TY - JOUR
T1 - Grain-boundary-controlled transport in GaN layers
AU - Shalish, I.
AU - Kronik, L.
AU - Segal, G.
AU - Shapira, Yoram
AU - Zamir, S.
AU - Meyler, B.
AU - Salzman, J.
PY - 2000
Y1 - 2000
N2 - An exponential dependence of the photoconductivity on the surface photovoltage at GaN layers is predicted theoretically and confirmed experimentally. The prediction is based on the assumption that the material is mainly an ordered polycrystal, consisting of columnar grains. Accordingly, transport is expected to be limited by potential barriers at the grain boundaries, arising from the charge trapped at grain-boundary defects. The observed exponential dependence provides evidence that strongly supports the model by establishing a direct link between the bulk conductivity and the surface potential barrier. The same model is shown to successfully explain several other defect-related findings as well.
AB - An exponential dependence of the photoconductivity on the surface photovoltage at GaN layers is predicted theoretically and confirmed experimentally. The prediction is based on the assumption that the material is mainly an ordered polycrystal, consisting of columnar grains. Accordingly, transport is expected to be limited by potential barriers at the grain boundaries, arising from the charge trapped at grain-boundary defects. The observed exponential dependence provides evidence that strongly supports the model by establishing a direct link between the bulk conductivity and the surface potential barrier. The same model is shown to successfully explain several other defect-related findings as well.
UR - http://www.scopus.com/inward/record.url?scp=0000853643&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.61.15573
DO - 10.1103/PhysRevB.61.15573
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AN - SCOPUS:0000853643
SN - 1098-0121
VL - 61
SP - 15573
EP - 15576
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 23
ER -