Ultraviolet photoelectron spectroscopy and photoconductivity of CaF2

被引：8

作者：

Huisinga, M ^{[1
]}

Reichling, M ^{[1
]}

Matthias, E ^{[1
]}

机构：

[1] FREE UNIV BERLIN,FACHBEREICH PHYS,D-14195 BERLIN,GERMANY

来源：

PHYSICAL REVIEW B | 1997年 / 55卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.55.7600

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Vacuum ultraviolet photoelectron spectroscopy and a systematic study of charging during irradiation with 21.2-eV photons was carried out on cleaved (111) surfaces of CaF2 crystals. The goal was twofold: (1) to find ways of suppressing charging effects and (2) to use surface charging for monitoring photoconductivity. Attempts to reduce charging included crystal heating, use of negatively charged grids at the rear of the sample, and flooding with low-energy electrons. At crystal temperatures between 220 and 350 degrees C both the negative grid and the flood-gun technique produce charge-free surfaces. The enhanced photoconductivity during UV irradiation is explained by thermally activated diffusion of V-k centers. The observed temperature dependence yields an activation energy of 0.30+/-0.06 eV.

引用

页码：7600 / 7605

页数：6

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