skip to main content

SciTech ConnectSciTech Connect

Title: Purification of CdZnTe by electromigration

Electro-migration of ionized/electrically active impurities in CdZnTe (CZT) was successfully demonstrated at elevated temperature with an electric field of 20 V/mm. Copper, which exists in positively charged states, electro-migrated at a speed of 15 μm/h in an electric field of 20 V/mm. A notable variation in impurity concentration along the growth direction with the segregation tendency of the impurities was observed in an electro-migrated CZT boule. Notably, both Ga and Fe, which exist in positively charged states, exhibited the opposite distribution to that of their segregation tendency in Cd(Zn)Te. A CZT detector fabricated from the middle portion of the electro-migrated CZT boule showed an improved mobility-lifetime product of 0.91 × 10{sup −2} cm{sup 2}/V, compared with that of 1.4 × 10{sup −3} cm{sup 2}/V, observed in an as-grown (non-electro-migrated) CZT detector. The optimum radiation detector material would have minimum concentration of deep traps required for compensation.
Authors:
 [1] ; ;  [2] ; ;  [3] ; ; ;  [4]
  1. Department of Radiologic Science, Korea University, Seoul 136-713 (Korea, Republic of)
  2. Department of Applied Physics, Korea University, Sejong 339-700 (Korea, Republic of)
  3. AbyzR Corporation, Gyeonggi-do 445-811 (Korea, Republic of)
  4. Brookhaven National Laboratory, Upton, New York 11973 (United States)
Publication Date:
OSTI Identifier:
22402854
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CADMIUM COMPOUNDS; CARRIER LIFETIME; CARRIER MOBILITY; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; COPPER; ELECTRIC FIELDS; ELECTROPHORESIS; IMPURITIES; PURIFICATION; RADIATION DETECTORS; SEGREGATION; TRAPS; ZINC TELLURIDES