TY - JOUR
T1 - 1/f noise in polycrystalline SiGe analyzed in terms of mobility fluctuations
AU - Chen, X.Y.
AU - Salm, C.
AU - Hooge, F.N.
AU - Woerlee, P.H.
PY - 1999
Y1 - 1999
N2 - Polycrystalline layers of Si0.7Ge0.3 were deposited using low pressure chemical vapor deposition to a thickness of 500 nm on a n-type silicon wafer covered by SiO2. The Si0.7Ge0.3 layers were doped with di¿erent concentrations of boron by ion implantation. The morphology and electrical properties have been characterized using atomic force
microscopy, transmission electron microscopy and Hall e¿ect. Conductance ¯uctuations were measured at room temperature. Decreasing boundary scattering at higher free carrier density results in increased mobility. However, surprisingly enough, we found that the 1/f noise parameter a decreases with increasing mobility, which does not agree with the parameter a measured in crystalline semiconductor material grown by molecular beam epitaxy. The interpretation is that the noise is mainly generated in the depletion region of the grains, but the Hall mobility is reduced by the scattering at grain-boundaries. In this paper we present a detailed analysis to distinguish between 1/f noise from grain-boundaries, depletion region and neutral region of the grains. The 1/f noise in polycrystalline SiGe can well be analyzed in terms of mobility ¯uctuations in lattice scattering.
AB - Polycrystalline layers of Si0.7Ge0.3 were deposited using low pressure chemical vapor deposition to a thickness of 500 nm on a n-type silicon wafer covered by SiO2. The Si0.7Ge0.3 layers were doped with di¿erent concentrations of boron by ion implantation. The morphology and electrical properties have been characterized using atomic force
microscopy, transmission electron microscopy and Hall e¿ect. Conductance ¯uctuations were measured at room temperature. Decreasing boundary scattering at higher free carrier density results in increased mobility. However, surprisingly enough, we found that the 1/f noise parameter a decreases with increasing mobility, which does not agree with the parameter a measured in crystalline semiconductor material grown by molecular beam epitaxy. The interpretation is that the noise is mainly generated in the depletion region of the grains, but the Hall mobility is reduced by the scattering at grain-boundaries. In this paper we present a detailed analysis to distinguish between 1/f noise from grain-boundaries, depletion region and neutral region of the grains. The 1/f noise in polycrystalline SiGe can well be analyzed in terms of mobility ¯uctuations in lattice scattering.
U2 - 10.1016/S0038-1101(99)00136-7
DO - 10.1016/S0038-1101(99)00136-7
M3 - Article
VL - 43
SP - 1715
EP - 1724
JO - Solid-State Electronics
JF - Solid-State Electronics
SN - 0038-1101
ER -