MEASURING METHOD FOR OPTICAL BAND GAP OF HYDROCARBON FILM USING LOW ENERGY ELECTRON SPECTROSCOPY

摘要

PURPOSE: To measure the optical band gap of an unknown sample by calculating the threshold value of the exciting energy of the unknown sample by preliminarily calculating the correlation between the threshold value of the photoelectron discharge exciting energy of a standard sample and an optical band gap. ;CONSTITUTION: The light emitted from an ultraviolet lamp 1 is spectrally diffracted by a monochrometer 2 to be applied to the surface 7 of a sample. When this light is scanned from high exciting energy to low exciting energy, electron discharge due to photoelectric effect is started by predetermined energty (eV). After a discharged photoelectron is counted by a low energy electron measuring device 3, the relation between a photoelectron discharge ratio and exciting energy is calculated. The correlation between the threshold value of photoelectron energy measured by low energy spectroscopy and the optical band gap calculated by a tow plot is calculated with respect to a hydrocarbon film of every kind. Next, the threshold value of photoelectron discharge exciting energy is observed with respect to the hydrocarbon film of an unknown sample. The optical band gap of the unknown sample can be known from the correlation calculated with respect to a standard sample.;COPYRIGHT: (C)1993,JPO&Japio