The depth of depletion layer and the height of energy barrier on ZnO under hydrogen

被引:16
作者
Han, CS [1 ]
Jun, J
Kim, H
机构
[1] Chonnam Natl Univ, Dept Chem, Kwangju 500757, South Korea
[2] Dongshin Univ, Dept Environm Engn, Naju 520714, Chonnam, South Korea
关键词
surface double layers; schottky barriers; work function; ZnO; chemisorption;
D O I
10.1016/S0169-4332(01)00118-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The depth of depletion layer and height of energy barrier on ZnO non-polar surface were measured under hydrogen from the electrical properties of ZnO-ZnO contact. In capacitance measurement, it was observed that the depth of the depletion layer increased reversibly at 298 and 373 K, while it decreased irreversibly at 473 and 573 K. The increments of the depth at 298 and 373 K were nearly fitted to Freundlich isotherm, and it was suggested that donor type adsorbed states were in thermal equilibrium with other species. The height of the energy barrier on the surface from the inflection of V-I characteristics increased under hydrogen at 298 K. Typical values of the two measurements at 67 Pa hydrogen and 298 K were 40 nm (corresponding to 2.2 x 10(14) anion states m(-2)) for the depth and 5 meV for the height. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:567 / 573
页数:7
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