Organic-only dielectric films are needed for several electronic applications, particularly in organic field-effect transistors (OFETs). Here, cyclic olefin copolymer (COC) films with the thickness on the order of 100 nm are reported as satisfactory dielectric layers for high-performance and reliable OFETs. The COC dielectric film has a high glass-transition temperature and low free volume, which contribute to its superior insulating properties and high dielectric strength. Moreover, the smooth surface morphology and low surface energy of the COC film are responsible for the formation of highly crystalline structures of the overlying pentacene molecules. Finally, the OFETs with the COC dielectric layers are found to exhibit charge-carrier mobilities up to 1.075 ± 0.05 cm²/V and on/off ratios exceeding 10⁶ while displaying low gate leakage current and negligible hysteresis.

纯有机介质膜对于几种电子应用来说是必需的，尤其是在有机场效应晶体管（OFET）中。在此，据报道，厚度为100 nm的环状烯烃共聚物（COC）膜是用于高性能和可靠的OFET的令人满意的介电层。COC介电膜具有较高的玻璃化转变温度和较低的自由体积，这有助于其优异的绝缘性能和较高的介电强度。而且，COC膜的光滑表面形态和低表面能是形成其上并五苯分子的高度结晶结构的原因。最后，发现具有COC介电层的OFET具有高达1.075±0.05 cm ² / V的载流子迁移率，开/关比超过10^6，同时显示低的栅极漏电流和可忽略的磁滞。