an energy supply for flexible electronics, perovskite solar cells (FPSCs) should present desirable flexibility and stability while maintaining high efficiency. [8,9] The crucial part of the FPSCs that currently limits their flexibility is the transparent conductive electrodes (TCEs). Indium tin oxide (ITO) electrodes, which are acknowledged to be widely used in PSCs, [10][11][12] have excellent optoelectronic properties but incompatible for plastic substrates when annealing at high temperatures (250 °C) as well as their intrinsic brittleness. Therefore, it is challenging to develop novel TCEs for highly efficient and mechanically stable FPSCs.Alternatively, TCEs based on conductive organic polymers, [13][14][15] carbon materials, [16][17][18] and metal structures [19][20][21][22][23][24] have been successfully demonstrated in flexible optoelectronic devices. Among those, metal-based TCEs, especially metal nanowires (NWs) or meshes, are the ideal candidates due to their good conductivity, optical transparency, and mechanical flexibility. However, the major issue to the metal-based TCEs application in FPSCs is the degradation induced by the interdiffusion of metals and halide ions. [25,26] Attempts have been made to add a protective layer such as metal oxides, [24,27] conductive polymers, [22,23] and carbon materials [28] between the metal-based TCEs and the perovskite absorber layer. Lee et al. deposited pinhole-free amorphous aluminum-doped zinc oxide (a-AZO) protective layers on the silver nanowires (AgNWs) network. [29] Compared with its crystalline counterpart (c-AZO), amorphous aluminum-doped zinc oxide (a-AZO) greatly improved the chemical stability of AgNWs. The FPSC prepared based on this electrode achieved a PCE of 11.23%, which was still lower than that of the poly(ethylene naphthalate) (PEN)/ITO-based FPSC (13.56%). This is mainly limited by the rough surface morphology of metal NWs and the junction resistance due to its random distribution. In comparison, metal mesh can be artificially designed in terms of spacing, line width, and mesh thickness to achieve uniform and controllable morphology, with tunable optoelectronic properties and eliminated junction resistance. [30] Jeong et al. introduced a hybrid electrode by using a Cu mesh-embedded polyimide (CEP) with a graphene sheet as the protective layer, named GCEP. [28] The FPSCs on the GCEP achieved a PCE of 16.4%. Meanwhile, Metal-mesh transparent conductive electrodes (TCEs)-based flexible perovskite solar cells (FPSCs) have been intensively explored to improve the efficiency and stability of the devices, whereas undesired metal-induced decomposition of perovskite during film formation process could undermine the performance and stability of device. In this work, the authors construct a novel flexible hybrid electrode combining silver (Ag) mesh-embedded poly(ethylene terephthalate) film (PET/Ag-mesh) with a thin indium tin oxide (ITO) layer, named PET/Ag-mesh/ITO, which exhibits outstanding photoelectric properties, chemical stability, and mechanical...
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