Time Dependence of Optical Properties of Vacuum-Evaporated Poly(di-methyl silane) Thin Films

概要

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In this paper, we show an interesting change in the optical properties of poly(di-methyl silane) thin films prepared by vacuum evaporation. We have found that the strength of the optical absorption peak at ${\sim}300$ nm is changed depending on the substrate temperature during the deposition. The strength of the optical absorption peak at ${\sim}300$ nm decreases with increasing time when the thin film is prepared at a high substrate temperature. On the other hand, the peak does not appear when the thin film is prepared at a low substrate temperature. However, in the latter case, the optical absorption peak appears at ${\sim}300$ nm with time. Moreover, the change of the optical absorption strength of the specimen held in a vacuum desiccator is different from that of the specimen held in atmosphere. It is considered that the decrease of the optical absorption strength at ${\sim}300$ nm is due to the decrease of the molecular weight of polysilanes, and the increase is due to the structural relaxation of polysilane chains.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-01-15