New Dielectric Material Promises Radiation Resistant Transistors

Roll-up, transparent computers and displays are just one of the neat sci-fi gadgets a new material from Northwestern University may lead to.

DailyTech has in the past covered research into the effects of long term exposure to space bound radiation on humans. Though mankind has spent many years in space, the effects of prolonged exposure, even under ideal circumstances, are as of yet unknown. Though the human part of space travel is the most important part of the equation for manned flight, radiation poses a series threat to other participants ??“ especially electronics.

The effects of radiation on over-the-counter electronics are, in contrast, fairly well known. One of the most important parts of any electronic appliance, the transistor, is one of the most susceptible components to radiation. The problem comes from the absorptive properties of the silicon dioxide dielectrics that insulate a transistor's gate from its semiconductor components. Silicon dioxide captures radiation, which in turn creates electrons and holes. This process eventually builds up enough of a charge to short circuit the transistor, destroying it.

Not only do the human parts of a manned space odyssey need to be protected from the harsh environs of space, the fragile machinery that carries them will have to be as well. To address this concern, scientists at Northwestern University have delivered a new type of transistor to use in the International Space Station for testing. The prototype transistors were placed outside the space station where they will gain unprotected exposure to space radiation for the period of one year.

The transistors are based on a new material, dubbed SANDs for self-assembling nanodielectrics, and are the product of research into creating new types of dielectrics for future technology. The Northwestern group's goal was to create a dielectric material that was not only robust, but printable; something that could be used in transparent displays or flexible electronics. Ultimately they accomplished this by utilizing a dipping process to create thin films of self-assembled molecules.

Tobin Marks, Vladimir N. Ipatieff Research Professor of Chemistry at the Weinberg College of Arts and Sciences and Professor of Materials Science and Engineering at the McCormick School of Engineering and Applied Sciences explains, ???It??™s not just that these transistors are only good for outer space -- that??™s an illustration of just how tough they are. There is one technology on Earth, and only one, that will create as many features per unit time as a chip plant, and that??™s a modern newspaper printing plant, since the paper flies at hundreds of feet per second. Every time Intel wants to make a new chip, it costs billions of dollars and takes years to do. And yet every day they print a new New York Times. So we thought, could you use printing to create electronic circuits????

Preliminary tests with nuclear reactors show promising results for the SANDs. They appear to be highly resistant to radiation exposure, so NASA has taken a keen interest. Should the ISS tests return favorable results, the new material could revolutionize space electronics in terms of endurance and lifespan.

Aside from the obvious benefits in being radiation resistant, the group hopes to see the new material find use in many other fields -- wherever flexible, hardy and printable circuitry could find itself utilized. Some examples they cite range from solar panels to cell phones to flat-panel displays. One goal is to create inexpensive RFID tags to compliment or replace bar codes in stores. Cashiers could more easily interact with the tags, scanning an entire cart's contents at once along with alerting her if an item has reached its expiration date or informing her and the computer if the item is low on stock levels.

While the Northwestern group has already succeeded in making printed circuitry using their new material, they continue to research transistor materials that can be used as inks. The combination of a printable transistor with a highly durable dielectric substrate will likely lead to some very nifty electronics in the future.

Source: DailyTech

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