Carrier doping to the organic Mott insulator by conjugating with tetrathiafulvalene

The electrical conductivity of the organic Mott insulator ET-F2TCNQ (ET = bis(ethylenedithio)tetrathiafulvalene, F2TCNQ = 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane) crystal was found to be enhanced by conjugation with a tetrathiafulvalene (TTF) single crystal on its surface; surface sheet resist...

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Bibliographic Details
Published in:Applied physics letters 2012-09, Vol.101 (10)
Main Authors: Takahashi, Y., Nakagawa, Y., Hayakawa, K., Inabe, T., Naito, T.
Format: Article
Language:English
Subjects:
Charge
Conjugation
Crystals
Doping
Electrical resistivity
Insulators
Microscopy
Resistivity
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Summary:The electrical conductivity of the organic Mott insulator ET-F2TCNQ (ET = bis(ethylenedithio)tetrathiafulvalene, F2TCNQ = 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane) crystal was found to be enhanced by conjugation with a tetrathiafulvalene (TTF) single crystal on its surface; surface sheet resistance decreased from 5 × l05 to 2 × 103 Ω/sq. The mechanism of this decrement was investigated through optical and atomic force microscopy measurements at the interface. When TTF was conjugated to the ET-F2TCNQ crystal, electron injection from TTF and complex formation between TTF and F2TCNQ occurred. Neutral ET molecules were consequently generated at the interface, and this charge doping broke the Mott insulating state.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4750066