Kim, Youngrok Broch, Katharina Lee, Woocheol Ahn, Hebeom Lee, Jonghoon Yoo, Daekyoung Kim, Junwoo Chung, Seungjun Sirringhaus, Henning Kang, Keehoon Lee, Takhee 2024-01-19T17:04:02Z 2024-01-19T17:04:02Z 2021-09-05 2020-07 1616-301X https://pubs.kist.re.kr/handle/201004/118432 In organic device applications, a high contact resistance between metal electrodes and organic semiconductors prevents an efficient charge injection and extraction, which fundamentally limits the device performance. Recently, various contact doping methods have been reported as an effective way to resolve the contact resistance problem. However, the contact doping has not been explored extensively in organic field effect transistors (OFETs) due to dopant diffusion problem, which significantly degrades the device stability by damaging the ON/OFF switching performance. Here, the stability of a contact doping method is improved by incorporating "dopant-blockade molecules" in the poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) film in order to suppress the diffusion of the dopant molecules. By carefully selecting the dopant-blockade molecules for effectively blocking the dopant diffusion paths, the ON/OFF ratio of PBTTT OFETs can be maintained over 2 months. This work will maximize the potential of OFETs by employing the contact doping method as a promising route toward resolving the contact resistance problem. English WILEY-V C H VERLAG GMBH SELF-ASSEMBLED MONOLAYERS SEMICONDUCTING POLYMER-FILMS CHARGE INJECTION HIGH-MOBILITY MOLECULAR DOPANT PERFORMANCE TRANSPORT DIFFUSION AMBIPOLAR ELECTRON Highly Stable Contact Doping in Organic Field Effect Transistors by Dopant-Blockade Method Article 10.1002/adfm.202000058 1 ADVANCED FUNCTIONAL MATERIALS, v.30, no.28 ADVANCED FUNCTIONAL MATERIALS 30 28 scie scopus 000535085100001 2-s2.0-85085511151 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article SELF-ASSEMBLED MONOLAYERS SEMICONDUCTING POLYMER-FILMS CHARGE INJECTION HIGH-MOBILITY MOLECULAR DOPANT PERFORMANCE TRANSPORT DIFFUSION AMBIPOLAR ELECTRON 2 3 5 6-tetrafluoro-7 7 8 8-tetracyanoquinodimethane contact doping dopant-blockade poly(2 5-bis(3-hexadecylthiophen-2-yl)thieno[3 2-b]thiophene) solid-state diffusion tetracyanoquinodimethane