Researchers develop highly stable perovskite solar cells

UNIST researchers develop highly stable perovskite solar cells
Highly stable p-i-n perovskite PV, prepared via a mechanochemical ball-milling method. Credit: UNIST

A recent study, affiliated with UNIST has presented a highly stable perovskite solar cells (PSCs), using edged-selectively fluorine (F) functionalized graphene nano-platelets (EFGnPs). This breakthrough has gotten much attention as it is made out of fluorine, a low-cost alternative to gold.

A recent study, affiliated with UNIST has presented a highly stable perovskite (PSCs), using edged-selectively (F) functionalized graphene nano-platelets (EFGnPs). This breakthrough has gotten much attention as it is made out of fluorine, a low-cost alternative to gold.

This study has been jointly led by Professor Jin Young Kim in the School of Energy and Chemical Engineering at UNIST in collaboration with Dong Suk Kim of Korea Institute of Energy Research (KIER). Assistant Professor Gi-Hwan Kim in the School of Energy and Chemical Engineering at UNIST partook in this study, as the lead author. The findings of the study has been published in the September issue of the prestigious journal, Nano Letters.

Perovskite solar (PSCs) have attracted more attention in the past few years, as the next-generation solar cells with the potential to surpass silicon cells' efficiency. Nevertheless, stability and cost issues in PSCs seem to block further advancements toward commercialization.

The perovskite materials are easily decomposed in moisture conditions. They cannot survive even for one day without proper encapsulation and this results in low stability. To solve these issues and make progress toward the commercialization of PSCs, Professor Kim and his 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.

UNIST researchers develop highly stable perovskite solar cells
Highly-stable perovskite solar cells, developed by Professor Jin Young Kim's team. Credit: UNIST
"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. "

"This study overcame weakness of that have high efficiencies but low stability," says Professor Jin Young Kim. "This breakthrough holds substantial promise as the base technology for the application of the next-generation solar cells, as well as various IoT devices and displays," says Professor Jin Young Kim.

The newly-developed perovskite solar cell device was fabricated using solution processes, a process that involves the coating materials on a flexible film. Using this process allows the future application of solar cells to wearable devices. The next-generation solar cells are advantageous in that they have a simple manufacturing process and a low manufacturing cost, compared the existing silicon-based inorganic electronic devices.


Explore further

Perovskite solar cells reach record long-term stability, efficiency over 20 percent

More information: Gi-Hwan Kim et al, Fluorine Functionalized Graphene Nano Platelets for Highly Stable Inverted Perovskite Solar Cells, Nano Letters (2017). DOI: 10.1021/acs.nanolett.7b03225
Journal information: Nano Letters

Citation: Researchers develop highly stable perovskite solar cells (2017, October 25) retrieved 24 May 2019 from https://phys.org/news/2017-10-highly-stable-perovskite-solar-cells.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
12 shares

Feedback to editors

User comments

Oct 25, 2017
JOKE: Do you REALLY want to make Shirts & Pants out of them?
What for So much Energy? Cellphones do not need that much Energy. May be Hearing Aids?
What Else? Do you want to make them Transparent Too ?

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more