UK universities increase solar cell efficiency by 30% with graphene and ferric chloride
2023-03-04 09:08:35
The University of Exeter announced that it has developed a carbon-based graphene-based material that is comparable to the transparent conductive material ITO (Indium Tin Oxide) while maintaining high light transmission. High conductivity transparent conductive material "GraphExeter". "In addition to being able to increase the conversion efficiency of solar cells by 30%, it is also expected to bring a revolution to wearable electronics" (University of Exeter). Details have been published in the academic journal Advanced Materials. The light transmittance of GraphExeter is about 87%, and the sheet resistance is about 15 Ω/□. In the past, graphene had a minimum light resistance of 30 Ω/□ regardless of the light transmittance. The sheet resistance of this new material broke this limit. In addition, the paper also describes that when the light transmittance of ITO, which is a transparent conductive material, is about 87%, the sheet resistance is about 60 to 90 Ω/□. However, the light transmittance of the material is slightly increased, and the sheet resistance value is drastically increased. GraphExeter uses a sandwich construction with a layer of ferric chloride (FeCl3) sandwiched between graphene sheets. According to the University of Exeter, with this configuration, "the conductivity can be increased (reducing the sheet resistance) while maintaining the light transmittance of graphene."
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