A kind of flexible thin film solar cell

Abstract

The invention discloses a flexible thin-film solar cell. The flexible thin-film solar cell sequentially comprises an upper substrate, a graphene positive electrode layer, a photovoltaic material layer, a graphene negative electrode layer and a lower substrate from top to bottom, wherein the photovoltaic material layer is prepared from CdTe nanoparticles, the upper substrate and / or the lower substrate are PI thin-film layers, the photovoltaic material layer has the thickness of 200-400nm, the graphene positive electrode layer is made from p-type doped graphene and has the thickness of 0.3-3nm, and the graphene negative electrode layer is made from n-type doped graphene and has the thickness of 0.3-3nm. The flexible thin-film solar cell disclosed by the invention has high flexibility and is excellent in durability, corrosion resistance and radiation resistance, the influence caused by external environment is extremely low, and the problems of the traditional ITO (Indium Tin Oxide) electrodes are comprehensively solved; according to the flexible thin-film solar cell, the photovoltaic material layer is prepared from the CdTe nanoparticles, so that the absorption rate of visible light can be greatly increased.

Description

technical field [0001] The invention belongs to the field of semiconductor devices, and relates to an electrical element used for photoelectric conversion, in particular Background technique [0002] Flexible thin-film solar cell is an emerging technology product in the world's solar energy industry. It is a solar cell made of a resin-encapsulated light-absorbing layer as a photoelectric element laid on a base plate made of flexible materials. It is easy to carry because of its bendable and foldable properties. The obvious advantages, so it has a wide range of uses. However, in the preparation process of traditional flexible thin-film solar cells, the requirements for equipment are high, and the process is limited by the poor temperature resistance of the substrate (especially polymer substrates, such as PI, PET, PEN, etc.); making the preparation cost of flexible thin-film solar cells High, battery efficiency is low, which greatly limits the development of flexible thin fi...

AI Technical Summary

Problems solved by technology

However, in the preparation process of traditional flexible thin-film solar cells, the requirements for equipment are high, and the process is limited by the poor temperature resistance of the substrate (especially polymer substrates, such as PI, PET, PEN, etc.); making the preparation cost of flexible thin-film solar cells High, battery efficiency is low, which greatly limits the development of flexible thin film battery industry, especially transparent substrate flexible thin film battery industry

[0003] Since In 2 o 3 : SnO 2 (ITO) has the characteristics of high visible light transmittance and low resistance. Currently, ITO is mostly used as an electrode in optoelectronic devices, but it has the following disadvantages: 1. Indium in ITO is highly toxic and harmful to human body during preparation and application. ; 2. In in ITO 2 o 3 The price is expensive and the cost is high; 3. The ITO film is susceptible to the reduction effect of hydrogen plasma, and the efficacy is reduced. This phenomenon will also occur at low temperature and low plasma density; 4. The ITO film on the flexible substrate will be damaged due to Conductivity drop due to bending of flexible substrate

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