CREDIT: Wake Forest University |
Flexible electronics, like a handheld computer that rolls
up like a magazine or a video display embedded in a shirtsleeve are no longer
limited to the realm of sci-fi, but they are still generally too expensive for
the consumer market. Part of the problem is that semiconductor compounds
that move electricity between different materials of varying conductivity tend to be inflexible or brittle.
Oana Jurchescu, an assistant professor of physics at Wake
Forest University in North Carolina, developed this novel technique along with
her associates Yaochuan Mei, also of Wake Forest, and John Anthony from the
University of Kentucky. Her organic semiconductor, called
triethylgermylethynyl-substituted anthradithiophene (diF-TEG ADT) can rest
comfortably on a variety of substances without breaking or compromising its
functionality. Furthermore, diF-TEG ADT is inexpensive and conducts electricity
efficiently, even when applied over large areas.
"These organic semiconductors are new to us and to the
entire organic electronics community," Jurchescu told us. She explained
that researchers can prepare diF-TEG ADT in an organic solvent and then spread
it in a very thin layer across the desired medium.
"We can put them on plastic, on clothes, on human
skin," Jurchescu said. "We have electronics embedded in these areas
that can only be addressed by organics." Inorganic semiconductors, often
made with silicon, generate very high temperatures and, as a result, don't play
nicely with anything that can melt or burn.
Researchers spread the semiconductors via a thin film that
comes not from a paint can, but rather a complex process of mixing chemical
compounds, diluting and drying them, and creating crystals from the resulting
substances. After adding the diF-TEG ADT to an organic solvent, researchers
could spread it across glass and measure its effectiveness.
Jurchescu's trials are promising so far, but the
semiconductors only worked effectively when spread across a relatively small
area. "We want to use organics for large area displays and
applications," she said. "Most semiconductors are incapable of
addressing those applications." The next step will be to increase the size
of the spray paint's effective area.
Semiconductors, Jurchescu believes, are "at the heart
of all electronic applications," but she does not envision any one
specific technology for her spray paint's future possibilities. "The
technology itself is very versatile, and can be applied to so many
things," she said. While she expressed interest in making clothes with
built-in displays and embedding electronics in skin, Jurchescu also thinks her
technology could help make large solar cells more efficient.
Developing the technology that powers flexible electronics
is just as vital as developing the flexible electronics themselves. The next
big thing — whatever it turns out to be — may be powered by a sprayable film
rather than silicon or gold.
Credentials:- TechNews Daily
Credentials:- TechNews Daily
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