A flexible organic active matrix circuit fabricated using novel organic thin film transistors and organic light-emitting diodes

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Semiconductor Science and Technology, ISSN: 0268-1242, Vol: 25, Issue: 11

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Gutiérrez-Heredia, Gerardo; González, Luis A.; Alshareef, Husam N.; Gnade, Bruce E.; Quevedo-López, Manuel Angel Quevedo
IOP Publishing
Engineering; Materials Science; Physics and Astronomy
article description
We present an active matrix circuit fabricated on plastic (polyethylene naphthalene, PEN) and glass substrates using organic thin film transistors and organic capacitors to control organic light-emitting diodes (OLEDs). The basic circuit is fabricated using two pentacene-based transistors and a capacitor using a novel aluminum oxide/parylene stack (AlO/ parylene) as the dielectric for both the transistor and the capacitor. We report that our circuit can deliver up to 15 μA to each OLED pixel. To achieve 200 cd m of brightness a 10 μA current is needed; therefore, our approach can initially deliver 1.5× the required current to drive a single pixel. In contrast to parylene-only devices, the AlO /parylene stack does not fail after stressing at a field of 1.7 MV cm for >10 000 s, whereas 'parylene only' devices show breakdown at approximately 1000 s. Details of the integration scheme are presented. © 2010 IOP Publishing Ltd.