NSF Awards $467,000 to U of A Physicists for Black Phosphorus Study

Hugh Churchill, assistant professor of physics, directs the Quantum Device Laboratory at the University of Arkansas.
Photo by Russell Cothren

Hugh Churchill, assistant professor of physics, directs the Quantum Device Laboratory at the University of Arkansas.

FAYETTEVILLE, Ark. – The National Science Foundation has awarded $466,954 to University of Arkansas physicists to study the ultra-thin material black phosphorous for its potential use in fiber-optic communication.

Black phosphorous, which can be thinned down to a single layer of atoms, is an ultra-thin semiconductor that has the potential to power optoelectronic devices, which use both light and electricity. Some current optoelectronic devices are solar cells and light-emitting diodes, better known as LEDs.

“Black phosphorous exhibits strong potential for applications from thin-film electronics to infrared optoelectronics,” said Hugh Churchill, an assistant professor of physics and the principal investigator on the project.

The research will shed light on the long-term potential for a new kind of optoelectronic device that would feature an optical switch – the kind needed for fiber-optic communication – in which electricity could control light. Such a switch may be smaller, faster and more energy-efficient than current technologies.

Churchill and Salvador Barraza-Lopez, an assistant professor of physics serving as co-principal investigator on the project, will model and observe the behavior of excitons in black phosphorus. When a semiconductor absorbs light, an electron moves up in energy and leaves behind a hole.  This electron and hole can bind together, forming an exciton.

In traditional semiconducting materials such as silicon, excitons are formed at extremely low temperatures, just a few degrees above absolute zero, or they disappear almost instantly. They form at much higher temperatures in black phosphorous, Churchill said.

“These excitons are extraordinarily stable even at room temperature,” he said. “Their formation and stability in black phosphorous opens the door for not only observing their behavior at higher temperatures, but the possibility of manipulating them before they disappear.”

About the University of Arkansas: The University of Arkansas provides an internationally competitive education for undergraduate and graduate students in more than 200 academic programs. The university contributes new knowledge, economic development, basic and applied research, and creative activity while also providing service to academic and professional disciplines. The Carnegie Foundation classifies the University of Arkansas among only 2 percent of universities in America that have the highest level of research activity. U.S. News & World Report ranks the University of Arkansas among its top American public research universities. Founded in 1871, the University of Arkansas comprises 10 colleges and schools and maintains a low student-to-faculty ratio that promotes personal attention and close mentoring.

Contacts

Hugh Churchill, assistant professor, Department of Physics
J. William Fulbright College of Arts and Sciences
479-575-7235, hchurch@uark.edu

Chris Branam, research communications writer/editor
University Relations
479-575-4737, cwbranam@uark.edu


Editor-selected comments will be published below. No abusive material, personal attacks, profanity, spam or material of a similar nature will be considered for publication.

comments powered by Disqus

Headlines

Adrienne Gaines and Scott Osborn Named Academic Advisors of the Year

Adrienne Gaines and Scott Osborn, both from the College of Engineering, have been selected by the University of Arkansas Academic Advising Council as 2017-18 outstanding academic advisors.

Paula Lantz to Present Lecture on Social Impact Bonds and Mental Health Interventions

Lantz will discuss what she and her colleagues have learned regarding the potential and challenges of this model.

Arkansas Paws in Prison Coordinator Visits U of A April 7

Tricia Dodson-Ross, the Paws in Prison coordinator for the Arkansas Department of Correction, will speak at 11 a.m. Friday, April 7, in Northwest Quad B-108. With her will be ambassador Chloe.

Presentation Today on Polymeric Drug Carriers and Mass Release Control

Anna Trusek-Holownia of Wroclaw University of Science and Technology will give a short presentation at 11 a.m. today in Room 123 of the Cato Springs Research Center.

Internationally Renowned Flautist Susan Milan to Give Recital

Internationally renowned flautist Susan Milan will be in Fayetteville on April 2 and 3 to share her music and give a lecture for the Department of Music.

Newswire Daily