Perovskite battery having graphene barrier layer and preparation method

Abstract

The invention discloses a perovskite battery having a graphene barrier layer and a preparation method. The preparation method comprises the steps of: (1) sequentially preparing an electron transport layer, a perovskite absorption layer and a hole transport layer on the washed substrate to obtain a perovskite battery substrate; (2), evaporating the gold electrode on the graphene prepared by the CVD method, bonding the PDMS to the gold electrode to obtain a barrier base, and then soaking the barrier base to remove the graphene growth substrate in the etching solution to obtain a graphene film covered with PDMS and the gold electrode; (3), bonding the graphene side of the graphene film to the hole transport layer of the perovskite battery substrate, and then removing the PDMS layer on the other side to obtain the perovskite battery having the graphene barrier layer. The perovskite battery can effectively block the harmful diffusion of the metal electrode to the perovskite layer at high temperature and can effectively prevent the oxygen in the air from entering the perovskite layer to prevent the decomposition of the perovskite layer.

Description

technical field [0001] The invention relates to a thin-film solar cell, in particular to a perovskite cell with a graphene barrier layer and a preparation method. Background technique [0002] Organic-inorganic hybrid material CH 3 NH 3 wxya 3 It is a perovskite structure, which is a bipolar semiconductor material with the characteristics of low cost, easy film formation, narrow band gap, good light absorption performance, and high carrier mobility. In recent years, due to the excellent photoelectric properties of perovskite materials , making it a research focus in the field of photovoltaic materials. Thin-film solar cells made of such materials are called perovskite solar cells. The main technical indicators that determine the performance of perovskite batteries are the photoelectric conversion efficiency of the battery and the stability of the battery. The efficiency of solar cells based on perovskite materials has jumped from 3.8 percent in 2009 to 22.1 percent curr...

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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, epoxy resin is usually used 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 cost of device preparation. difficulty

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