水分子对有机场效应晶体管阈值电压稳定性的影响

Effect of Water Molecules on Threshold Voltage Stability of Organic Field Effect Transistors

以重掺杂Si片为衬底,SiO_2为栅绝缘层,并五苯为有源层,制备了有机场效应晶体管(OFETs),研究了空气中水汽对场效应性能的影响。实验表明:当器件较长时间放置在空气中时,吸附在并五苯和SiO_2接触面之间的水分子导致阈值电压漂移,器件的稳定性降低;经过热处理的器件的阈值电压漂移现象消失。提出了解释阈值电压漂移现象的模型,该模型可解释水分子在这个过程中所起的作用。

Pentacene-based organic field-effect transistors （OFETs） is fabricated with n-doped silicon substrate as the gate electrode and as the dielectric. The influence of ambient atmosphere on the threshold voltage of organic field-effect transistors is studied. The adsorption of the pentacene-interface largely affects the electri- cal characteristics of the OFETs, where a shift is clearly present. It can be eliminated through the thermal an- nealing processes, a new model to interpret the shift of threshold voltage is presented, this model also explains the role of water in the device.