Stability of High performance p-type SnO TFTs

High performance p-type SnO TFTs were fabricated and characterized in this work. Owing to thermal oxygen annealing process, the originally tin-rich oxide film was transformed into a polycrystalline SnO, resulting in decent field-effect mobility and high on/off current ratio. Electrical stability was evaluated by examining the threshold voltage shift under negative bias stresses at different stress times. A scenario considering the passivation/de-passivation of acceptor defects in the channel and the hole trapping of the gate oxide is proposed to explain the observed instability of the SnO TFTs.