High Performance Organic Semiconductors with High Field-Effect Mobilities and Low Contact Resistances for Flexible Displays

Abstract

We have succeeded in developing high-performance ptype of organic semiconductors with phenylethynyl groups, which have high filed-effect mobilities (> 3 cm 2 V −1 s −1) by improving molecular planarity. A single crystal of the organic semiconductors has a herringbone structure. It plays an important role for carrier transport. In addition, we found that they had lower contact resistances to Au electrodes as well. Then, we used the materials for the carrier injection layer deposited onto another organic semiconductor we developed recently, which achieved a high field-effect mobility, and a low threshold voltage (V th).

High-Mobility Organic Thin-Film Transistors Over 10 cm2 V-1 s-1 Fabricated Using Bis(benzothieno)naphthalene Polycrystalline Films

“…This decrease in the mobility also indicates the relatively large contact resistance, so a high mobility with a short channel would be obtained by reducing contact resistance. 15) Figure 5 shows the surface morphology of the C 7 -BBTN film on the Parylene-C film measured by atomic force microscopy (AFM). Large grains were not observed, because surface roughness of the Parylene-C is quite large (RMS 7 nm).…”