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- W2026863114 abstract "A characterization method is presented, which determines fixed charge and interface defect densities in passivation layers. This method bases on a bias voltage applied to an electrode on top of the passivation layer. During a voltage sweep, the effective carrier lifetime is measured by means of microwave detected photoconductivity. When the external voltage compensates the electric field of the fixed charges, the lifetime drops to a minimum value. This minimum value correlates to the flat band voltage determined in reference impedance measurements. This correlation is measured on p-type silicon passivated by Al2O3 and Al2O3/HfO2 stacks with different fixed charge densities and layer thicknesses. Negative fixed charges with densities of 3.8 × 1012 cm−2 and 0.7 × 1012 cm−2 are determined for Al2O3 layers without and with an ultra-thin HfO2 interface, respectively. The voltage and illumination dependencies of the effective carrier lifetime are simulated with Shockley Read Hall surface recombination at continuous defects with parabolic capture cross section distributions for electrons and holes. The best match with the measured data is achieved with a very low interface defect density of 1 × 1010 eV−1 cm−2 for the Al2O3 sample with HfO2 interface." @default.
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- W2026863114 date "2015-02-09" @default.
- W2026863114 modified "2023-09-26" @default.
- W2026863114 title "BiasMDP: Carrier lifetime characterization technique with applied bias voltage" @default.
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- W2026863114 doi "https://doi.org/10.1063/1.4907886" @default.
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