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Phys. Rev. B 42, 6853–6856 (1990)

Photoinduced valence instability in the organic molecular compound tetrathiafulvalene-p-chloranil (TTF-CA)

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S. Koshihara and Y. Tokura
Department of Physics, University of Tokyo, Tokyo 113, Japan

T. Mitani
Institute for Molecular Science, Okazaki 444, Japan

G. Saito
Department of Chemistry, Kyoto University, Kyoto, Japan

T. Koda
Department of Applied Physics, University of Tokyo, Tokyo 113, Japan

Received 24 July 1990; published in the issue dated 1 October 1990

It was found that a local charge-transfer excitation on the donor(D)-acceptor(A) pair leads to a semimacroscopic valence change from the quasi-ionic (D+A-) to quasineutral (D0A0) states in organic molecular-compound TTF-chloranil with mixed DA stacks. Photogenerated neutral-ionic domain walls, which are responsible for anomalous photoconductivity, show the temporal annihilation due to the one-dimensional recombination.

© 1990 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.42.6853
DOI:
10.1103/PhysRevB.42.6853
PACS:
72.60.+g, 72.80.Le, 71.55.Ht
 
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