▎ 摘　　要

NOVELTY - Flexible transparent electrode has a MXene layer arranged between a first graphene layer and a second graphene layer. The first graphene layer and the second graphene layer are formed as a single-layer graphene. The MXene layer is obtained by spin coating MXene solution and a heating plate. The MXene layer is formed as a single-layer graphene. USE - Flexible transparent electrode used for flexible photoelectric device and battery. ADVANTAGE - The flexible transparent electrode has excellent electrical and mechanical properties, stable performance, and low cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for following: (1) a method for preparing a flexible transparent electrode suitable for flexible optoelectronic devices, which involves preparing a single layer of graphene as the first graphene layer;spin-coating the MXene solution on the first graphene layer and heating it on a hot plate to obtain the MXene layer;preparing a single layer of graphene on the MXene layer as the second graphene layer and then laminating to obtain a flexible transparent electrode; (2) a flexible perovskite solar cell, which comprises a flexible substrate (101), a flexible transparent electrode (102), a first charge transport layer (103), a light active layer (104), a second charge transport layer (105) and a metal back electrode (106); and (3) a method for preparing flexible perovskite solar cell, which involves taking the PET substrate, using de-ionized water, acetone, isopropanol ultrasonic treatment on the surface of thesubstrate, drying the nitrogen gas flow to obtain theflexible substrate, using CVD method toprepare single-layer graphene on the flexible substrate, forming a first graphene layer, then spincoating MXene solution on the first graphene layer, and heating the hot plate, forming MXene layer, using CVD method to prepare single-layergraphene on the MXene layer, forming asecond graphene layer, first graphene layer, MXene layer (1022) and the secondgraphene layer are laminated to obtain theflexible transparent electrode, spincoating NiOx ink on the flexible transparent electrode, heating the hot plate, as the first charge transport layer, preparing a light activelayer on the first charge transport layer, where light active layer is made of organic-inorganic hybrid metal halide perovskite material, and preparing C60/BCP as the second charge transport. DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of flexible perovskite solar cell. Flexible substrate (101) Flexible transparent electrode (102) First charge transport layer (103) Light active layer (104) Second charge transport layer (105) Metal back electrode (106)