A new electrode design for ambipolar injection in organic semiconductors

Thangavel Kanagasekaran (), Hidekazu Shimotani (), Ryota Shimizu, Taro Hitosugi and Katsumi Tanigaki ()
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Thangavel Kanagasekaran: Tohoku University
Hidekazu Shimotani: Tohoku University
Ryota Shimizu: Tohoku University
Taro Hitosugi: Tohoku University
Katsumi Tanigaki: Tohoku University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Organic semiconductors have attracted much attention for low-cost, flexible and human-friendly optoelectronics. However, achieving high electron-injection efficiency is difficult from air-stable electrodes and cannot be equivalent to that of holes. Here, we present a novel concept of electrode composed of a bilayer of tetratetracontane (TTC) and polycrystalline organic semiconductors (pc-OSC) covered by a metal layer. Field-effect transistors of single-crystal organic semiconductors with the new electrodes of M/pc-OSC/TTC (M: Ca or Au) show both highly efficient electron and hole injection. Contact resistance for electron injection from Au/pc-OSC/TTC and hole injection from Ca/pc-OSC/TTC are comparable to those for electron injection from Ca and hole injection from Au, respectively. Furthermore, the highest field-effect mobilities of holes (22 cm2 V–1 s–1) and electrons (5.0 cm2 V–1 s–1) are observed in rubrene among field-effect transistors with electrodes so far proposed by employing Ca/pc-OSC/TTC and Au/pc-OSC/TTC electrodes for electron and hole injection, respectively.

Date: 2017
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DOI: 10.1038/s41467-017-01047-9

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