High Count Rate, Pixelated APDs for Direct X-Ray Detection

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$750,000.00
Award Year:
2007
Program:
SBIR
Phase:
Phase II
Contract:
DE-FG02-06ER84406
Agency Tracking Number:
81361S06-I
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Voxtel, Inc.
12725 SW Millikan Way, Suite 230, Beaverton, OR, 97005
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
124348652
Principal Investigator:
George Williams
Mr
(971) 223-5646
georgew@voxtel-inc.com
Business Contact:
George Williams
Mr
(971) 223-5646
georgew@voxtel-inc.com
Research Institution:
n/a
Abstract
Synchrotron radiation (SR) has become a widespread tool across a broad spectrum of forefront science. However, with advances in the brightness of synchrotron radiation sources, a wide gap has developed between the ability of these sources to deliver high photon fluxes and the ability of detectors to measure the resulting photon, electron, or ion signals. In a number of cases, expensive beamlines are limited by the lack of suitable fast X-ray imaging systems. This project will develop a radiation-hard, sub-nsec, pixelated, thinned (10 µm), monolithic, Si avalanche photodiode (APD) array as an SR detector for time-resolved photon counting measurements of spatial intensity distributions. In Phase I, prototype back-illuminated APDs of varying thickness and pixel dimension were fabricated using silicon-on-insulator (SOI) silicon wafers engineered for high gain, low dark current, and low excess noise avalanche gain. Using the results of detailed modeling and simulation, the design of the APD array was optimized and used to procure SOI wafers, which were custom engineered with electrically activated dopants. A 100 x 100 mm2 pixel architecture (including low noise amplifier, two-level discriminator, and two user-enabled 16-bit counters) was designed. A fully functional prototype will be fabricated in Phase II. Commercial Applications and Other Benefits as described by the awardee: In addition to synchrotron X-ray science, highly-efficient, back-illuminated APD detectors should have a wide variety of applications in astronomy, fluorescence microscopy, electron microscopy, semiconductor test, soft X-ray spectroscopy, hybrid image intensifier tubes, DNA sequencing, laser radar (LADAR) assisted autonomous navigation, and cruise control.

* information listed above is at the time of submission.

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