular to the insulator substrate—which have field-effect mobilities that differ by more than a factor of 4, and that are as high as 0.28 cm2 V–1 s–1. This surprising increase in field-effect mobility arises in particular for the perpendicular orientation of the nanocrystals with respect to the insulator substrate. Further, the perpendicular orientation of P3HT nanocrystals can be explained by the following factors: the unshared electron pairs of the SAM end groups, the π–H interactions between the thienyl-backbone bearing π-systems and the H (hydrogen) atoms of the SAM end groups, and interdigitation between the alkyl chains of P3HT and the alkyl chains of the SAMs.read more
Citations
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Device Physics of Solution‐Processed Organic Field‐Effect Transistors
TL;DR: In this article, the materials, charge-transport, and device physics of solution-processed organic field-effect transistors are reviewed, focusing in particular on the physics of the active semiconductor/dielectric interface.
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Recent advances in solution-processed interfacial materials for efficient and stable polymer solar cells
TL;DR: In this paper, the authors provide an overview on the recent development of solution processed organic, inorganic, and hybrid interfacial materials for bulk-heterojunction polymer solar cells.
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Side Chain Engineering in Solution-Processable Conjugated Polymers
Jianguo Mei,Zhenan Bao +1 more
TL;DR: In this paper, side chains in conjugated polymers have been used to tune a polymer's physical properties, including absorption, emission, energy level, molecular packing, and charge transport.
Journal ArticleDOI
Highly oriented crystals at the buried interface in polythiophene thin-film transistors
TL;DR: In this paper, the authors used X-ray diffraction rocking curves to provide direct evidence for highly oriented crystals at the critical buried interface between the polymer and the dielectric where the current flows in thin-film transistors.
Journal ArticleDOI
Controlling the Morphology and Performance of Bulk Heterojunctions in Solar Cells. Lessons Learned from the Benchmark Poly(3-hexylthiophene):[6,6]-Phenyl-C61-butyric Acid Methyl Ester System
TL;DR: Heterojunctions in Solar Cells: Lessons Learned from the Benchmark Poly(3-hexylthiophene):[6,6]-Phenyl‐C61-butyric Acid Methyl Ester System Minh Trung Dang.
References
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