Fullerene thin-film transistors fabricated on polymeric gate dielectric |
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Authors: | J Puigdollers C Voz A Orpella R Alcubilla |
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Affiliation: | a Micro and Nano Technology Group (MNT), Dept. Enginyeria Electrònica, Universitat Politècnica Catalunya, C/ Jordi Girona 1-3, Mòdul C4, 08034-Barcelona, Spain b ICFO — Mediterranean Technology Park, Avda del Canal Olímpic s/n, 08860-Castelldefels, Spain |
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Abstract: | Thin-film transistors with fullerene as n-type organic semiconductor have been fabricated. A polymeric gate dielectric, polymethyl methacrylate, has been used as an alternative to usual inorganic dielectrics. No significant differences in the microstructure of fullerene thin-films grown on polymethyl methacrylate were observed. Devices with either gold or aluminium top electrodes have been fabricated. Although the lower work-function of aluminium compared to gold should favour electron injection, similar field-effect mobilities in the range of 10− 2 cm2 V− 1 s− 1 were achieved in both cases. Actually, the output characteristics indicate that organic thin-film transistors behave more linearly with gold than with aluminium electrodes. These results confirm that not only energy barriers determine carrier injection at metal/organic interfaces, but also chemical interactions. |
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Keywords: | Organic semiconductors Electronic devices |
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