A new electrode design for ambipolar carrier injection in organic semiconductors and its applications to light emitting diodes
ORAL
Abstract
Organic semiconductors (OSCs) 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 (M) thin film layer. Field-effect transistors of single crystal organic semiconductors (sc-OSCs) with the new electrodes of M/pc-OSC/TTC (M: Ca or Au) show both highly-efficient electron and hole injection. Contact resistances of electron and hole injection from Ca/pc-OSC/TTC and Au/pc-OSC/TTC are lower than those from pure Ca for electrons and Au for holes, respectively. Equivalent high field-effect mobilities of holes (22 cm2V–1s–1) and electrons (5.0 cm2V–1s–1) were observed in a rubrene single crystal, which are the highest among field-effect transistors with electrodes so far proposed. The new electronde are useful in high performance and air stable lihgt emitting field-effect transistors.
*This work was partially supported by JSPS KAKENHI Grant Number JP17H05326, and the financial support for collarborative researches by AIMR, Tohohku University.
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Presenters
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Kasumi Tanigaki
- Dept. of Physics, Tohoku Univ
- Tohoku Univ