期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202111285
关键词
free carriers; mobility; organic field-effect transistors; organic salt doping; traps
类别
资金
- Natural Science Foundation of China [61774061, 61504043, 62074054]
- NSAF Foundation of China [U1830130]
- Natural Science Foundation of Shanghai [19ZR1473400]
- young scientist project of MOE innovation platform
- National R&D Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2020R1A4A1019455]
A new doping system using an organic salt p-dopant is reported to significantly improve the device performance of organic field-effect transistors (OFETs). The optimized doping ratios increase the hole mobility and reduce the threshold voltage, while also reducing contact resistance and activation energy. The study also explores the impact of doping ratios on trap density.
Doping is an effective strategy for controlling the charge density and device performance of thin-film electronics. Herein, a new doping system is reported for organic electronics using the organic salt p-dopant N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate (DTB) to significantly improve the device performance of indacenodithiophene-co-benzothia-diazole (IDT-BT) organic field-effect transistors (OFETs). With optimized doping ratios, the hole mobility increases almost fourfold from 0.32 to 1.15 cm(2) V-1 s(-1) and the threshold voltage reduces from -38 to 0 V. Moreover, systematical electrical characterizations demonstrate that the contact resistance and activation energy dramatically reduce in the doped devices. Such reductions are ascribed to the shift of the Fermi energy level closer to the transport level and the lowered density of trap states in doped semiconductors, as revealed by ultraviolet photoelectron spectroscopy and low-frequency noise measurements, respectively. This study also demonstrates that the trap density increases when the doping ratio is high, explaining the device performance degradation at high doping ratios. This is the first time that DTB organic salt is used as an efficient dopant to improve the performance of OFETs, demonstrating a promising route for employing organic salt dopants to achieve high-performance OFETs.
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