Layered distribution of charge carriers in organic thin film transistors

Layered distribution of charge carriers in organic thin film transistors

Drain-source current in organic thin-film transistors has been monitored in situ and in real time during the deposition of pentacene. The current starts to flow when percolation of the first monolayer (ML) occurs and, depending on the deposition rate, saturates at a coverage in the range 2-7 MLs. Th...

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Veröffentlicht in:Physical review letters 2010-06, Vol.104 (24), p.246602-246602, Article 246602
Hauptverfasser: Shehu, Arian, Quiroga, Santiago D, D'Angelo, Pasquale, Albonetti, Cristiano, Borgatti, Francesco, Murgia, Mauro, Scorzoni, Andrea, Stoliar, Pablo, Biscarini, Fabio
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container_end_page 246602
container_issue 24
container_start_page 246602
container_title Physical review letters
container_volume 104
creator Shehu, Arian
Quiroga, Santiago D
D'Angelo, Pasquale
Albonetti, Cristiano
Borgatti, Francesco
Murgia, Mauro
Scorzoni, Andrea
Stoliar, Pablo
Biscarini, Fabio
description Drain-source current in organic thin-film transistors has been monitored in situ and in real time during the deposition of pentacene. The current starts to flow when percolation of the first monolayer (ML) occurs and, depending on the deposition rate, saturates at a coverage in the range 2-7 MLs. The number of active layers contributing to the current and the spatial distribution of charge carriers are modulated by the growth mode. The thickness of the accumulation layer, represented by an effective Debye length, scales as the morphological correlation length. These results show that the effective Debye length is not just a material parameter, but depends on the multiscale morphology. Earlier controversial results can be unified within this framework.
doi_str_mv 10.1103/physrevlett.104.246602
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