异质结
材料科学
晶体生长
光电子学
化学
化学工程
结晶学
纳米技术
工程类
作者
Hao Yuan,T. Tiedje,Jingye Chen,Hui Wang,Brad Aitchison,Pawan Kumar,Yuxin Song
摘要
Polished Cd0.9Zn0.1Te (CZT) single crystals have been exposed to dilute H2S in nitrogen at temperatures from 200 to 280 °C in order to produce a sulfide layer on the surface. The composition of the CZT surfaces before and after H2S exposure has been investigated by photoemission, x-ray absorption, cross-sectional SEM, and spectroscopic ellipsometry. At the highest temperature, H2S exposure removes surface oxides and depletes Te, leaving a CdS surface layer. CdS layers 60 nm thick have been grown with a 2 h exposure to H2S at 280 °C. Surfaces that are initially oxidized through ozone exposure are much more reactive with H2S than unintentionally oxidized surfaces.
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