On the formation mechanism of γ-AgI thin films
On the formation mechanism of γ-AgI thin films
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DOI：
10.1016/s0040-6090(99)00647-1
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发表时间：
1999-12-15
期刊：
影响因子：
2.1
通讯作者：
Sunandana, CS
中科院分区：
文献类型：
--
作者：
Kumar, PS;Dayal, PB;Sunandana, CS
在常温常压下对银箔进行程序化碘化处理，可形成具有锌-银结构的γ-AgI薄膜。重力实验表明，碘化银膜的形成遵循抛物线的时间依赖性。未退火，退火和蚀刻的银箔上的膜形成的X射线衍射监测表明，本征堆垛层错的情况下是形成γ-碘化银薄膜的必要条件，并且这种故障的存在总是导致β-碘化银薄膜的形成。光吸收研究表明，随着碘化时间的增加，直接光学带隙最终饱和，这证实了X射线衍射和重量分析结果。(C)1999年Elsevier Science S.A. All rights reserved.
Programmed iodization of silver foils at ambient temperature and pressure leads to the formation of gamma-AgI films with zinc-blende structure. Gravimetric experiments show that the AgI film formation follows a parabolic time dependence. X-ray diffraction monitoring of the film formation on unannealed, annealed and etched silver foils reveals that the absence of intrinsic stacking faults is a necessary condition for the formation of gamma-AgI thin films and that the presence of such faults invariably results in the formation of beta-AgI thin films. Optical absorption studies indicate eventual saturation of the direct optical band gap with increase in iodination time, which corroborates Xray diffraction and gravimetry results. (C) 1999 Elsevier Science S.A. All rights reserved.