SSDM Best Student Award － Hiroki Nakano （Iino Laboratory）－

Hiroki Nakano (Electrical and Electronic Engineering), Hiroaki Iino (Associate Professor)

SSDM Best Student Award

2024 International Conference on Solid State Devices and Materials (SSDM 2024)

September 16, 2025

Control of dopant distribution in organic semiconductor thin films using fluidity of liquid crystallinity

In organic electronic devices, contact resistance at the interface between the electrode and the semiconductor is a critical issue that strongly affects device performance. In particular, high-cost electrode materials are often used to reduce contact resistance, which can undermine the low-cost advantage of organic electronics. In this study, we focused on the fluidity of liquid-crystalline organic semiconductors and proposed a method to move and accumulate dopant molecules toward the electrode interface by applying a voltage in the liquid crystal phase. This approach enables interfacial doping by localizing dopants near the electrode interface and makes it possible to reduce contact resistance through the reduction of the carrier injection barrier. In this method, dopant molecules respond to the electric field and spontaneously migrate toward the electrode interface, thereby realizing interfacial doping. Therefore, the method is advantageous because it does not depend on electrode materials or device structures. This work is expected to contribute to the realization of high-performance organic electronic devices using low-cost electrodes.