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http://dx.doi.org/10.17702/jai.2019.20.4.155

Interfacial Charge Transport Anisotropy of Organic Field-Effect Transistors Based on Pentacene Derivative Single Crystals with Cofacial Molecular Stack  

Choi, Hyun Ho (School of Materials Science and Engineering, Gyeongsang National University)
Publication Information
Journal of Adhesion and Interface / v.20, no.4, 2019 , pp. 155-161 More about this Journal
Abstract
Understanding charge transport anisotropy at the interface of conjugated nanostructures basically gives insight into structure-property relationship in organic field-effect transistors (OFET). Here, the anisotropy of the field-effect mobility at the interface between 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) single crystal with cofacial molecular stacks in a-b basal plane and SiO gate dielectric was investigated. A solvent exchange method has been used in order for TIPS-pentacene single crystals to be grown on the surface of SiO2 thin film, corresponding to the charge accumulation at the interface in OFET structure. In TIPS-pentacene OFET, the anisotropy ratio between the highest and lowest measured mobility is revealed to be 5.2. By analyzing the interaction of a conjugated unit in TIPS-pentacene with the nearest neighbor units, the mobility anisotropy can be rationalized by differences in HOMO-level coupling and hopping routes of charge carriers. The theoretical estimation of anisotropy based on HOMO-level coupling is also consistent with the experimental result.
Keywords
organic field-effect transistor; mobility anisotropy; TIPS-pentacene; cofacial stack;
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