摘要
The influence of oxygen partial pressure on the Fermi level of ZnO films prepared by pulsed laser deposition is investigated.The contact potential difference of the ZnO films fabricated under various oxygen partial pressures is studied systematically using Kelvin probe force microscopy.The Fermi level shifted by 0.35 eV as oxygen partial pressure increased.This indicates a significant change in the electronic structure and energy balance in ZnO films.This fact provides a consistent explanation that the changes in carrier concentration,resistivity and mobility of ZnO films are attributed to oxygen vacancy induced shift of the Fermi level.
作者
SU Ting
ZHANG Hai-Feng
苏婷;张海丰(Department of Mechanical Engineering,National University of Singapore,9 Engineering Drive 1,Singapore 117576;Department of Physics,Jiamusi University,Jiamusi 154007)