Low voltage operating OFETs based on solution-processed metal phthalocyanines |
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Authors: | G Chaidogiannos F Petraki N Glezos S Kennou and S Ne?p?rek |
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Institution: | (1) Institute of Microelectronics, NCSR Demokritos, 15310 Aghia Paraskevi, Attiki, Greece;(2) Department of Chemical Engineering, University of Patras and FORTH/ICE-HT, 26504 Rion, Patras, Greece;(3) Institute of Macromolecular Chemistry AS CR, v.v.i., 162 06 Prague 6, Czech Republic |
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Abstract: | The class of sodium salts of sulphonated metal phthalocyanines (MePCS
x
, S = SO3Na, x=1–4) was investigated as a p-type channel component in organic field-effect transistors (OFETs). The solubility of these
materials appears to be enhanced compared to their non-sulphonated counterparts (MePCs). We fabricated transistors based on
MePCS
x
varying the central metal atom (Me = Ni, Co, Zn, Al) and we evaluated the dependence of transistor performance on the nature
of the central atom and the degree of sulphonation. The best results were obtained in the case of Ni and low sulphur content.
In this case the mobility value is μ=1.08 cm2 V−1 s−1 and the on/off current ratio ∼103. The degree of sulphonation affects the electric field inside the active film in a way analogous to the case of polyelectrolyte-gated
OFETs. The Na+ counter ions present in the channel contribute to the device characteristics but their concentration should be controlled
in order to optimize device performance. |
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Keywords: | PACS" target="_blank">PACS 72 80 Le 73 50 Dn 73 61 Ph |
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