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Abstract
We investigated the influence of pentacene film thickness on the environmental stability of thin-film transistors (TFTs). In order to evaluate the environmental stability, the transfer and output characteristics in pentacene TFTs were measured in air and vacuum environments. The pentacene-thickness-dependent variation of transfer characteristics was shown to originate from the fixed charge at the pentacene/polymeric insulator interface induced by air molecules. In addition, an analysis of parasitic resistance suggests that air molecules degraded the contact property and increased channel conductivity. Particularly, a thick pentacene film was found to passivate the TFT channel region interrupting the penetration of air molecules.
Acknowledgements
This work was supported by Hallym University Research Fund (HRF-G-2015-1) and Basic Science Research Programs through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A1A4A01009807 and 2014R1A1A2057057). This research was also supported by Global Ph.D. Fellowship Program through the NRF funded by the Ministry of Education (2014H1A2A1021666).