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HIGHLY STABLE AMORPHOUS SILICON THIN FILM TRANSISTORS AND INTEGRATION



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HIGHLY STABLE AMORPHOUS SILICON THIN FILM TRANSISTORS AND INTEGRATION APPROACHES FOR RELIABLE ORGANIC LIGHT EMITTING DIODE DISPLAYS ON CLEAR PLASTIC Bahman Hekmatshoar A DISSERTATION PRESENTED TO THE FACULTY OF PRINCETON UNIVERSITY IN CANDIDACY FOR THE DEGREE OF DOCTOR OF PHILOSOPHY RECOMMENDED FOR ACCEPTANCE BY THE DEPARTMENT OF ELECTRICAL ENGINEERING ADVISOR JAMES C STURM SEPTEMBER 2010 Copyright by Bahman Hekmatshoar 2010 Al Rights Reserved Abstract iii Hydrogenated amorphous silicon a Si H thin film transistors TFTs are currently in widespread production for integration with liquid crystals as driver devices Liquid crystal displays are driven in AC with very low duty cycles and therefore fairly insensitive to the TFT threshold voltage rise which is well known in a Si H devices Organic light emitting diodes OLEDs are a future technology choice for flexible displays with several advantages over liquid crystals In contrast to liquid crystal displays however OLEDs are driven in DC and thus far more demanding in terms of the TFT stability requirements Therefore the conventional thinking has been that a Si H TFTs are too unstable for driving OLEDs and the more expensive poly Si or alternative TFT technologies are required This thesis defies the conventional thinking by demonstrating that the knowledge of the degradation mechanisms in a Si H TFTs may be used to enhance the drive current half life of a Si H TFTs from lower than a month to over 1000 years by modifying the growth conditions of the channel and the gate dielectric Such high lifetimes suggest that the improved a Si H TFTs may qualify for driving OLEDs in commercial products Taking advantage of industry standard growth techniques the improved a Si H TFTs offer a low barrier for industry insertion in stark contrast with alternative technologies which require new infrastructure development Further support for the practical advantages of a Si H TFTs for driving OLEDs is provided by a universal lifetime



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