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Stress-induced local trap levels in Au/n-GaAs Schottky diodes with embedded InAs quantum dots

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7 Author(s)
Tsormpatzoglou, A. ; Dept. of Phys., Univ. of Thessaloniki, Greece ; Tassis, D.H. ; Dimitriadis, C.A. ; Frigeri, P.
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Local trap levels in Au/n-GaAs Schottky diodes with embedded InAs quantum dots, generated after a long time of the device operation, have been investigated with low-frequency noise measurements performed in the temperature range of 77-298 K and at the forward current of 30 nA. Whereas the initial devices show a pure 1/f noise behavior, after a long time of operation, recombination noise was observed at frequencies above 100 Hz, in addition to the 1/f noise at lower frequencies. Analysis of the recombination noise data obtained on structures where different GaAs cap layer thicknesses have been removed by etching allowed us to determine the activation energy of the local traps and have a rough estimation of their spatial distribution.

Published in:

Electron Device Letters, IEEE  (Volume:27 ,  Issue: 5 )

Date of Publication:

May 2006

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