The sidewall passivation of GaAs in atmospheres containing the chain-buildi
ng molecule BCl3 has been investigated employing Auger electron spectroscop
y and time-of-flight secondary ion mass spectrometry. It could be proven th
at the film that protects the sidewalls from further chemical attack is com
posed mainly of (B2Cl4)(proportional to) rather than polymers of B2O3. (C)
2001 American Vacuum Society.