Publications

Oxidation of ultrathin GaSe

Beechem, Thomas E.; Kowalski, Brian M.; Brumbach, Michael T.; McDonald, Anthony E.; Spataru, Dan C.; Howell, Stephen W.; Ohta, Taisuke O.; Pask, Jesse A.; Kalugin, Nikolai G.

Oxidation of exfoliated gallium selenide (GaSe) is investigated through Raman, photoluminescence, Auger, and X-ray photoelectron spectroscopies. Photoluminescence and Raman intensity reductions associated with spectral features of GaSe are shown to coincide with the emergence of signatures emanating from the by-products of the oxidation reaction, namely, Ga2Se3 and amorphous Se. Photoinduced oxidation is initiated over a portion of a flake highlighting the potential for laser based patterning of two-dimensional heterostructures via selective oxidation.