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Perovskite battery having graphene barrier layer and preparation method

A perovskite battery, graphene technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of irreversible decomposition of water and oxygen, harmful doping of perovskite materials, affecting the flexibility of flexible devices, etc. Oxygen stability and thermal stability, the effect of improving water and oxygen stability, and improving thermal stability

Inactive Publication Date: 2017-02-22
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Perovskite battery having graphene barrier layer and preparation method
  • Perovskite battery having graphene barrier layer and preparation method
  • Perovskite battery having graphene barrier layer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: substrate pretreatment;

[0030] (1) Etching the FTO glass with zinc powder and dilute hydrochloric acid into a strip structure of 4mm*25mm; the dilute hydrochloric acid is prepared by mixing 1 volume mass fraction of 38% concentrated hydrochloric acid and 4 volumes of water.

[0031] (2) The etched FTO glass was ultrasonically cleaned in acetone, isopropanol, and ethanol for 5 minutes each, and dried with nitrogen.

[0032] Step 2: preparing a perovskite thin film battery substrate;

[0033] (1) Deposit a layer of TiO on the etched FTO surface by hydrothermal insulation deposition method 2 as electron transport material;

[0034] (2) The perovskite layer is spin-coated on the electron transport layer by solution spin coating, and the solution used is CH 3 NH 3 I and PbI 2 The mixed solution, the solution concentration is 1.2mol / L;

[0035] (3) The hole transport layer Spiro-MeOTAD is spin-coated on the perovskite layer by the solution spin coating method,...

Embodiment 2

[0046] In this example, the thickness of the gold electrode is 90nm, the thickness of PDMS is 0.5mm, the material of the electron transport layer is ZnO, and the material of the hole transport layer is P3HT; wherein, the perovskite battery substrate and the graphene film are heated at 70°C at the same time Heating on the stage for 10 minutes, and then pasting the heated graphene film on the heated perovskite battery substrate, and then fumigated with solvent. Other steps are the same as Example 1. In this example, the efficiency of the perovskite cell with the graphene barrier was 14.6%. The thermal stability of the battery can reach 85% after being heated at 80°C for 6 hours continuously, and the water-oxygen stability can reach 90% after being placed in the air for 48 hours.

Embodiment 3

[0048] In this example, the thickness of the gold electrode is 100nm, the thickness of PDMS is 0.5mm, and the material of the electron transport layer is Nb 2 o 5 , the material of the hole transport layer is P3HT; among them, the multi-layer copper-based graphene film is etched in ferric chloride solution for 5-6 hours, then dried and heated at 80°C with the normal temperature perovskite battery substrate For lamination, place it on a hot stage at 85°C again and anneal it with toluene solvent for 15 minutes. Other steps are the same as Example 1. In this example, the efficiency of the perovskite cell with the graphene barrier was 15.12%. The thermal stability of the battery can reach 90% after being heated at 80°C for 6 hours continuously, and the water-oxygen stability can reach 95% after being placed in the air for 48 hours.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/44H01L51/48
CPCH10K30/10H10K30/88Y02E10/549
Inventor 刘治科胡西红李娟高斐姜红
Owner SHAANXI NORMAL UNIV
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