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.
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 cells (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.
"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 perovskite solar cells 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 perovskite 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.
This research has been supported by the National Research Foundation of Korea Grant (NRF) and the Creative Research Initiative (CRI) program. This work has been also supported by the Development Program of the Korea Institute of Energy Research (KIER) and UNIST.
Gi-Hwan Kim, et al., "Fluorine Functionalized Graphene Nano Platelets for Highly Stable Inverted Perovskite Solar Cells," Nano Letters, (2017).
Public Relations Team
Ulsan National Institute of Science and Technology (UNIST)
E. email@example.com | T. 052-217-1223 | M. 010-3880-6622
Off: Main Administration Bldg. 201, Room 407
JooHyeon heo | EurekAlert!
Less is more to produce top-notch 2D materials
20.11.2017 | The Agency for Science, Technology and Research (A*STAR)
The stacked colour sensor
16.11.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
20.11.2017 | Earth Sciences
20.11.2017 | Earth Sciences
20.11.2017 | Life Sciences