红外与激光工程, 2005, 34 (1): 31, 网络出版: 2006-05-25   

原生CVDZnSe、CVDZnS晶体内Zn-H络合物含量不同的机理分析

Analysis on mechanism of different Zn-H content in as-grown CVDZnSe and CVDZnS
作者单位
北京有色金属研究总院,北京国晶辉红外光学科技有限公司,北京,100088
摘要
化学气相沉积ZnSe与ZnS晶体结构及物理性能近似,但原生ZnS在6.2μm处存在由ZnH络合物引起的明显的吸收峰,其中的H来源于未分解的含H反应气体,而原生ZnSe则无此现象.比较分析它们的沉积条件(温度、压力)以及反应气性质后认为:ZnSe相对较高的沉积温度和反应气之一的H2Se低的分解温度是主要的原因,同时高温可减弱含H缺陷对ZnS光学性能的影响;其次,ZnSe沉积中压力低使反应物浓度降低且有利于未参与反应的H2Se气体返回主气流减少了ZnSe晶体中Zn-H络合物的含量.
Abstract
CVDZnSe and CVDZnS have similar crystal structure and properties,but absorption peak near 6.2 μm which is brought by the Zn-H is an important difference between as-grown CVDZnSe and CVDZnS. The H comes from the undissociated reaents that contain H.The reason why only ZnS has the absorption peak is discussed by comparing their deposition parameters (temperature, pressure), deposition rate and dissociated temperature of reagents that contain H. Because the dissociate temperature of H2Se is lower than H2S, the higher deposition temperature decreases the Zn-H in ZnSe, at the same time, the influence of Zn-H on ZnS can be decreased by increasing the deposition temperature. Lower deposition pressure of ZnSe is the other reason. Low pressure decreases the reactant concentration, furthermore it favors undissociated H2Se going back to the main airstream.
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付利刚, 霍承松, 鲁泥藕. 原生CVDZnSe、CVDZnS晶体内Zn-H络合物含量不同的机理分析[J]. 红外与激光工程, 2005, 34(1): 31. 付利刚, 霍承松, 鲁泥藕. Analysis on mechanism of different Zn-H content in as-grown CVDZnSe and CVDZnS[J]. Infrared and Laser Engineering, 2005, 34(1): 31.

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