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Enhanced Charge Injection Properties of Organic Field‐Effect Transistor by Molecular Implantation Doping
Author(s) -
Kim Youngrok,
Chung Seungjun,
Cho Kyungjune,
Harkin David,
Hwang WangTaek,
Yoo Daekyoung,
Kim JaeKeun,
Lee Woocheol,
Song Younggul,
Ahn Heebeom,
Hong Yongtaek,
Sirringhaus Henning,
Kang Keehoon,
Lee Takhee
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201806697
Subject(s) - materials science , doping , organic semiconductor , optoelectronics , monolayer , field effect transistor , schottky barrier , contact resistance , organic field effect transistor , nanotechnology , transistor , organic electronics , voltage , electrical engineering , layer (electronics) , engineering , diode
Organic semiconductors (OSCs) have been widely studied due to their merits such as mechanical flexibility, solution processability, and large‐area fabrication. However, OSC devices still have to overcome contact resistance issues for better performances. Because of the Schottky contact at the metal–OSC interfaces, a non‐ideal transfer curve feature often appears in the low‐drain voltage region. To improve the contact properties of OSCs, there have been several methods reported, including interface treatment by self‐assembled monolayers and introducing charge injection layers. Here, a selective contact doping of 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F 4 ‐TCNQ) by solid‐state diffusion in poly(2,5‐bis(3‐hexadecylthiophen‐2‐yl)thieno[3,2‐b]thiophene) (PBTTT) to enhance carrier injection in bottom‐gate PBTTT organic field‐effect transistors (OFETs) is demonstrated. Furthermore, the effect of post‐doping treatment on diffusion of F 4 ‐TCNQ molecules in order to improve the device stability is investigated. In addition, the application of the doping technique to the low‐voltage operation of PBTTT OFETs with high‐ k gate dielectrics demonstrated a potential for designing scalable and low‐power organic devices by utilizing doping of conjugated polymers.