Direct observation of electrical charges at dislocations in GaAs by cross-sectional scanning tunneling microscopy

Ebert, Ph.; Domke, C.; Urban, K.
January 2001
Applied Physics Letters;1/22/2001, Vol. 78 Issue 4, p480
Academic Journal
We demonstrate the possibility of simultaneous determination of the type and electrical charge state of dislocations in GaAs by cross-sectional scanning tunneling microscopy (STM). The methodology is demonstrated for a dissociated perfect dislocation in highly Si-doped GaAs(110) surfaces. The STM images of the dislocation penetrating GaAs cleavage surface show that both partial dislocation cores as well as the stacking fault between the two partial dislocation cores are negatively charged.


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