Lithium benzoate doped high performance n-type diketopyrrolopyrrole based organic thin-film transistors. (March 2019)

• Record Type: Journal Article
• Authors: Huseynova, Gunel; Shin, Eul-Yong; Park, Won-Tae; Noh, Yong-Young
• Is Part Of: Dyes and pigments. Volume 162(2019)
• Page Start: 243
• Page End: 248
• Publication Date: 2019-03
• Subjects: Electron dopant -- Lithium benzoate -- Lewis base -- Diketopyrrolopyrrole -- Organic thin-film transistor; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.10.032
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: We report lithium benzoate (LB) as an effective electron dopant for commonly used diketopyrrolopyrrole (DDP) based electron donor-acceptor conjugated polymers and its application in organic thin-film transistors (OTFTs). Three DPP derivative classes were considered: ambipolar, electron dominant, and hole dominant semiconducting polymers. Applying LB dopant at the contact or semiconducting layer bulk significantly improved overall n-channel performance more than 100-fold, such as electron mobility and on/off current ratio for solution-processed DPP based OTFTs compared with pristine devices. The best DPP based OTFTs with LB achieved high electron mobility (0.6 cm 2 V −1 s −1 ) with excellent operational stability. In particular, complete ambipolar transport modulation to unipolar n-type was achieved for n-channel dominant OTFTs devices. Highlights: Lithium benzoate (LB) is introduced as an n-channel dopant for conjugated polymers. Electron mobility and on/off ratio of OTFTs is significantly improved more than 100 times. Polarity of the devices is effectively tuned from ambipolar to unipolar n-type by LB doping. Remarkably enhanced n-channel operational stability is achieved.