Flexible transparent electrodes are in significant demand in applications including solar cells, light-emitting diodes, and touch panels. The combination of high optical transparency and high electrical conductivity, however, sets a stringent requirement on electrodes based on metallic materials. To obtain practical sheet resistances, the visible transmittance of the electrodes in previous studies is typically lower than the transparent substrates the electrode structures are built on, namely, the transmittance relative to the substrate is <100%. Here, we demonstrate a flexible dielectric-metal-dielectric-based electrode with ~88.4% absolute transmittance, even higher than the ~88.1% transmittance of the polymer substrate, which results in a relative transmittance of ~100.3%. This non-trivial performance is achieved by leveraging an optimized dielectric-metal-dielectric structure guided by analytical and quantitative principles described in this work, and is attributed to an ultra-thin and ultra-smooth copper-doped silver film with low optical loss and low sheet resistance.

在包括太阳能电池，发光二极管和触摸面板的应用中，对柔性透明电极有大量需求。然而，高光学透明度和高导电性的结合对基于金属材料的电极提出了严格的要求。为了获得实用的薄层电阻，先前研究中电极的可见透射率通常低于构建有电极结构的透明基板，即相对于基板的透射率＜100％。在这里，我们展示了一种具有约88.4％绝对透光率的挠性基于金属电介质的柔性电极，甚至高于聚合物基板的〜88.1％透光率，其相对透光率约为100.3％。