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Application Notes
Organic thin film transistors (OTFTs) made of organic or polymeric materials have been developed for applications such as electronic paper and radio frequency identification (RFID) tags due to their ability to be fabricated over a large area such as a flexible plastic printed circuit board.
Unfortunately, the carrier mobility of OTFTs is inferior to the performance levels of existing inorganic materials such as silicon based FETs. This is due to the OTFT’s conduction mechanism and the large number of traps at the boundary between the semiconductor and the gate dielectric. To increase the mobility of OTFTs to practical levels, transient response measurements and pulsed bias measurements are essential to understand the carrier transportation mechanisms in detail. In addition, it is also necessary to characterize the OTFT’s DC current versus voltage (IV) and capacitance versus voltage (CV) characteristics. A transient response measurement in which current is measured at very short intervals while applying a step voltage is useful to investigate carrier conduction mechanisms and mobility degradation due to trapped charge at the boundary defect.
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