400x boost for graphene in solar cells: Page 2 of 2

July 12, 2018 // By Nick Flaherty
Researchers from the University of Kansas have connected a graphene layer with two other atomic layers (molybdenum diselenide and tungsten disulfide), thereby extending the lifetime of excited electrons in graphene by several hundred times. Credit: Matthew Bellus.
Two researchers from the University of Kansas in the US have found a way to dramatically improve the conductivity of graphene in solar cells.

To test out the material the researchers used an ultrashort laser pulse (0.1 picosecond) to liberate some of the electrons in MoSe2. By using another ultrashort laser pulse, they were able to monitor these electrons as they move to graphene. They found that these electrons move through the WS2 layer in about 0.5 picosecond on average and then stay mobile for about 400 ps in the graphene, a 400-fold improvement than a single layer of graphene, which they also measured in the same study.

The researchers also confirm the electrons tunnel back into the MoSe2 layer, and using different intermediate layers can control the tunnelling time for various applications.

www.ku.edu

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