Improved CZT Detectors by Unique Surface Treatments and Innovative Contacts

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-07ER84736
Agency Tracking Number: 82530
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: 42
Solicitation Number: DE-PS02-06ER06-30
Small Business Information
Eic Laboratories, Inc.
111 Downey Street, Norwood, MA, 02062
DUNS: 076603836
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Krishna Mandal
 Dr
 (781) 769-9450
 kmandal@eiclabs.com
Business Contact
 Jeffrey Bursell
Title: Mr
Phone: (781) 769-9450
Email: jefbursell@eiclabs.com
Research Institution
N/A
Abstract
CZT (Cd0.9Zn0.1Te) gamma radiation detectors are presently the best candidates for room temperature operation, in order to identify radiological isotopes in materials for military, medical, and commercial applications. Presently, the typical energy resolution of CZT detectors is on the order of 2%, rather than the desired =5%. To achieve this energy resolution goal, this project will employ novel contact fabrication techniques, unique post growth treatment, and surface modifications. The approach involves three innovative pathways to improve the resolution of CZT radiation detectors: (1) implementation of high-barrier Schottky contacts to reduce the dark leakage current to an acceptable level; (2) post growth annealing treatments to eliminate precipitates and inclusions, which trap the electrons and limit the signals observed in the external circuitry; and (3) surface passivation by unique surface modifying treatments to reduce interfacial state densities to reduce leakage current. Commercial Applications and other Benefits as described by the awardee: The improved CZT based radiation detectors should be cost-effective and highly efficient, and should offer substantial performance advantages over existing gamma ray detectors. The CZT detector should be suitable for remote portable field applications including nuclear non-proliferation, national security, medical diagnostic imaging, environmental monitoring, and industrial inspection.

* information listed above is at the time of submission.

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