TY - JOUR
T1 - Persistent light-induced change in the effective band gap and reversible control over the effective band gap in bulk semiconductor crystals
AU - Shwartz, Sharon
AU - Adarsh, K. V.
AU - Segev, Mordechai
AU - Lakin, Evgeny
AU - Zolotoyabko, Emil
AU - El-Hanany, Uri
PY - 2011/6/16
Y1 - 2011/6/16
N2 - We demonstrate that the effective optical band gap of bulk semiconductor CdZnTe:V crystals can be varied and controlled by dual application of light and electric field, both at moderate strengths. When the combined effect of light intensity and applied field exceeds a threshold, the effective band-gap shift persists even after the light is turned off, as long as the electric field is applied. The persistent effective band-gap shift is accompanied by persistent photocurrent and persistent change in the (220) d spacing of crystalline lattice. However, all persistence effects can be reset to their original values when the applied field is turned off.
AB - We demonstrate that the effective optical band gap of bulk semiconductor CdZnTe:V crystals can be varied and controlled by dual application of light and electric field, both at moderate strengths. When the combined effect of light intensity and applied field exceeds a threshold, the effective band-gap shift persists even after the light is turned off, as long as the electric field is applied. The persistent effective band-gap shift is accompanied by persistent photocurrent and persistent change in the (220) d spacing of crystalline lattice. However, all persistence effects can be reset to their original values when the applied field is turned off.
UR - http://www.scopus.com/inward/record.url?scp=79961230576&partnerID=8YFLogxK
U2 - 10.1103/physrevb.83.241201
DO - 10.1103/physrevb.83.241201
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AN - SCOPUS:79961230576
SN - 1098-0121
VL - 83
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 24
M1 - 241201
ER -