NDLI: Potential barrier of mica-metal contact

Content Provider	IEEE Xplore Digital Library
Author	Sakakibara, T. Aeba, N. Endo, M.
Copyright Year	1989
Description	Author affiliation: Fac. of Sci. & Eng., Chuo Univ., Tokyo, Japan (Sakakibara, T.; Aeba, N.)
Abstract	To study the relationship between the composition of the dielectric surface and the potential barrier, photocurrent spectra were measured for cleared mica (muscovite) which could be expected theoretically not to have any free chemical bonds at its surface. Barrier heights and densities of surface states were examined for specimens whose surfaces were irradiated by a neutral Ar beam to remove contamination and adsorbed gas or to modify their composition. It was found that the barrier height of a mica-metal contact was not altered by a short period of irradiation with the Ar beam or by exposure to the air after irradiation. A long period of irradiation (40 min) resulted in damage to the mica surface, and the density of surface states increased up to about 3 times (1.2*10/sup 14/ states cm/sup -2/ eV/sup -1/) that of the untreated specimen. It was found by ESCA (electron spectroscopy for chemical analysis) that potassium and sodium atoms were sputtered by the long period of irradiation, causing imperfections or disordering in the surface structure of the mica. The surface states created by the irradiation are believed to be dependent on the free bonds that formed as a result of the above imperfections.<>
Starting Page	30
Ending Page	34
File Size	241679
Page Count	5
File Format	PDF
DOI	10.1109/ICSD.1989.69156
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-07-03
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Surface treatment Argon Gold Surface cleaning Surface contamination Dielectrics Photoconductivity Pollution measurement Electrodes
Content Type	Text
Resource Type	Article

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