TY - JOUR
T1 - Distinction between surface and bulk states in surface-photovoltage spectroscopy
AU - Leibovitch, M.
AU - Kronik, L.
AU - Fefer, E.
AU - Shapira, Yoram
PY - 1994
Y1 - 1994
N2 - The effect of localized electron states on the photovoltage at a free semiconductor surface is analyzed. The analysis shows that surface-photovoltage spectroscopy (SPS) is inherently more sensitive to surface states than to bulk states. Moreover, a fundamental difference between the effect of surface and bulk states on the surface photovoltage (SPV) is shown. The analysis demonstrates that the same illumination-induced variation of the population at a surface and a bulk state may result in a significantly different dependence of the SPV on the illumination intensity. Under certain conditions, this difference makes it possible to distinguish between surface and bulk states by means of SPS. Analytical expressions for these relations are obtained under the depletion approximation, and are compared with the results of a numerical simulation. Experimental results obtained from InP samples demonstrate an application of the theory to practical distinction between surface and bulk states.
AB - The effect of localized electron states on the photovoltage at a free semiconductor surface is analyzed. The analysis shows that surface-photovoltage spectroscopy (SPS) is inherently more sensitive to surface states than to bulk states. Moreover, a fundamental difference between the effect of surface and bulk states on the surface photovoltage (SPV) is shown. The analysis demonstrates that the same illumination-induced variation of the population at a surface and a bulk state may result in a significantly different dependence of the SPV on the illumination intensity. Under certain conditions, this difference makes it possible to distinguish between surface and bulk states by means of SPS. Analytical expressions for these relations are obtained under the depletion approximation, and are compared with the results of a numerical simulation. Experimental results obtained from InP samples demonstrate an application of the theory to practical distinction between surface and bulk states.
UR - http://www.scopus.com/inward/record.url?scp=0000514978&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.50.1739
DO - 10.1103/PhysRevB.50.1739
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AN - SCOPUS:0000514978
SN - 0163-1829
VL - 50
SP - 1739
EP - 1745
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 3
ER -