Organic–inorganic hybrid perovskite materials have received much attention in light-emitting applications during the past several years. The commonly used indium tin oxide (ITO) electrodes in perovskite light-emitting devices (PeLEDs) have unavoidable drawbacks of increasing cost and incompatibility with flexible devices, which limit the development of PeLEDs. Here, high-performance and ITO-free flexible PeLEDs utilizing ultrathin Au electrodes have been achieved and exhibited high brightness ($>10,000{\mathrm{cdm}}^{-2}$). By introducing a ${\mathrm{MoO}}_3/\mathrm{SU}\text{-}8$ modification layer, the ultrathin Au film with a thickness of 7 nm exhibits excellent surface morphology with a root-mean-square roughness value of 0.307 nm. Meanwhile, the ultrathin Au film demonstrates an outstanding optical property with transparency of 83% at the wavelength of 550 nm. Simultaneously, favorable conductivity with a sheet resistance of $13\mathrm{\Omega }{\mathrm{sq}}^{-1}$ has been achieved. High mechanical robustness and flexibility have been obtained for the flexible PeLEDs by surviving 1000 bending cycles. The flexible PeLEDs reported here exhibit tremendous potential for commercial applications.

中文翻译：

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基于超薄金电极的高柔性有机-无机杂化钙钛矿发光器件

在过去的几年中，有机-无机杂化钙钛矿材料在发光应用中备受关注。钙钛矿发光器件（PeLED）中常用的铟锡氧化物（ITO）电极具有不可避免的缺点，即成本增加以及与柔性器件不兼容，这限制了PeLED的发展。在这里，已经实现了利用超薄Au电极的高性能，无ITO柔性PeLED，并具有高亮度（$>10，000{\mathrm{光盘}}^{-\mathrm{2个}}$）。通过引入一个$O_3/苏\text{--}8$改性层中，厚度为7 nm的超薄Au膜具有出色的表面形态，均方根粗糙度值为0.307 nm。同时，超薄金膜显示出优异的光学性能，在550 nm波长下的透明度为83％。同时，导电性好，薄层电阻为$13\mathrm{\Omega }{\mathrm{平方}}^{-\mathrm{1个}}$已经实现。通过承受1000次弯曲循环，柔性PeLED获得了很高的机械强度和柔韧性。此处报道的柔性PeLED具有巨大的商业应用潜力。