As essential components of numerous flexible and wearable optoelectronic devices, the flexible transparent conducting electrodes (TCEs) with sufficient optical transmittance and electric conductivity become more and more important. In this work, we fabricated a large-area flexible TCE based on leaf vein-like hierarchical metal grids (HMG) comprising of mesoscale “trunk” and microscale “branches”. The self-formed branched grids made the conducting paths distributing uniformly while the laser-etching trunk grids enabled to transport the collected electrons across long-distance. The Ag HMG exhibited high optical transmittance (∼81%) with low sheet resistance (1.36 Ω sq^–1), which could be simply optimized through adjusting the grids’ widths, spaces, and the sizes of the TiO₂ colloidal crackle patterns. In addition, on the basis of such advanced HMG electrode, flexible electrochromic devices (ECDs) with remarkable cyclic performance were fabricated. The HMG with high transparency, conductivity, and flexibility provides a promising TCE for the next-generation flexible and wearable optoelectronic devices.

作为众多柔性和可穿戴光电设备的重要组成部分，具有足够透光率和导电性的柔性透明导电电极（TCEs）变得越来越重要。在这项工作中，我们基于由中尺度“主干”和微尺度“分支”组成的叶脉状分层金属网格 (HMG) 制造了大面积柔性 TCE。自形成的分支网格使导电路径均匀分布，而激光蚀刻的主干网格使收集的电子能够远距离传输。Ag HMG 表现出高透光率 (~81%) 和低薄层电阻 (1.36 Ω sq ^–1 )，这可以通过调整网格的宽度、间距和 TiO _{2的尺寸来简单地优化}胶体裂纹图案。此外，在这种先进的HMG电极的基础上，还制备了具有显着循环性能的柔性电致变色器件（ECD）。具有高透明度、导电性和柔韧性的 HMG 为下一代柔性和可穿戴光电设备提供了有前途的 TCE。