A recent study, affiliated with UNIST and the Korea Institute of Energy Research (KIER),has shown a highly stable perovskite solar cells (PSCs), using edged-selectively fluorine (F) functionalized graphene nano-platelets (EFGnPs). This breakthrough is interesting since it is made out of fluorine, a low-cost alternative to gold.

PSCs made stable using graphene and fluorine image

To tackle the issue of perovskite materials' sensitivity to moisture and make progress toward the commercialization of PSCs, the team introduced a highly stable p-i-n structure for PSCs using fluorine functionalized EFGnPs to fully cover the perovskite active layer and protect against the ingress of water for high-stability PSCs.

"Fluorocarbons, such as polytetrafluoroethylene (Teflon) are well-known for their superhydrophobic properties and comprise carbon fluorine (C-F) bonding," says Professor Gwi-Hwan Kim at UNIST. "By substituting carbon for fluorine, we have created a two-dimensional material with high hydrophobicity, like Teflon. Then, applied it to PSCs. "

The newly-developed perovskite solar cell device was fabricated using solution processes, a process that involves the coating perovskite materials on a flexible film. Using this process allows the future application of solar cells to wearable devices. This process is also less costly.



Integrated batteries?

So- can graphene layers be deposited on the backs of Perovskite panels?