Determination of polarity of ZnO single crystal by contactless electroreflectance and photoreflectance
Directions of polarization fields are different on Zn-face and O-face of c-plane Zn0 wurtzite single crystal due to the influence of the spontaneous polarization.Photoreflectance(PR)and contactless electroreflectance(CER)spectra have been used to determine the polarity of c-plane GaN films.In this work we determined the internal field directions of both faces of the 0.5mm thick Zn0 single crystal by comparing phases of its PR and CER spectra.Its carrier concentration is in the range of 106 cm-3.It was found that the PR and CER spectrum of the Zn-face has inversion phase line-shape,which means its internal field is directed outward.However,O-face has the same phase line-shape,which means its internal field is directed inward.This is consistent with the direction of polarization,which is dominant in the surface region in this range of carrier concentration.Hence,the polarity of c-plane Zn0 crystal can be determined by comparing phases of its PR and CER spectra.
polarity photoreflectance contactless electroreflectance
WANG Dong-Po
Department of Physics,National Sun Yat-Sen University
国际会议
The 33th Chinese Control Conference第33届中国控制会议
南京
英文
5921-5923
2014-07-28（万方平台首次上网日期，不代表论文的发表时间）