TY - GEN
T1 - New insights for uniform and large-volume CdZnTe and CdMnTe detectors
AU - Kim, K. H.
AU - Bolotnikov, A. E.
AU - Camarda, G. S.
AU - Tappero, R.
AU - Cui, Y.
AU - Hossain, A.
AU - Franc, J.
AU - Marchini, L.
AU - Zappettini, A.
AU - Fochuk, P.
AU - Gul, R.
AU - Yang, G.
AU - James, R. B.
PY - 2011
Y1 - 2011
N2 - CdZnTe (CZT) and CdMnTe (CMT) materials come into the spotlight for room-temperature semiconductor detectors. Nonethelss, both materials still have limitations for the production of economical, uniform, and large-volume devices due to the zinc (Zn) segregation in CZT and manganese purity in CMT. The effective segregation coefficient of Zn in the CdTe host is nearly 1.3, so about 5-6% of Zn deviation has been reported in Bridgman-grown CZT (Zn=10%) ingots. Such Zn non-uniformity limits the cutting of the ingot parallel to the crystal growth direction for producing large-volume CZT detectors due to the signal non-uniformity that would be generated by the band-gap variations. However, our recent findings show that the Zn segregation can be controlled by the specific thermal environment. The high residual impurities in the starting source materials, especially for manganese, were obstacles for obtaining high-performance CMT detectors. The purification of manganese telluride (MnTe) by a floating Te melt-zone proved to be very effective, and CMT detectors fabricated with purified material give a 2.1% energy resolution for 662 keV associated with a 137Cs gamma source.
AB - CdZnTe (CZT) and CdMnTe (CMT) materials come into the spotlight for room-temperature semiconductor detectors. Nonethelss, both materials still have limitations for the production of economical, uniform, and large-volume devices due to the zinc (Zn) segregation in CZT and manganese purity in CMT. The effective segregation coefficient of Zn in the CdTe host is nearly 1.3, so about 5-6% of Zn deviation has been reported in Bridgman-grown CZT (Zn=10%) ingots. Such Zn non-uniformity limits the cutting of the ingot parallel to the crystal growth direction for producing large-volume CZT detectors due to the signal non-uniformity that would be generated by the band-gap variations. However, our recent findings show that the Zn segregation can be controlled by the specific thermal environment. The high residual impurities in the starting source materials, especially for manganese, were obstacles for obtaining high-performance CMT detectors. The purification of manganese telluride (MnTe) by a floating Te melt-zone proved to be very effective, and CMT detectors fabricated with purified material give a 2.1% energy resolution for 662 keV associated with a 137Cs gamma source.
UR - http://www.scopus.com/inward/record.url?scp=84863372759&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863372759&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2011.6154708
DO - 10.1109/NSSMIC.2011.6154708
M3 - Conference contribution
AN - SCOPUS:84863372759
SN - 9781467301183
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 4751
EP - 4755
BT - 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
Y2 - 23 October 2011 through 29 October 2011
ER -