TY - GEN
T1 - Study of depth-dependent radiation-induced defects using coherent acoustic phonon spectroscopy
AU - Steigerwald, A.
AU - Gregory, J.
AU - Varga, K.
AU - Hmelo, A. B.
AU - Liu, X.
AU - Furdyna, J. K.
AU - Feldman, L. C.
AU - Tolk, N.
PY - 2011/12/1
Y1 - 2011/12/1
N2 - Here we study the effect of radiation-induced point defect distributions on the optical reflectivity signal in GaAs using coherent acoustic phonon spectroscopy. We demonstrate that the presence of point defects significantly modifies the optical response, allowing estimation of the depth-dependent defect distribution in a nondestructive and noninvasive manner. We show that the observed changes are dependent on defect-induced changes to the electronic structure, namely defect-induced band tailing of the direct 1.43eV band edge. This provides a method for subsurface investigations on the complex interaction between different defects species and optoelectronic structure.
AB - Here we study the effect of radiation-induced point defect distributions on the optical reflectivity signal in GaAs using coherent acoustic phonon spectroscopy. We demonstrate that the presence of point defects significantly modifies the optical response, allowing estimation of the depth-dependent defect distribution in a nondestructive and noninvasive manner. We show that the observed changes are dependent on defect-induced changes to the electronic structure, namely defect-induced band tailing of the direct 1.43eV band edge. This provides a method for subsurface investigations on the complex interaction between different defects species and optoelectronic structure.
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U2 - 10.1557/opl.2011.1427
DO - 10.1557/opl.2011.1427
M3 - Conference contribution
AN - SCOPUS:84860147818
SN - 9781618395634
T3 - Materials Research Society Symposium Proceedings
SP - 67
EP - 73
BT - Fundamental Science of Defects and Microstructure in Advanced Materials for Energy
T2 - 2011 MRS Spring Meeting
Y2 - 25 April 2011 through 29 April 2011
ER -