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Carrier distribution in quantum nanostructures by scanning capacitance microscopy

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9 Author(s)
Giannazzo, F. ; CNR-IMM, sezione di Catania, Stradale Primosole 50, 95121 Catania, Italy ; Raineri, V. ; La Magna, A. ; Mirabella, S.
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Scanning capacitance microscopy (SCM) was carried out in the angle beveling configuration on B doped, very narrow quantum wells (QWs) of Si0.75Ge0.25 layers strained between Si films. The majority carrier concentration profiles were calculated from the SCM raw data measured on QWs with a minimum width of 5 nm, doped with different B concentrations ranging from 2×1016 to 6×1018 cm-3. The equilibrium carrier distribution in the heterostructures has been calculated by different simulation approaches, which will be discussed. Moreover, the effect of the biased tip-sample interaction was studied by accurate simulations of the dC/dV vs V characteristics for different positions of the tip moving on the beveled sample surface. The agreement between the experimental and simulated SCM profiles is very good. Thus, a spatial SCM resolution of at least 5 nm was demonstrated on angle beveled samples, not only in terms of signal sensitivity, but also in terms of quantitative majority carrier profiling.

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Journal of Applied Physics  (Volume:97 ,  Issue: 1 )