PHOTOSTRUCTURAL TRANSFORMATIONS IN AMORPHOUS AS2SE3 AND AS2S3 FILMS
PHOTOSTRUCTURAL TRANSFORMATIONS IN AMORPHOUS AS2SE3 AND AS2S3 FILMS
复制标题
DOI：
10.1016/0022-3093(74)90091-x
复制
发表时间：
1974-01-01
影响因子：
3.5
通讯作者：
OVSHINSKY, SR
中科院分区：
文献类型：
--
作者：
DENEUFVILLE, JP;MOSS, SC;OVSHINSKY, SR
通过对非晶As2Se3和As2S3薄膜结构和光学性质的影响，研究了光照和退火对薄膜的影响。结果表明，蒸发薄膜中主要的光结构变化是沉积分子（As4S6 或 As4Se6）玻璃通过照明或加热发生的聚合。这种不可逆聚合引起大的吸收边向较小能量的转移，并引起明显的折射率变化。此外，还有一个小的可逆吸收边位移，这可能是由于光生电子和空穴的俘获，As2S3 中的吸收边位移比 As2Se3 中的大。这种可逆性在良好退火的蒸发膜和溅射膜中都持续存在，它们在结构上似乎彼此无法区分，并且除了缺陷或空隙之外，与块状玻璃也无法区分。与不可逆聚合变化相比，这种可逆效应称为光暗化，其折射率变化可以忽略不计。讨论了当前结果在光化学效应中的应用。
The influence of illumination and annealing on thin films of amorphous As2Se3and As2S3has been studied through their effects on the structure and optical properties. It is shown that the dominant photostructural change in evaporated films is the polymerization of the as-deposited molecular (As4S6or As4Se6) glass through either illumination or heating. This irreversible polymerization gives rise to a large absorption edge shift to smaller energy and to an appreciable index of refraction change. In addition there is a small reversible absorption edge shift, due presumably to trapping of photo-generated electrons and holes which is larger in As2S3than in As2Se3. This reversibility persists in both well-annealed evaporated films and in sputtered films which appear to be structurally indistinguishable both from each other and, aside from defects or voids, from the bulk glass. The reversible effect, called photo-darkening, is accompanied by a negligible refractive index change when compared with the irreversible polymerization change. The application of the present results to photochemical effects is discussed.