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- W1990790410 abstract "Abstract The electrolyte electroreflectance (HER) spectra of GaAs crystals, both undoped, highly compensated (NA ≈ ND = 3 × 1015 cm−3 and n-type (Nd = 1017cm−3), were studied as a function of the applied bias in the photon energy range corresponding to EE0 + Δ0 transitions. Unequivocal experimental evidence was obtained for the first time that the low-field limit of Aspnes third-derivative model applies to sufficiently low doped GaAs samples, as is the case for our undoped crystal. In this case, a reliable measurement of the flat-band potential (Vfb) could be obtained by means of HER voltammetries. The behaviour of the n-type sample was found to be different in two main aspects: first, low field conditions could not be fitted; second, Vfb appeared shifted by about 2.0 V towards negative values because of a strong Fermi-level pinning effect associated with the surface electro-reduction of the electrode. These Vfb shifts, which are associated with the n-type character, prevent any reliable Vfb measurement, even if the concentration of free carriers is sufficiently low and low-field conditions are fulfilled." @default.
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- W1990790410 date "1991-04-01" @default.
- W1990790410 modified "2023-09-27" @default.
- W1990790410 title "GaAs electrolyte electroreflectance: low-field spectra and flat-band potential shift measurements" @default.
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- W1990790410 doi "https://doi.org/10.1016/0039-6028(91)90034-p" @default.
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