Pavir šiaus pasyvacijos įtakos pavieni ų GaAs nanovam zdeli ų elektrinėms savyb ėms tyrimas matuojant srov ės priklausomybę nue įtampos atominės mikroskopu. / Geydt, P.; Alekseev, P. A.; Dunaevskiy, M. S. et al.
In: Lithuanian Journal of Physics, Vol. 56, No. 2, 3, 2016, p. 92-101.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Pavir šiaus pasyvacijos įtakos pavieni ų GaAs nanovam zdeli ų elektrinėms savyb ėms tyrimas matuojant srov ės priklausomybę nue įtampos atominės mikroskopu
AU - Geydt, P.
AU - Alekseev, P. A.
AU - Dunaevskiy, M. S.
AU - Haggrén, T.
AU - Kakko, J. P.
AU - Lähderanta, E.
AU - Lipsanen, H.
N1 - Publisher Copyright: © Lietuvos mokslų akademija, 2016.
PY - 2016
Y1 - 2016
N2 - Current–voltage (I–V) characteristics of vertical p-GaAs nanowires (NWs) covered by different surface passivation materials were experimentally measured by conductive atomic force microscopy (C-AFM). The obtained I–V curves for individual NWs with a diameter of 100 nm covered with AlGaAs, GaN, GaP or InP shell layers were compared to analyse the influence of surface passivation on the density of surface states and choose the most beneficial passivating material for technological applications. We have found the absence of a Schottky barrier between the golden catalytic cap on the top of a NW and the nanowire situated below and covered with an ultrathin GaP passivating layer. It was suggested that passivating material can arrange the heterostructure configuration with the GaAs NW near the Au cap. The latter mechanism was proposed to explain a strong energy barrier found in nanowires covered with InP passivation. AlGaAs passivation affected the forward threshold voltage of nanowires for NWs, which was measured simultaneously with the resistivity of each individual vertical structure from an array by means of AFM in the regime of measuring the I–V curves and onefold calculations. We made an attempt to develop the methodology of measurement and characterization of electric properties of passivated NWs.
AB - Current–voltage (I–V) characteristics of vertical p-GaAs nanowires (NWs) covered by different surface passivation materials were experimentally measured by conductive atomic force microscopy (C-AFM). The obtained I–V curves for individual NWs with a diameter of 100 nm covered with AlGaAs, GaN, GaP or InP shell layers were compared to analyse the influence of surface passivation on the density of surface states and choose the most beneficial passivating material for technological applications. We have found the absence of a Schottky barrier between the golden catalytic cap on the top of a NW and the nanowire situated below and covered with an ultrathin GaP passivating layer. It was suggested that passivating material can arrange the heterostructure configuration with the GaAs NW near the Au cap. The latter mechanism was proposed to explain a strong energy barrier found in nanowires covered with InP passivation. AlGaAs passivation affected the forward threshold voltage of nanowires for NWs, which was measured simultaneously with the resistivity of each individual vertical structure from an array by means of AFM in the regime of measuring the I–V curves and onefold calculations. We made an attempt to develop the methodology of measurement and characterization of electric properties of passivated NWs.
KW - AFM
KW - Current–voltage characteristics
KW - GaAs
KW - Nanowires
KW - Passivation
UR - http://www.scopus.com/inward/record.url?scp=84979891844&partnerID=8YFLogxK
UR - https://elibrary.ru/item.asp?id=27108093
U2 - 10.3952/physics.v56i2.3305
DO - 10.3952/physics.v56i2.3305
M3 - статья
AN - SCOPUS:84979891844
VL - 56
SP - 92
EP - 101
JO - Lithuanian Journal of Physics
JF - Lithuanian Journal of Physics
SN - 1648-8504
IS - 2
M1 - 3
ER -
ID: 35375333