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Ultra-thin solar blind extreme ultraviolet imager developed

Date:
December 8, 2010
Source:
Interuniversity Microelectronics Centre (IMEC)
Summary:
Researchers have developed an ultra-thin hybrid AlGaN-on-Si-based extreme ultraviolet (EUV) imager with only 10m pixel-to-pixel pitch. The wide-bandgap material (AlGaN) provides insensitivity to visible wavelengths and enhanced UV radiation hardness compared to silicon. Backside illumination in a hybrid design was used to achieve a very small pitch-to-pitch (10m only). The novel imager shows an excellent detection down to a wavelength of 1nm.

At the International Electron Devices Meeting in San Francisco, researchers with Imec presented an ultra-thin hybrid AlGaN-on-Si-based extreme ultraviolet (EUV) imager with only 10m pixel-to-pixel pitch. The wide-bandgap material (AlGaN) provides insensitivity to visible wavelengths and enhanced UV radiation hardness compared to silicon. Backside illumination in a hybrid design was used to achieve a very small pitch-to-pitch (10m only). The novel imager shows an excellent detection down to a wavelength of 1nm.

Ultraviolet detection is of particular interest for solar science, EUV microscopy and advanced EUV lithography tools. Sensors using wide-bandgap materials overcome the drawbacks of Si-based sensors such as their sensitivity to UV radiation damage and the need for filters to block the unnecessary visible and infrared radiation.

Imec's backside illuminated EUV imager is based on a state-of-the-art hybrid design integrating an AlGaN sensor on a silicon readout chip. A submicron thick AlGaN layer was grown on a Si(111) wafer using molecular beam epitaxy and a focal plane array of 256x256 pixels with a pixel-to-pixel pitch of 10 micron was processed. Each pixel contains a Schottky diode optimized for backside illumination. A custom read-out chip, based on capacitance transimpedance amplifiers, was fabricated in 0.35m CMOS technology. The AlGaN wafer and read-out chip were post-processed with indium solder bumps with 10m pixel-to-pixel pitch achieving excellent uniformity. The focal plane array and read-out chip were assembled using flip-chip bonding and subsequently the silicon substrate was locally removed to enable backside illumination of the active AlGaN layer. Finally, the imager was packaged and wire-bonded. Measurements demonstrated an excellent response down to a wavelength of 1nm.

These results were obtained in collaboration with CRHEA/CNRS (France) and the Royal Observatory of Belgium in the framework of the BOLD project of the European Space Agency (ESA).


Story Source:

The above story is based on materials provided by Interuniversity Microelectronics Centre (IMEC). Note: Materials may be edited for content and length.


Cite This Page:

Interuniversity Microelectronics Centre (IMEC). "Ultra-thin solar blind extreme ultraviolet imager developed." ScienceDaily. ScienceDaily, 8 December 2010. <www.sciencedaily.com/releases/2010/12/101208083529.htm>.
Interuniversity Microelectronics Centre (IMEC). (2010, December 8). Ultra-thin solar blind extreme ultraviolet imager developed. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2010/12/101208083529.htm
Interuniversity Microelectronics Centre (IMEC). "Ultra-thin solar blind extreme ultraviolet imager developed." ScienceDaily. www.sciencedaily.com/releases/2010/12/101208083529.htm (accessed April 18, 2014).

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