Imec unveils fully organic imager for X-ray applications

Jun 13, 2013
Fully-organic, flexible imager developed by imec, Holst Centre and Philips Research

At this week's International Image Sensor Workshop (IISW 2013, Snowbird, Utah, June 12-16 2013), imec and Holst Centre presented a large-area fully-organic photodetector array fabricated on a flexible substrate. The imager is sensitive in the wavelength range suitable for x-ray imaging applications.

Because of their very high absorption coefficient, organic semiconductors allow extremely thin active layers (10 to 50 nm). Also, given their low processing temperature, they can be processed on foils. As a result, organic imagers can be more robust and light-weight compared to their traditional counterparts and may be used for conformal coating of randomly shaped substrates. Moreover, the wide variety of organic molecules available ensures that the properties of the active layer can be tuned to applications requiring specific wavelength ranges.

The presented imager is sensitive in the between 500 and 600 nm, making it compatible with typical scintillators and therefore suitable for x-ray imaging applications. It was fabricated by thermally evaporating an ultrathin (submicron) photosensitive layer of small (SubPc/C60) on top of an organic readout circuit. A semi-transparent top contact enables front-side illumination. The readout backplane was manufactured on six inch foil-laminated wafers. It consists of pentacene-based thin-film transistors (TFTs) in arrays of 32x32 pixels with varying pitch (1 mm and 200 µm). To prevent degradation of the organic semiconductors in the air, the photodetector array is encapsulated. The imager was characterized under illumination with a calibrated green light-emitting diode (LED), yielding a linearly increasing from the incident power of 3 µW/cm2. Dark is below 10-6 A/cm2 at a bias voltage of -2V.

"This latest achievement is a significant step forward in not only finding the optimal materials, but pinpointing the best ways to process materials into reliable organic circuits and systems with state-of-the-art performance," said Paul Heremans, technology director at the /Holst Centre. "Once again, we're proud to demonstrate how imec's top-notch research leads to relevant industrial solutions, and subsequently brings added value to our partners' businesses."

This research results are presented in collaboration with Philips Research, at the (2013 International Image Sensor Workshop (IISW), sponsored by the International Image Sensor Society (IISS), June 12-16, 2013.

Explore further: New technology reduces size of spinal stimulator implants

More information: www.imec.be/

add to favorites email to friend print save as pdf

Related Stories

Ultra-thin solar blind EUV imager reported by Imec

Dec 08, 2010

Yesterday at the International Electron Devices Meeting in San Francisco imec presents an ultra-thin hybrid AlGaN-on-Si-based extreme ultraviolet (EUV) imager with only 10µm pixel-to-pixel pitch. The wide-bandgap material ...

Recommended for you

Form Devices team designs Point as a house sitter

8 hours ago

A Scandinavian team "with an international outlook" and good eye for electronics, software and design aims to reach success with what they characterize as "a softer take" on home security. Their device is ...

Man pleads guilty in New York cybercrime case

11 hours ago

A California man has pleaded guilty in New York City for his role marketing malware that federal authorities say infected more than a half-million computers worldwide.

Dish restores Turner channels to lineup

20 hours ago

Turner Broadcasting channels such as Cartoon Network and CNN are back on the Dish network after being dropped from the satellite TV provider's lineup during contract talks.

LiquidPiston unveils quiet X Mini engine prototype

Nov 21, 2014

LiquidPiston has a new X Mini engine which is a small 70 cubic centimeter gasoline powered "prototype. This is a quiet, four-stroke engine with near-zero vibration. The company said it can bring improvements ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.