基于AgNW:HPMC嵌入结构的低粗糙度银纳米线透明电极性能研究

Research on the Performance of Low Roughness Silver Nanowire Transparent Electrode Based on AgNW:HPMC Embedded Structure

将银纳米线与不同浓度的羟丙基甲基纤维素以一步混合的方法制备导电银浆,旋涂并热压制备具有嵌入式结构的复合透明电极。分别改变银纳米线和羟丙基甲基纤维素的混合比例,研究其比例对电极光电性能、粗糙度和稳定性的影响。结果表明,一步法得到的导电银浆可以有效制备嵌入式结构透明电极,显著改善银纳米线电极的平整性和稳定性。电极中羟丙基甲基纤维素的增加对电极的光电性能影响较小,但是极大降低了电极的粗糙度。最优化电极的平均表面均方根粗糙度仅为4.6 nm。羟丙基甲基纤维素对银纳米线的保护使透明电极在强氧化环境和胶带测试下均可保持良好的稳定性。

A conductive silver paste is prepared by mixing Ag Nanowires(AgNW)with different concentrations of Hydroxypropyl Methyl Cellulose(HPMC)in one-step process,and then a composite transparent electrode with Ag nanowires embedded in HPMC(AgNW:HPMC)is prepared by spin coating and subsequent hot pressing.The mass ratio of Ag nanowires and HPMC is changed by 1∶1,1∶2and 1∶3,and its effects on the photoelectric properties,roughness and stability of the transparent electrode were investigated.The results show that the conductive silver paste obtained by the one-step process can effectively prepare composite transparent electrodes with excellent performance.Increasing the ratio of HPMC in the conductive silver paste slightly decreases the conductivity and transparent of the AgNW:HPMC composite electrode due to the insulating and compactness properties of HPMC.While the flatness of the AgNW:HPMC composite electrodes is significantly improved with HPMC filling the empty space between the silver nanowires.The surface roughness decreases with increasing the proportion of HPMC,and the lowest Root-Mean-Square(RMS)roughness is only 4.6 nm when the mass ratio of Ag nanowires and HPMC is 1∶3.In addition,the composite electrodes with Ag nanowires embedded in HPMC exhibit remarkable stability under extreme conditions.When the nanowire electrode is exposed in atmosphere,HPMC can protect Ag nanowire from the corrosion of water and oxygen.The sheet resistance of the AgNW:HPMC electrode was doubled while the neat Ag nanowire electrode had lost its electrical conductivity after the electrodes were exposed in atmosphere for 21 days.Besides,HPMC can help the composite electrode maintain good photoelectric performance under the strong oxidative environment irradiated by ultraviolet light source.After 15 minutes of ultraviolet treatment,the sheet resistance only increased by 25%.Moreover,the adhesion properties of the AgNW:HPMC composite electrode is improved because HPMC strengthens the contact between the silver nanowires and the substrate,and the good photoelectric performance and surface morphology are still maintained under the destructive test with tape.