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Bias stress in organic thin-film transistors and logic gates

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4 Author(s)
Zilker, S.J. ; Philips Research Laboratories, Professor Holstlaan 4, NL-5656 AA Eindhoven, The Netherlands ; Detcheverry, C. ; Cantatore, E. ; de Leeuw, D.M.

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Threshold voltage instabilities of all-organic thin-film transistors are investigated as a function of stress time and stress bias. The dominant effect is a positive threshold shift for negative gate bias stress which is explained by mobile ions drifting in the insulator when a gate field is applied. Trapping of charge carriers at the semiconductor–insulator interface plays only a minor role. Furthermore, we investigate the stress behavior of a basic logic element, an inverter. In comparison to a single transistor, we observe improved stability which arises from partial compensation of the parametric shifts during operation. © 2001 American Institute of Physics.

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Applied Physics Letters  (Volume:79 ,  Issue: 8 )