Nav: Home

Marcus regime in organic devices: Interfacial charge transfer mechanism verified

May 09, 2019

Charge transfer processes play a fundamental role in all electronic and optoelectronic devices. For devices based on organic thin-film technology, these include the injection of the charge carriers via the metallic contacts and the charge transport in the organic film itself. Injection processes at the contacts are of particular interest here because the contact resistances at the interfaces must be minimized for optimum device efficiency. However, such internal interfaces are difficult to access and therefore not yet understood very well.

The team of cfaed research group leader Frank Ortmann (Computational Nanoelectronics Group), together with researchers from Spain, Belgium and Germany, has now shown in a study that the electronic transport mechanism when injected into an organic film can be described by the so-called Marcus hopping model known from physical chemistry. The model was developed by the American chemist Rudolph Arthur Marcus. Comparative theoretical and experimental investigations unequivocally identified the transport regimes predicted in the Marcus theory. "The predictions derived by R.A. Marcus in the context of chemical synthesis in the 1950s, in particular the so-called 'inverted Marcus regime', could only be confirmed many decades later by systematic experiments on chemical reactions. For his important theoretical contributions, R.A. Marcus received the Nobel Prize for Chemistry in 1992 ", says Ortmann.

"Now, the observation of the 'Inverted Marcus Region', in which a higher voltage generates a lower current, succeeded for the first time in an organic transistor, in which the injection voltage can be actively controlled", Ortmann continues. This leads to a better understanding of electronic and optoelectronic organic devices in general. The publication has been published on 7th May, 2019 in the journal "Nature Communications".
-end-
About the Computational Nanoelectronics Group

The research group at the Center for Advancing Electronics Dresden (cfaed) headed by Dr. Frank Ortmann investigates electronic properties and charge transport properties of novel semiconductor materials. Here, organic semiconductors are currently an important focus of the work, which is funded by the German Research Foundation under the Emmy Noether Program. The group has been based at the cfaed since 2017. Info: https://cfaed.tu-dresden.de/ortmann-home

Media inquiries:

Matthias Hahndorf
Center for Advancing Electronics Dresden, TU Dresden
Head of Communications
Tel.: +49 351 463-42847
Email: matthias.hahndorf@tu-dresden.de

Technische Universität Dresden

Related Chemistry Articles:

Coordination chemistry and Alzheimer's disease
It has become evident recently that the interactions between copper and amyloid-β neurotoxically impact the brain of patients with Alzheimer's disease.
Can ionic liquids transform chemistry?
Table salt is a commonplace ingredient in the kitchen, but a different kind of salt is at the forefront of chemistry innovation.
Principles for a green chemistry future
A team led by researchers from the Yale School of Forestry & Environmental Studies recently authored a paper featured in Science that outlines how green chemistry is essential for a sustainable future.
Sugar changes the chemistry of your brain
The idea of food addiction is a very controversial topic among scientists.
Reflecting on the year in chemistry
A lot can happen in a year, especially when it comes to science.
Better chemistry through tiny antennae
A research team at The University of Tokyo has developed a new method for actively controlling the breaking of chemical bonds by shining infrared lasers on tiny antennae.
Chemistry in motion
For the first time, researchers have managed to view previously inaccessible details of certain chemical processes.
Researchers enrich silver chemistry
Researchers from Russia and Saudi Arabia have proposed an efficient method for obtaining fundamental data necessary for understanding chemical and physical processes involving substances in the gaseous state.
The chemistry behind kibble (video)
Have you ever thought about how strange it is that dogs eat these dry, weird-smelling bits of food for their entire lives and never get sick of them?
Top 10 chemistry start-ups
Starting a new chemistry-based company is one part discovery, one part risk.
More Chemistry News and Chemistry Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Listen Again: Meditations on Loneliness
Original broadcast date: April 24, 2020. We're a social species now living in isolation. But loneliness was a problem well before this era of social distancing. This hour, TED speakers explore how we can live and make peace with loneliness. Guests on the show include author and illustrator Jonny Sun, psychologist Susan Pinker, architect Grace Kim, and writer Suleika Jaouad.
Now Playing: Science for the People

#565 The Great Wide Indoors
We're all spending a bit more time indoors this summer than we probably figured. But did you ever stop to think about why the places we live and work as designed the way they are? And how they could be designed better? We're talking with Emily Anthes about her new book "The Great Indoors: The Surprising Science of how Buildings Shape our Behavior, Health and Happiness".
Now Playing: Radiolab

The Third. A TED Talk.
Jad gives a TED talk about his life as a journalist and how Radiolab has evolved over the years. Here's how TED described it:How do you end a story? Host of Radiolab Jad Abumrad tells how his search for an answer led him home to the mountains of Tennessee, where he met an unexpected teacher: Dolly Parton.Jad Nicholas Abumrad is a Lebanese-American radio host, composer and producer. He is the founder of the syndicated public radio program Radiolab, which is broadcast on over 600 radio stations nationwide and is downloaded more than 120 million times a year as a podcast. He also created More Perfect, a podcast that tells the stories behind the Supreme Court's most famous decisions. And most recently, Dolly Parton's America, a nine-episode podcast exploring the life and times of the iconic country music star. Abumrad has received three Peabody Awards and was named a MacArthur Fellow in 2011.