Hybrid structure using graphene-carbon nanotube and perovskite solar cell using the same

A preparation method of a graphene-carbon nanotube hybrid structure comprising a graphene-carbon nanotube formed by laminating a second graphene coated with a polymer layer on an upper surface of a first graphene coated with a carbon nanotube layer,

• wherein the first graphene has a first surface and an opposite second surface,
• the carbon nanotube layer has a first surface and an opposite second surface, and is coated on the second surface of the first graphene,
• the second graphene has a first surface and an opposite second surface, and is laminated on a surface of the carbon nanotube layer opposite the first graphene, and
• the polymer layer has a first surface and an opposite second surface, and is directly coated on the second graphene on a surface of the second graphene opposite the carbon nanotube layer,
• the preparation method comprising the steps:
• (A1) preparing the first graphene coated with the carbon nanotube layer, wherein the first graphene is coated with a carbon nanotube by dry-spinning the carbon nanotube in a film form on an upper surface of a first graphene synthesized on a first copper foil surface, wherein the step (A1) comprises:
• (A1a) dry-spinning the carbon nanotube in the form of a film on the upper surface of the first graphene synthesized on the first copper foil surface;
• (A1b) bonding the carbon nanotube to the upper surface of the first graphene by spraying alcohol onto the first graphene from which the carbon nanotube is spun;
• and
• (A1c) preparing the first coated graphene with the carbon nanotube coated on the upper surface by drying the alcohol;
• (A2) preparing the second graphene coated with the polymer layer, wherein the second graphene is coated with a polymer by spin-coating and curing the polymer on the upper surface of a second graphene synthesized on a second copper foil surface, wherein the step (A2) comprises:
• (A2a) spin-coating and curing the polymer directly on the upper surface of the second graphene synthesized on the second copper foil surface;
• (A2b) removing the copper by adding the second graphene to a copper etchant solution after the completion of the step (A2a);
• and
• (A2c) preparing the second coated graphene by putting the second graphene in deionized water to remove the copper etchant solution;
• and
• (A3) preparing the graphene-carbon nanotube hybrid structure by laminating the second graphene coated with the polymer layer on the upper surface of the first graphene coated with the carbon nanotube layer, wherein the step (A3) comprises:
• (A3a) laminating the second graphene coated with the polymer layer on the upper surface of the first graphene coated with the carbon nanotube layer;
• and
• (A3b) after the step (A3a) is completed, preparing the graphene-carbon nanotube hybrid structure by adding the first copper foil to a copper etchant solution to remove the copper foil used for the synthesis of the first graphene,
• wherein the first graphene synthesized on the first copper foil surface is prepared by a method comprising:
• a step of putting a copper foil of high purity in a furnace at 1,000° C. to 1,100° C. in a hydrogen atmosphere;
• a step of reacting the copper foil with methane in the furnace;
• and
• a step of cooling the furnace to room temperature to prepare the graphene synthesized on the surface of the copper foil,
• wherein the polymer in the polymer layer is at least one selected from the group consisting of poly(methyl methacrylate) (PMMA), poly(bisphenol A carbonate) (PC), polyvinylidenefluoride-hexafluoropropylene (PVDF-HFP), polyethylene oxide (PEO), polyacrylonitrile (PAN), and polyvinylalcohol (PVA).