Featured Research

from universities, journals, and other organizations

A First: Scientists Control The Properties Of Semiconductor Devices Using Organic Molecules

Date:
March 13, 2000
Source:
Weizmann Institute
Summary:
Weizmann Institute scientists have made an important step towards harnessing organic molecules to future electronics. Reported in the March 9th issue of Nature, their approach places common semiconductor-based devices -- for the first time ever -- under the control of organic molecules.

Weizmann Institute scientists have made an important step towards harnessing organic molecules to future electronics. Reported in the March 9th issue of Nature, their approach places common semiconductor-based devices -- for the first time ever -- under the control of organic molecules.

Related Articles


The functions of organic molecules are so diverse that their inclusion in electronics would provide an extensive range of possibilities. However, the observation of these molecules' electrical properties has up until now been impeded by incongruities in the structure of organic molecules themselves. Layers of organic molecules that are used in this kind of research contain 'pinholes' -- small defects that are very difficult to detect but radically sway conductance. Scientists were unable to determine whether their measurements resulted from the passage of the current through the organic molecules or through a pinhole. But the new approach circumvents this problem.

The Weizmann scientists chose to analyze the molecules indirectly -- by focusing on the influence that the molecules were suspected to have on semiconductors. Using a series of molecules synthesized by Prof. Abraham Shanzer of the Weizmann Institute's Organic Chemistry Department, Ayelet Vilan, a graduate student working with Prof. David Cahen of the Materials and Interfaces Department, constructed a one-molecule-thick layer (monolayer) of very short organic molecules.

Vilan placed the monolayer on a common semiconductor, GaAs, and directed an electric current through it. The monolayer was so thin that, for the most part, the electric current passed by the molecules without interacting with them. This fact meant that it was of minimal importance if the electrons went via a molecule or a pinhole. (However, it is important to note that while the organic molecules barely affect the passage of the electrical current through them, they very much influence the electric properties of the semiconductor.)

The decision to work with monolayers of organic molecules compelled Vilan to develop a new method for preparing semiconductor devices. The technique is founded on a widely used semiconductor device (diode), which is comprised of a semiconductor connected to a metal. She inserted the organic monolayer between these two components. Since the organic molecules were 'sandwiched' between the semiconductor and the metal sheet, it was critically important to ensure that the delicate monolayer would not be crushed underneath the metal sheet. Vilan, building on the findings of Ellen Moons, one of Cahen's former students, reworked a method used in other fields to suit the device. She used a thin gold leaf as the metal sheet and gently floated it onto the monolayer. Thus, the monolayer remained intact.

The scientists found that changing the type of organic molecules in a monolayer led to a predictable, systematic change in the electrical characteristics of the device. Thus, not only were they able to control the properties of the semiconductor, but they also were able to predict the kind of control that would be exerted by different types of organic molecules.

"This study introduces a feasible way to incorporate organic molecules into electronic devices," says Vilan. "But mainly, it provides new insights into the emerging field of molecular electronics. So little is known about the effects that occur between molecules and the electric conductors we normally use. This approach may provide a basis for the design of novel types of semiconductor-based devices, from improvements in relatively simple devices such as solar cells, to possible new types of computer chips."


Story Source:

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


Cite This Page:

Weizmann Institute. "A First: Scientists Control The Properties Of Semiconductor Devices Using Organic Molecules." ScienceDaily. ScienceDaily, 13 March 2000. <www.sciencedaily.com/releases/2000/03/000313081304.htm>.
Weizmann Institute. (2000, March 13). A First: Scientists Control The Properties Of Semiconductor Devices Using Organic Molecules. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2000/03/000313081304.htm
Weizmann Institute. "A First: Scientists Control The Properties Of Semiconductor Devices Using Organic Molecules." ScienceDaily. www.sciencedaily.com/releases/2000/03/000313081304.htm (accessed October 25, 2014).

Share This



More Matter & Energy News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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