Featured Research

from universities, journals, and other organizations

Increasing Charge Mobility In Single Molecular Organic Crystals

Date:
April 7, 2005
Source:
Brookhaven National Laboratory
Summary:
Flexible displays that can be folded up in your pocket? More accurate biological and chemical sensors? Biocompatible electronics? In research that may help determine the best materials for a wide range of future electronics applications, a scientist from the U.S. Department of Energy’s Brookhaven National Laboratory will report on the intrinsic electronic properties of molecular organic crystals at the March 2005 meeting of the American Physical Society.

Vladimir Butko.
Credit: Photo courtesy of Brookhaven National Laboratory

LOS ANGELES, CA - Flexible displays that can be folded up in your pocket? More accurate biological and chemical sensors? Biocompatible electronics? In research that may help determine the best materials for a wide range of future electronics applications, a scientist from the U.S. Department of Energy’s Brookhaven National Laboratory will report on the intrinsic electronic properties of molecular organic crystals at the March 2005 meeting of the American Physical Society. Brookhaven materials scientist Vladimir Butko will describe the experimental techniques and key findings on Monday, March 21, at 3:42 p.m. in room 152 of the Los Angeles Convention Center.

Organic materials are particularly attractive for potential applications such as flexible displays, or so-called “electronic paper,” because they are inherently flexible. “Imagine a computer screen that you could crumple or fold like a sheet of plastic film,” Butko says. Yet for this and any other electronics application, the materials must also be able to carry an electric current.

“These organic materials, by themselves, have almost no charge carriers — electrons or “holes” [the absence of electrons] — to carry current,” Butko says. “They act as insulators. But if we inject charge carriers, we can sometimes create organic devices such as field-effect transistors [FETs], through which charge will flow.”

To find out which materials have the best potential for carrying current, Butko has been studying single crystals of molecular organic materials such as pentacene and rubrene. Though these crystals themselves may not have direct applications, they provide the simplest form in which to study the materials’ intrinsic electronic properties — unaffected by factors that might play a role in larger samples such as polycrystalline thin films.

The key, says Butko, is to know whether the injected charge carriers will have a high mobility or stay localized. The most stringent test of localization is to cool such a device to very low temperatures: somewhat close to absolute zero, which is approximately -273 degrees Celsius. At these low temperatures the mobility edge can be probed without the complication of thermal activation -- a process that assists charge carrier transport in semiconductors due to large thermal energy at high temperatures. The studies were done using a physical properties measurement system (PPMS) and electrometers at the Los Alamos National Laboratory.

In his talk, Butko will present first evidence for low-temperature, quasi-temperature-independent transport of injected charge in a crystalline organic FET. “These materials, which also have the highest charge mobility at room temperature among organic FETs, can be most useful for electronic applications,” Butko says.

Once scientists identify the best crystals, they will use thin-film methods to test their applicability for electronic devices from e-paper to large-format display screens.

This research was done in collaboration with Arthur Ramirez, David Lang and Xiaoliu Chi from Bell Laboratories, and Jason Lashley from Los Alamos National Laboratory, and was funded in part by the Office of Basic Energy Sciences within the U.S. Department of Energy’s Office of Science.


Story Source:

The above story is based on materials provided by Brookhaven National Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

Brookhaven National Laboratory. "Increasing Charge Mobility In Single Molecular Organic Crystals." ScienceDaily. ScienceDaily, 7 April 2005. <www.sciencedaily.com/releases/2005/03/050326012522.htm>.
Brookhaven National Laboratory. (2005, April 7). Increasing Charge Mobility In Single Molecular Organic Crystals. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2005/03/050326012522.htm
Brookhaven National Laboratory. "Increasing Charge Mobility In Single Molecular Organic Crystals." ScienceDaily. www.sciencedaily.com/releases/2005/03/050326012522.htm (accessed September 1, 2014).

Share This




More Matter & Energy News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Australian Airlines Relax Phone Ban Too

Australian Airlines Relax Phone Ban Too

Reuters - Business Video Online (Aug. 26, 2014) Qantas and Virgin say passengers can use their smartphones and tablets throughout flights after a regulator relaxed a ban on electronic devices during take-off and landing. As Hayley Platt reports the move comes as the two domestic rivals are expected to post annual net losses later this week. Video provided by Reuters
Powered by NewsLook.com
Hurricane Marie Brings Big Waves to California Coast

Hurricane Marie Brings Big Waves to California Coast

Reuters - US Online Video (Aug. 26, 2014) Huge waves generated by Hurricane Marie hit the Southern California coast. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Chinese Researchers Might Be Creating Supersonic Submarine

Chinese Researchers Might Be Creating Supersonic Submarine

Newsy (Aug. 26, 2014) Chinese researchers have expanded on Cold War-era tech and are closer to building a submarine that could reach the speed of sound. Video provided by Newsy
Powered by NewsLook.com
Breakingviews: India Coal Strained by Supreme Court Ruling

Breakingviews: India Coal Strained by Supreme Court Ruling

Reuters - Business Video Online (Aug. 26, 2014) An acute coal shortage is likely to be aggravated as India's supreme court declared government coal allocations illegal, says Breakingviews' Peter Thal Larsen. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins