Quantum effects of ultrathin OTFT and fabrication processes by atomic hydrogen annealing

We had fabricated the pentacene organic thin-film transistor (OTFT) with very thin film thickness and investigated the electrical characteristics. When the film thickness decreased, the on current of OTFT increased. It is considered that the quantum level is formed in the triangle potential. The mobility of OTFT is improved by using quantum effect. In order to fabricate uniformly ultrathin OTFT without pinhole, the size of pentacene island must be smaller. We tried to fabricate pentacene island using atomic hydrogen annealing (AHA). It is found that pentacene and resist can be etched by AHA without damage. It is expected that this method is a promising technique for fabrication of ultrathin OTFT with small island.