Time-resolved OBIC for probing current filamentation in GaAs/AlxGa1-xAs heterostructures

J.E.M. Haverkort, P. Hendriks, E.A.E. Zwaal, J.H. Wolter

Research output: Contribution to journalArticleAcademicpeer-review


We developed a time-resolved optical beam induced current (TROBIC) technique to image current filamentation in a GaAs/AlxGa1-xAs heterostructures under high electric field conditions. The TROBIC method combines a laserscan microscope in the OBIC-mode with a sampling oscilloscope to time-resolve the OBIC signal and allowing to operate under high electric field conditions. We attribute the current patterns observed in the TROBIC images to the formation of current filaments in the AlxGa1-xAs layer, parallel to the two-dimensional electron gas (2DEG). We show that even in samples where the two-dimensional electron gas and the contacts to the 2DEG are perfectly ohmic and homogeneous, current filaments can still develop at high electric fields.

Original languageEnglish
Pages (from-to)203-209
Number of pages7
JournalMicroelectronic Engineering
Issue number1-4
Publication statusPublished - Mar 1994


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