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The Application Of Insulating Substrate Surface Modification In Organic Thin-film Transistors

Posted on:2015-01-20Degree:MasterType:Thesis
Country:ChinaCandidate:X F XiongFull Text:PDF
GTID:2268330428959408Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
There has been increased interest in inkjet printing technique to theadvantages of low-cost preparation, non contact pattering method, and availableflexibility. Inkjet printing of organic thin film transistors is an enablingtechnology for many applications requiring low-cost electronics such asdisplays. The purpose of the study is to prepare high performance organicthin-film transistors with inkjet printed active layer films.In this thesis, we examine specifcally the correlation between the flmmorphology of a small molecule semiconductor TIPS-pentacece and surfaceproperties of the oxide substrate that can be characterized with surface energymeasurement. OTFTs with inkjet printed TIPS-pentacene as well as C10-BTBTfilms as the active layers have been prepared, and the main contents include:(1)inkjet printed TIPS-pentacene arrayed isolating dots and thin flms hadbeen deposited on modified substrate after three different kind of surfacetreatment metheds including solvent cleaning, spin-coated hexamethyldisilazane(HMDS) and UV-ozone cleaning. The correlation between the flm morphologyof TIPS-pentacene and surface properties of the substrate that could becharacterized with surface energy measurement. The result showes that themorphology of TIPS-pentacene flms have been closely related to the dispersivecomponent of surface energy.(2)Inkjet printed TIPS-pentacene arrayed isolating dots and thin flms weredeposited on PVP modified substrate and SiO2substrate, then organic thin-filmtransistors were fabricated. Compared with the TIPS-pentacene filmsinkjet-printed on the controlled SiO2substrate without PVP modification layer,the single-drop semiconductor films deposited on the PVP-modified substrateshow much reduced coffee-ring effect and therefore better film uniformity,while large-area films with rectangular pattern printed with overlappingmulti-drop shows larger grain size and the corresponding OTFTs also exhibitsenhanced field-effect mobility. (2)Thin films of C10-BTBT, a new semiconductor material, were deposited onPVP modified substrate by inkjet printing respectively with single nozzle and3-nozzle. The result showed that large-area films printed with3-nozzle obtainedbetter continuity of crystallization, and the corresponding OTFTs also exhibitedhigh field-effect mobility and environmental stability.
Keywords/Search Tags:organic thin-film transistors, inkjet printing, organic semiconductor, surface modification
PDF Full Text Request
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