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Water-Related Instabilities in Pentacene Thin-Film Transistors
L. Mariucci,S. Cipolloni,D. Simeone,M. Cuscuna,L. Maiolo,A. Minotti,A. Pecora,A. Valletta,G. Fortunato 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
We have analyzed the hysteresis of the transfer characteristics of pentacene thin-film transistors (TFTs) measured under different environmental conditions (vacuum, oxygen, dry nitrogen, air and nitrogen with different relative humidities). The results showed that, whereas the characteristics in dry atmospheres are quite stable, the hysteresis increases with the percentage of moisture, indicating that adsorbed water is the main cause of the environmental instability in pentacene TFTs. In addition, transient current experiments have been carried out in air. Through these measurements, we have been able to evaluate a characteristic time of drain current reduction of several seconds. These results indicate that the environmental instability is not simply related to charge trapping in localized gap states and slower phenomena should also be considered.