1[1]PANDOVE J I,S CHADE H P.GaN Neative electron affinity photocathodes[J].Appl.phys Lett 1974,(25):53-56.
2[2]EYCKELER M,W.MONCH.Negative electron affinity of cesiated P-GaN (0001) Surfaces[J].J.Vac.Sci.Technol,1998,B16(4):2224～2230.
3[3]ZHANG HAO XIANG,YE ZHI ZHEN,ZHAO BING HUI.Investigation of preparation and properties of epitaxial grouth GaN film on si(111)substrate[J].Journal of Crystal Grouth,2000,(210):511～515.
