Featured Research

from universities, journals, and other organizations

Oxide thin films to create new field of oxide electronics

Date:
March 7, 2012
Source:
North Carolina State University
Summary:
Researchers have developed the first functional oxide thin films that can be used efficiently in electronics, making new high-power devices and sensors possible. This is the first time researchers have been able to produce positively-charged and negatively-charged conduction in a single oxide material, launching a new era in oxide electronics.

Researchers from North Carolina State University have developed the first functional oxide thin films that can be used efficiently in electronics, opening the door to an array of new high-power devices and smart sensors. This is the first time that researchers have been able to produce positively charged (p-type) conduction and negatively charged (n-type) conduction in a single oxide material, launching a new era in oxide electronics.

To make functional electronic devices, you need materials with a "p-n junction," where the positively charged and negatively charged materials meet. Solid state silicon electronics achieved this decades ago, but are limited by the amount of power and temperature they can handle. Oxide materials are an attractive alternative to silicon because they can handle more power.

However, attempts to pair different p-type and n-type oxide materials previously ran into problems at the interface of the two materials -- the p-n junction was always inefficient.

"We avoided this problem by using the same material for p- and n-type conduction," says Dr. Jay Narayan, the John C. Fan Distinguished Chair Professor of Materials Science and Engineering at NC State and co-author of a paper describing the research. "This is a new era in oxide electronics."

Specifically, Narayan's team used lasers to create positively charged nickel oxide (NiO) thin films, then converted the top layer of those films to n-type. Because they could control the thickness of the n-layer, the researchers were able to control the depth and characteristics of the p-n junction. "This spatial and temporal selectivity provides unprecedented control to 'write' p-n junctions by laser beams and create ultra high-density device features for oxide electronics," Narayan says.

By enabling the development of oxide electronics, the research allows for the creation of a host of new technologies in a wide array of fields. For example, because oxides can handle higher voltages than silicon-based electronics, the material could be used to create higher voltage switches for the power grid, which would allow more power to be transmitted on the existing infrastructure. Similarly, this would allow the development of sensors for use in higher-temperature environments, because oxides are more stable at high temperatures.

Oxide electronics could also be used to create new sensors for monitoring gases, since oxide materials can interact with oxygen. These sensors could have a variety of applications, including testing for air toxicity in security situations.

"These materials are also transparent," Narayan says, "so this makes transparent electronics possible."

The paper, "Controlled p-type to n-type conductivity transformation in NiO thin films by ultraviolet-laser irradiation," is published online in the Journal of Applied Physics. The paper was co-authored by Pranav Gupta, a Ph.D. student at NC State; Narayan; and Drs. Titas Dutta and Siddhartha Mal, both former Ph.D. students at NC State now working at Intel. The research was funded by the National Science Foundation.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pranav Gupta, Titas Dutta, Siddhartha Mal, Jagdish Narayan. Controlled p-type to n-type conductivity transformation in NiO thin films by ultraviolet-laser irradiation. Journal of Applied Physics, 2012; 111 (1): 013706 DOI: 10.1063/1.3671412

Cite This Page:

North Carolina State University. "Oxide thin films to create new field of oxide electronics." ScienceDaily. ScienceDaily, 7 March 2012. <www.sciencedaily.com/releases/2012/03/120307112458.htm>.
North Carolina State University. (2012, March 7). Oxide thin films to create new field of oxide electronics. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2012/03/120307112458.htm
North Carolina State University. "Oxide thin films to create new field of oxide electronics." ScienceDaily. www.sciencedaily.com/releases/2012/03/120307112458.htm (accessed April 18, 2014).

Share This



More Matter & Energy News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Small Reactors Could Be Future of Nuclear Energy

Small Reactors Could Be Future of Nuclear Energy

AP (Apr. 17, 2014) After the Fukushima nuclear disaster, the industry fell under intense scrutiny. Now, small underground nuclear power plants are being considered as the possible future of the nuclear energy. (April 17) Video provided by AP
Powered by NewsLook.com
Horseless Carriage Introduced at NY Auto Show

Horseless Carriage Introduced at NY Auto Show

AP (Apr. 17, 2014) An electric car that proponents hope will replace horse-drawn carriages in New York City has also been revealed at the auto show. (Apr. 17) Video provided by AP
Powered by NewsLook.com
Honda's New ASIMO Robot, More Human-Like Than Ever

Honda's New ASIMO Robot, More Human-Like Than Ever

AFP (Apr. 17, 2014) It walks and runs, even up and down stairs. It can open a bottle and serve a drink, and politely tries to shake hands with a stranger. Meet the latest ASIMO, Honda's humanoid robot. Duration: 00:54 Video provided by AFP
Powered by NewsLook.com
German Researchers Crack Samsung's Fingerprint Scanner

German Researchers Crack Samsung's Fingerprint Scanner

Newsy (Apr. 16, 2014) German researchers have used a fake fingerprint made from glue to bypass the fingerprint security system on Samsung's new Galaxy S5 smartphone. Video provided by Newsy
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