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Photoinduced phenomena in amorphous Se: overview and notions

K. TANAKA1,*

Affiliation

  1. Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo, Japan

Abstract

Amorphous chalcogenide semiconductors exhibit a variety of light-induced phenomena, such as darkening, fluidity, deformation, crystallization, and phase change, some of which appear anisotropically upon illumination of linearly-polarized light. For studying these phenomena, Se may be the most suitable, since its microscopic structure is simple, being composed with entangled chains consisting of only homopolar bonds. Hence, after briefly reviewing light-induced changes in Se, including the phase change, we explore relationships between photodarkening and photo-crystallization, using a configurational diagram. Roles of athermal and thermal effects are quantitatively discussed. Besides, a model for understanding unique features of the anisotropic deformations is proposed..

Keywords

Selenium, Chalcogenide, Photodarkening, Photo-crystallization, Phase change, Anisotropy.

Submitted at: Oct. 19, 2021
Accepted at: Feb. 11, 2022

Citation

K. TANAKA, Photoinduced phenomena in amorphous Se: overview and notions, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 1-2, pp. 1-8 (2022)