Photoelectron diffraction study on the polarity of GaN surface

We have obtained the photoelectron diffraction curves from (1010) and (1120) crystal planes on GaN(0001) surface by using a polar scan mode of x-ray photoelectron diffraction (XPD). On the basis of principle of “forward focusing" of XPD, we have determined that its polarity is Ga termination. The polarity of GaN(0001) surface is also studied by using energy dependence photoelectron diffraction called angle-resolved photoemission extended fine structure, as well as the calculation of multiple scattering cluster models, which confirmed that its polarity is Ga termination.