TY - JOUR
T1 - Study of material uniformity in high-resistivity Cd1−xZnxTe and Cd1−xMnxTe crystals
AU - Brovko, Artem
AU - Ruzin, Arie
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - In the last decade Cd1−xMnxTe (CMT) has been considered as a very promising material for room-temperature radiation detectors. Manganese has a better segregation compared to that of zinc in Cd1−xZnxTe (CZT), in addition MnTe has a wider bandgap than ZnTe enabling broader band “tunability” in the ternary alloy. In this work, we provided a general comparison of these materials grown in similar conditions, focusing, on material composition uniformity and electric properties under dark conditions. Results of material uniformity analyses clearly confirm better homogeneity of CMT crystals, both laterally and in-depth. In addition to material studies, the current–voltage (I–V) characteristics of both In/CZT/In and In/CMT/In metal–semiconductor–metal (MSM) structures were characterized. The results revealed significantly lower variations in contact-to-contact currents in CMT compared to that in CZT (10% and 25% variance, respectively). The temperature behavior of I–V in In/CZT/In and In/CMT/In devices was investigated with calculation of dark current activation energy. The activation energies of dark current mechanisms in CMT were found to be similar at both polarities, whereas there was a 0.2 eV polarity-related difference in CZT based structures.
AB - In the last decade Cd1−xMnxTe (CMT) has been considered as a very promising material for room-temperature radiation detectors. Manganese has a better segregation compared to that of zinc in Cd1−xZnxTe (CZT), in addition MnTe has a wider bandgap than ZnTe enabling broader band “tunability” in the ternary alloy. In this work, we provided a general comparison of these materials grown in similar conditions, focusing, on material composition uniformity and electric properties under dark conditions. Results of material uniformity analyses clearly confirm better homogeneity of CMT crystals, both laterally and in-depth. In addition to material studies, the current–voltage (I–V) characteristics of both In/CZT/In and In/CMT/In metal–semiconductor–metal (MSM) structures were characterized. The results revealed significantly lower variations in contact-to-contact currents in CMT compared to that in CZT (10% and 25% variance, respectively). The temperature behavior of I–V in In/CZT/In and In/CMT/In devices was investigated with calculation of dark current activation energy. The activation energies of dark current mechanisms in CMT were found to be similar at both polarities, whereas there was a 0.2 eV polarity-related difference in CZT based structures.
KW - CdMnTe
KW - CdZnTe
KW - ESEM
KW - I–V
KW - XRD
UR - http://www.scopus.com/inward/record.url?scp=85063218799&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2019.03.051
DO - 10.1016/j.nima.2019.03.051
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AN - SCOPUS:85063218799
SN - 0168-9002
VL - 958
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
M1 - 161996
ER -