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Atomic scale computer simulations on structures and photo induced volumechanges of flatly and obliquely deposited amorphous selenium films have beencarried out in order to understand how the properties of chalcogenide glassesare influenced by their preparation method. Obliquely deposited a-Se thin filmscontain more coordination defects, larger voids than the flatly deposited ones.To model the photo induced volume changes the electron excitation and holecreation were treated independently within the framework of tight-bindingformalism. Covalent and interchain bond breakings and formations were found.The obliquely deposited samples containing voids showed a wide spectrum ofphoto induced structural changes in microscopic and volume changes inmacroscopic levels.

Structure and photo-induced volume changes of obliquely deposited amorphous selenium