The novel encapsulation method for organic thin-film transistors

In this study, we report a novel encapsulation method for longevity of an organic thin-film transistor (OTFT) using pentacene by means of an adhesive multiplayer included Al film. For encapsulation of OTFTs, the Al film adhered onto the OTFT in a dry nitrogen atmosphere using a proper adhesive. A lifetime, which was defined as the time necessary to reduce mobility to 2% of initial mobility value, was observed from the typical ID–VD characteristics of the field-effect transistor (FET). The initial field effect mobility, μ, was measured to be 2.0 × 10−1 cm2/V s. The characterization was maintained for long times in air. No substantial degeneration occurred. The performance and the stability are probably due to the encapsulation effect.