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Applications of graphene in solar cells
- Jul 04, 2018 -

The widely used light-transmitting electrode material is a metal oxide such as indium tin oxide, but it has strong absorption to the infrared spectrum, poor thermal stability, and is brittle, and at the same time, a platinum plating layer is required on the surface thereof. To improve its conductivity, greatly increasing the cost of preparation. Graphene has high transparency to almost all infrared rays, which is beneficial to improve the utilization of light energy. An increase in light transmittance results in a decrease in carrier density, but since graphene has a very high carrier mobility, a certain conductivity can be ensured even if the carrier density is very small. Graphene can be prepared as a flexible transparent film electrode, which overcomes the weakness of the indium tin oxide brittle.

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Graphene has good electrical properties and can be used as a receptor material in solar cells. Graphene can be combined with organic polymer materials to form a large interface to the acceptor, which is beneficial to the diffusion rate of excitons in the battery and the increase of carrier mobility, and eliminates secondary aggregation due to the destruction of the charge transport path. For example, graphene can be combined with the donor material P3HT or P3OT to shorten the charge transport path; the acceptor material C60 can also be grafted onto the graphene surface to further enhance the electronic conductivity. When graphene is used as an acceptor material, its structural defects will reduce the electron transporting ability, increase the recombination of electron holes, and can not significantly improve the photoelectric conversion efficiency of the battery, thereby reducing the defects of graphene, and considering graphene and donor. The interaction and matching of materials is the focus of attention.

In addition, graphene materials are also applied to the photoanodes of various types of solar cells. Depositing a graphene film on the surface of Si facilitates surface passivation, doping and formation of heterojunction of Si-based Schottky cells, and effectively improves the photoelectric conversion efficiency of the battery. In the dye-sensitized solar cell, the composite of graphene and titanium dioxide is used as a photoanode, which is intended to make full use of the advantages of both, improve the electron transport speed, reduce the recombination of electron holes, and further increase the adsorption of the dye by the photoanode. Improve photoelectric conversion efficiency.

A large number of studies have shown that the use of graphene in solar cells is superior and feasible. The emergence of graphene solves some technical problems in the photovoltaic industry. Graphene plays a very important role in the photovoltaic industry.