By O. Madelung

Festkörper Probleme IX: Advances in sturdy country Physics provides a version for the habit of electrons in non-crystalline fabrics. This e-book describes a few experimental facts that helps for the habit of electrons. geared up into sixteen chapters, this booklet starts off with an summary of crystallization, glass forming, and melting approaches in structures forming chalcogenide glasses. this article then describes the speculation of the shipping homes of electrons in non-crystalline solids and beverages. different chapters contemplate the optical and electric homes of amorphous semiconductors in which the therapy is principally constrained to the weather selenium, germanium, and tellurium. This publication discusses in addition the elemental elements of the optical phenomena of the Jahn-Teller impression, with emphasis on a few standards of the energy and observability of the Jahn-Teller influence. the ultimate bankruptcy offers with the equipment for processing emulsion and steel movie mask. This booklet is a useful source for stable country physicists.

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Die Zunahme des elektrischen Bandabstandes ist bei Tellur wegen der Kantenverschiebung ebenfalls relativ groß, nämlich 0,54 eV [26]. Sie ist also größer als der Bandabstand des trigonalen Tellurs selbst, der 0,33 eV beträgt. Auch bei amorphem Tellur liegt der Wert der Absorptionskonstanten bei dem elektrischen Bandabstand 4 1 etwas oberhalb von 10 cm" . Die Verhältnisse bei Selen rechts sind qualitativ gleich, nur ist hier die Abnahme der Kantensteigung beim Übergang zur amorphen Phase kleiner als bei Tellur.

15 suggests, then acceptors must exist in amorphous germanium. One does not know what they are, but a reasonable conjecture is that they consist of germanium atoms at sites where the co-ordination number is three, so that a single electron is in an s-p orbital with no other electron with which to form a bond (fîg s 14). They could give rise to extrinsic conduction and impurity conduction (if there is any compensation). There is a rapid drop in the conductivity on annealing, presumably due to the disappearance on these centres or to the setting up of barriers of some kind [ 2 8 ] ) .

Das gerade in jüngster Zeit stark wachsende Interesse hängt wohl mit der Tatsache zusammen, daß sich neben den wissenschaftlichen Problemen auch neue technische Anwendungen [3] in den Vordergrund schieben. In dieser Übersicht sollen aber nicht diese interessanten technischen Möglichkeiten, sondern nur die wichtigsten optischen und elektrischen Eigenschaften von amorphen Halbleitern behandelt werden. In dem vorhergehenden Artikel von Krebs [4] wird dargelegt, daß beim Übergang von der kristallinen zur amorphen Phase die Fernordnung zerstört wird, die Nahordnung aber erhalten bleibt.

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