Silicon-based solar cell

Abstract

The invention discloses a silicon-based solar cell, comprising a transparent electrode, wherein the transparent electrode is a graphene film, and the thickness is not more than 20nm. The thin film isprepared by a suction filtration method, so as to ensure the uniformity of the thin film and the stability of the device. A water transfer method is used to control the thickness of the graphene filmat a nanometer level, and the transmittance of the film is improved. During the transfer process, micro-wrinkles are introduced to increase the contact area between the film and the photosensitive layer. After high temperature treatment, the graphene defects are few and the film strength is high, which can withstand the stress change in the process of repeated folding of the flexible electrode. The whole process is simple, green and easy to operate. Comparatively speaking, the graphene film has high electron mobility and relatively low light transmittance, and the solar energy absorbance of silicon is increased by continuous reflection, and the electron holes generated by the graphene film can be separated under the action of a built-in electric field, so as to improve the light conversionefficiency.

Description

technical field [0001] The invention relates to a solar cell, in particular to a silicon-based solar cell. Background technique [0002] With the increasingly serious environmental problems, the environmental problems brought about by the uncontrolled application of fossil energy have increasingly attracted the attention of adults. People are eager to find renewable, non-polluting new energy sources to replace heavily polluting fossil energy sources. And solar energy, as a source of earth statement, has been the object of attention. Among them, the graphene / silicon solar cell is one of the applications. It uses the different work functions of graphene (4.5eV) and silicon (4.31eV) to construct a heterojunction. The valence electrons in the photons absorb the photon energy of the incident light and undergo transitions, thereby forming electron-hole pairs. Under the action of the built-in electric field, the electron-hole pairs are separated and can be transported to the ext...

AI Technical Summary

Problems solved by technology

[0003] However, traditional graphene / silicon solar cells use single-layer graphene or few-layer mechanically exfoliated graphene as transparent conductive electrodes, which have the following problems. First, the thickness of graphene is low and the light absorption rate is too low; , single-layer graphene has many transfer defects and low electron mobility, which is not conducive to the transmission of photoelectrons; third, the area of ​​few-layer graphene is too small to be suitable for mass production

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