| 초록 |
Low-dimensional materials such as graphene and silver nanowire (AgNW) have been extensively emerged as an attractive candidates for future opto-electric applications because of their high optical transparency, outstanding mechanical flexibility and excellent electric conductivity. For the high-density and low cost processing, however, high-resolution patterning technique of low dimensional materials is essentially required. In this study, we introduce a simple and high-resolution patterning technique of AgNWs based on the filtration of AgNWs solution on the patterned polyimide shadow mask. In this method, the pattern size of AgNWs network can be easily controlled as function of the pattern size of polyimide mask. In order to confirm the possibility of the proposed concept, we fabricated the highly flexible and transparent ZnO-based UV photodetector arrays based on the patterned AgNWs electrodes. Here, the patterned AgNW electrodes can be embedded in ZnO film to enhance the adhesion between electrode and film and the photocurrent by light scattering effect. The mechanical and optical performances of ZnO-based UV photodetector embedded with AgNWs electrode were greatly enhanced compared to the stacked AgNWs electrode type. In addition, the flexible UV photodetector can be operated with stable and reproducible current under extremely bent state (bending radius of ~770 um). This patterning strategy can be further expanded to other low dimensional materials and applied to various device applications such as photodetector and thin-film transistor. |
