Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..mar.l7003h&link_type=abstract
American Physical Society, March Meeting 2004, March 22-26, 2004, Palais des Congres de Montreal, Montreal, Quebec, Canada, MEET
Physics
Scientific paper
Transport of photo-generated charge plays a key role in the operation of photon detectors across the full range of the electromagnetic spectrum. While it is often necessary to determine transport parameters from device-scale transport measurements, this approach can obscure highly localized non-uniformities associated with boundary conditions, carrier injection and contact variations. This is apparent in the complex transient behavior of even the simplest of devices, such as the far infrared photoconductors recently launched on the Space Infrared Telescope Facility (SIRTF). Work at Fairfield University in recent years has focused on the modeling of transient phenomena unique to the low temperature, low electric field and low photon flux regime that characterizes far IR detectors. Results will also be presented from a special technique, using a scanning electron microscope, to directly image the motion and injection of charge, particularly in the near-contact region. Examples of transport imaging, as well as a description of progress in the modeling and optimization of far infrared detectors, will be used to highlight these less commonly explored regions of space-charge dominated transport behavior.
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