Scanning tunneling microscope with gallium arsenide microtip fabricated by selective epitaxial growth

Abstract

GaAs microtip for scanning tunneling microscope was fabricated by selective metalorganic chemical vapor deposition. The GaAs tip was constructed by two {111}B growth facets and a cleaved (110) surface. The surface of the GaAs tip was treated by ammonium sulfide solution, and highly oriented pyrolytic graphite surfaces were observed by using the GaAs tip in air. As the result, imagings of the atomic arrangement could be successfully obtained.