On-state performance enhancement of copolymer-based organic field effect transistors enabled by an organic metal salt dopant
Abstract
Organic field effect transistors (OFETs) based on copolymers are promising for flexible and stretchable electronics, yet their large-scale application is often limited by relatively poor performance. This work demonstrates a universal and effective doping strategy employing the organic metal salt lithium tetrakis (pentafluorophenyl) borate ethyl etherate (Li-TPFPB) to significantly enhance the on-state performance of copolymer OFETs. Employing a simple solution mixing method with an optimized doping ratio (3 wt. %), multiple key device parameters are improved simultaneously without compromising the on/off ratio. This improvement is proven to be universal across different copolymer semiconductors and metal electrodes combinations. Systematic investigations reveal that the performance improvement primarily originates from a substantial reduction in trap density within the copolymer semiconductor at optimal doping ratios, which facilitates more efficient charge transport. However, excessive doping (>3 wt. %) leads to increased structural disorder and trap density, causing device degradation. This study not only identifies Li-TPFPB as an effective dopant for OFETs but also provides a comprehensive mechanistic understanding of doping ratio dependent performance, paving a simple route toward high-performance, solution-processed OFETs.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (14)
Hengdian Chang
College of Integrated Circuit Science and Engineering, National & Local Joint Engineering Laboratory for RF Integration and Micro-packaging Technologies, Nanjing University of Posts and Telecommunications 1 , No. 9 Wenyuan Rd., Nanjing,
Jun Zhang
Jintao Bian
College of Integrated Circuit Science and Engineering, National & Local Joint Engineering Laboratory for RF Integration and Micro-packaging Technologies, Nanjing University of Posts and Telecommunications 1 ; No. 9 Wenyuan Rd., Nanjing,
Yuan Yang
Haonan Lin
Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen China
Haowen Qian
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NJUPT) 3 , Nanjing 210023,
Jiafei Yao
College of Integrated Circuit Science and Engineering, National & Local Joint Engineering Laboratory for RF Integration and Micro-packaging Technologies, Nanjing University of Posts and Telecommunications 1 , No. 9 Wenyuan Rd., Nanjing,
Kemeng Yang
College of Integrated Circuit Science and Engineering, National & Local Joint Engineering Laboratory for RF Integration and Micro-packaging Technologies, Nanjing University of Posts and Telecommunications 1 , No. 9 Wenyuan Rd., Nanjing,
Jing Chen
Man Li
Wen Li
Mingdong Yi
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NJUPT) 3 , Nanjing 210023,
Song Bai
Yufeng Guo