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首页> 外文会议>Progress in functional materials >Determination of transition mechanism and polarity of a c-plane ZnO bulk by using contactless electroreflectance spectrum
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Determination of transition mechanism and polarity of a c-plane ZnO bulk by using contactless electroreflectance spectrum

机译：用非接触电反射光谱确定c面ZnO块的跃迁机理和极性

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摘要

Contactless electroreflectance (CER) spectra of Zn and O-polarity faces of a c-plane ZnO bulk were measured at room temperature. Besides a depletion electric field existing in the sample, it is known that there is a polarization electric field due to nonzero spontaneous polarization. In this work, a mercury lamp was focused on the ZnO sample in the CER measurements to provide a photo-biased voltage to reduce strength of electric field of the sample. It was found that the spectrum with Hg lamp being on is more blue-shifted and its amplitude is smaller than that without Hg lamp. Thus the type of transition was attributed to excitonic transition. The shift of the excitonic transition-energies of the Zn- and O-faces were obtained by fitting experimental CER spectra by using Lorenzian line-shapes. In addition, the polarity of faces can be determined by the amount of shift with Hg lamp being on.
机译：在室温下测量c平面ZnO块体的Zn和O极性面的非接触电反射（CER）光谱。已知除了样品中存在耗尽电场外，还存在由于非零自发极化引起的极化电场。在这项工作中，在CER测量中将汞灯聚焦在ZnO样品上，以提供光偏置电压，以降低样品的电场强度。结果发现，与不使用汞灯的情况相比，打开汞灯的光谱的蓝移更大，幅度更小。因此，过渡类型归因于激子过渡。通过使用洛伦兹线形拟合实验CER光谱获得Zn和O面的激子跃迁能的位移。此外，可以通过打开Hg灯时的偏移量来确定面部的极性。

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