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Phys. Rev. B 56, R485–R488 (1997)

Experimental evidence for negative correlation energy and valence alternation in amorphous selenium

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A. V. Kolobov

Joint Research Center for Atom Technology–National Institute for Advanced Interdisciplinary Research, 1-1-4 Higashi, Tsukuba, Ibaraki 305, Japan

M. Kondo and H. Oyanagi
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan

R. Durny

Joint Research Center for Atom Technology–National Institute for Advanced Interdisciplinary Research, 1-1-4 Higashi, Tsukuba, Ibaraki 305, Japan

A. Matsuda
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan

K. Tanaka

Joint Research Center for Atom Technology–National Institute for Advanced Interdisciplinary Research, 1-1-4 Higashi, Tsukuba, Ibaraki 305, Japan

Received 15 April 1997; published in the issue dated 1 July 1997

Two different kinds of electron spin resonance signals, triclinic and isotropic, are observed in amorphous selenium under photoexcitation at 20 K, their concentration being around 1020 cm-3. At higher temperatures, isotropic centers are converted into triclinic ones. These centers are identified as singly and triply coordinated Se defects. The results present experimental evidence for negative-U centers and valence alternation in amorphous selenium.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.56.R485
DOI:
10.1103/PhysRevB.56.R485
PACS:
76.30.Mi, 61.43.Dq, 61.72.Ji, 61.80.Ba
 
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