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Effect of substrates on preparation of dissolved PMMA in DMF solution used as a dielectric layer in OTFTs
Author(s)
Tippo, Tossapol
Thanachayanont, Chachana
Junin, Chabaiporn
Prichanont, Seeroong
Hietschold, Michael
Thanachayanont, Apinunt
Date Issued
October 29, 2013
Type
Conference Paper
Abstract
Dissolved Poly (methyl methacrylate) (PMMA) in Dimethylformamide solution was fabricated as thin films on different substrates, glass, poly (ethylene naphthalate) and Si wafer, using spin coating technique. The effect of different substrates on electrical performances of the PMMA films was investigated. For an acceptable organic thin-film transistor (OTFT) performance, uniform thickness with low defect density of the PMMA thin-films was required. A parallel plate capacitor structure was used to test electrical properties of the PMMA dielectric layers. Good dielectric properties were obtained on glass and PEN at film thicknesses of 95 nm. An optimal condition for the OTFT preparation was used to fabricate an OTFT with the PMMA dielectric layer on glass substrate. Measured results showed that the OTFT achieved a mobility of 0.16 cm2/V.s, a threshold voltage of -3.6 V, and on/off current ratio of 1×105. © (2013) Trans Tech Publications, Switzerland.
Citation
Advanced Materials Research, 802, 79-83, 2013