ZnSe:Te박막의 제작과 광학적 특성에 관한 연구
A study on Fabrication of ZnSe:Te THIN AND Their Optical Properties
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Abstract
In this study, systematical investigations were carried out on crystal qualities and optical properties of ZnSe1-x:Tex (x=0.002-0.04) thin films grown by molecular beam epitaxy (MBE). The crystal qualities and optical properties have been investigated by X-ray diffraction (XRD) and photoluminescence (PL) measurements, respectively. From the XRD measurements, the crystallographic characteristics showed mediocre crystal quality with increasing the Te composition. From the PL measurements, emission in the visible spectrum region from blue to green was obtained by varying the Te content of the ZnSe:Te epilayers. The efficient blue and green emission were attributed to the recombination of excitons trapped at isoelectronic isolated a single Te atom and Ten (n≥2) clusters, respectively. The blue emission become dominant in Te lightly doped ZnSe1-x:Tex (Te=0.2%) epilayers with increasing temperature. For the Te heavily doping condition (Te=4.0%), the dominant green emission could be observed at around 160K.
참고문헌 (7)
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