Perovskite cell with graphene barrier layer and preparation method of perovskite cell

Abstract

The invention discloses a perovskite battery with a graphene barrier layer, and the perovskite cell comprises a perovskite cell substrate. A composite thin film layer is arranged on the perovskite cell substrate, and a gold electrode matched for use is arranged on the composite thin film layer. The perovskite cell substrate achieves the conduction with a gold electrode through the composite thin film layer. The perovskite cell substrate comprises an electron transport layer, a perovskite absorption layer and a hole transport layer, wherein the composite thin film layer sequentially comprises afirst P-type graphene thin film, an N-type perovskite thin film and a second P-type graphene thin film from bottom to top. The perovskite solar cell is good in water-oxygen stability, high in thermalstability, simple in method operation and high in plasticity; the stability of the perovskite solar cell is improved, the service life of the perovskite solar cell is prolonged, the photoelectric conversion efficiency is improved, and the actual use requirement is met.

Description

technical field [0001] The invention relates to a perovskite battery with a graphene barrier layer and a preparation method thereof, belonging to the technical field of thin film solar cells. Background technique [0002] Graphene is a honeycomb two-dimensional material formed by hexagonal close packing of carbon atoms, and its thickness is less than 1 nanometer. The pi-orbital electron cloud of the carbon atoms creates a dense, localized electric field in the graphene's hexagonal gaps that does not allow anything to pass through the graphene's pores. In addition, according to the atomic structure of graphene, the hexagonal gap formed by carbon atoms only allows atoms with a radius of 0.032nm to pass through, which is smaller than the atom with the smallest radius (hydrogen: 0.079nm). According to the above principles, Graphene can block the passage of any atoms and molecules, so it has a unique impermeability. In addition, due to the potential application prospects of nob...

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Problems solved by technology

[0003] In the prior art, on the one hand, perovskite materials are very sensitive to moisture and oxygen, and are prone to irreversible decomposition when encountering water and oxygen; on the other hand, perovskite devices also have thermal stability problems, and the main reason for thermal attenuation is the top layer Electrodes (including gold electrodes) are capable of detrimentally doping perovskite materials through the charge transport layer at relatively low temperatures (75°C), resulting in rapid decay of cell efficiency in a very short time

In order to improve the water and oxygen stability of perovskite devices, the traditional technology is to use epoxy resin for packaging. This hard packaging material will not only affect the stability of the perovskite layer, but also seriously affect the flexibility of flexible devices.

In order to improve the thermal stability and water-oxygen stability of perovskite devices, a layer of inert metal (such as: Cr, Ni, etc.) or organic insulating material (such as: PMMA, PC, etc.), due to the diffusion of metals, the improvement of thermal stability of inert metals is very limited, and the thickness of organic insulating materials has a great influence on the photoelectric performance of the device, which needs to be strictly controlled, which greatly increases the difficulty of device preparation

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