Thiophene-Thiazole-Based Semiconducting Copolymers for High-Performance Polymer Field-Effect Transistors

Authors

Jong Won Chung, Samsung Electronics Co., Ltd.
Won-Tae Park, Dongguk University
Jeong-Il Park, Samsung Electronics Co., Ltd.
Youngjun Yun, Samsung Electronics Co., Ltd.Follow
Xiaodan Gu, University of Southern MississippiFollow
Jiyoul Lee, Pukyong National UniversityFollow
Yong-Young Noh, Dongguk UniversityFollow

Document Type

Article

Publication Date

10-19-2017

Department

Polymers and High Performance Materials

School

Mathematics and Natural Sciences

Abstract

We report a newly synthesized donor (D)–acceptor (A)type semiconducting copolymer, consisting of thiophene as an electron-donating unit and thiazole as an electron-accepting unit (PQTBTz-TT-C8) for the active layer of the organic field-effect transistors (OFETs). Specifically, this study investigates the structure and electrical property relationships of PQTBTz-TT-C8 with comprehensive analyses on the charge-transporting properties corresponding to the spin rate of the spin coater during the formation of the PQTBTz-TT-C8 film. The crystallinity of PQTBTz-TT-C8 films is examined with grazing incidence X-ray diffraction. Temperature-dependent transfer measurements of the OFETs are conducted to extract the density of states (DOS) and characterize the charge-transport properties. Comparative analyses on charge transports within the framework of the physical model, based on polaron hopping and Gaussian DOS, reveal that the prefactors of both physical charge-transport models are independent of the spin-coating condition for the films. For staggered structural transistors, however, the thickness of the PQTBTz-TT-C8 films, which strongly affect the series resistance along the charge-transfer path in a vertical direction, is changed in accordance with the spin-coating rate. In other words, the spin-coating rate of the PQTBTz-TT-C8 films influences the thickness of the polymer films, yet any significant changes in the crystallinity of the film or electronic coupling between the neighboring molecules upon the spin-coating condition were barely noticeable. Because the PQTBTz-TT-C8 backbone chains inside the thin film are stacked up with the edge-on, the series resistances are changed according to the thickness of the film and thus the performance of the device varies depending on the thickness.

Publication Title

ACS Applied Materials & Interfaces

Volume

44

Issue

4

First Page

38728

Last Page

38736

Recommended Citation

Chung, J. W., Park, W., Park, J., Yun, Y., Gu, X., Lee, J., Noh, Y. (2017). Thiophene-Thiazole-Based Semiconducting Copolymers for High-Performance Polymer Field-Effect Transistors. ACS Applied Materials & Interfaces, 44(4), 38728-38736.
Available at: https://aquila.usm.edu/fac_pubs/16660