基于电化学重氮还原的碳膜电极表面修饰及功函调控

基于高温裂解光刻胶制备的碳薄膜(PPF)是一种新型的性能优异的碳基电极. 为了拓展其在功能器件中的应用, 利用电化学重氮还原法在PPF电极表面生长了三氟甲基苯胺重氮盐(CF₃-PD)和对氨基苯甲醚重氮盐(OCH₃-PD)两种组分的混合膜. 通过调节两组分溶液在混合膜中的摩尔浓度比例, 实现了对PPF电极功函的可控调节. 紫外光电子能谱(UPS)和开尔文探针显微镜(KPFM)对修饰前后PPF电极功函(?)的表征表明, 随着混合溶液中CF₃-PD组分的摩尔分数从0增至100%, PPF电极的?(4.75 eV)从4.5 eV梯度增至5.14 eV. 研究结果实现了可在一定范围内“定制”PPF电极功函, 为碳膜电极在分子光电器件中的应用奠定了基础.

Surface Modification and Work Function Control of Carbon Film Electrode Based on Electrochemical Diazonium Reduction

Pyrolyzed photoresist films（PPF） is a new type of carbon-based electrode material of excellent and modulable performance. To facilitate its applications in organic electronic devices， we modulated the work function（?） of the PPF via the electrochemical diazonium reduction method to grow mixed layer containing two components， trifluoromethyl（CF₃-PD） and p-anisidine（OCH₃-PD） on the surface of the PPF electrode. By adjusting the relative concentration of the two-components in the solution， gradient work functions of the PPF electrode were obtained. Work functions of the modified PPF electrodes were characterized by means of UV photoelectron spectroscopy（UPS） and Kelvin probe microscope（KPFM）. The results show that as the concentration of the CF₃-PD component in the mixed solution increases from 0 to 100%， the work function of the PPF electrode（?=4.75 eV） increases gradually from 4.5 eV to 5.14 eV. Our work has realized the tunable work functions of PPF electrodes and provided possibility for the further applications of PPF electrodes for molecular optoelectronic devices.