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Ambipolar Organic Field‐Effect Transistors Based on a Dual‐Function, Ultrathin and Highly Crystalline 2,9‐didecyldinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (C 10 ‐DNTT) Layer
Author(s) -
Huang Shuyun,
Peng Boyu,
Chan Paddy Kwok Leung
Publication year - 2017
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700268
Subject(s) - materials science , ambipolar diffusion , organic semiconductor , organic field effect transistor , thiophene , monolayer , bilayer , alkyl , field effect transistor , organic electronics , semiconductor , stacking , optoelectronics , nanotechnology , transistor , organic chemistry , chemistry , biochemistry , physics , plasma , quantum mechanics , voltage , membrane
Ultrathin organic semiconductor thin films have great value in the investigation of carrier transport behavior in organic field‐effect transistors (OFETs). Here, the dual solution shearing (DSS) method is adopted to deposit ultrathin and closely packed 2,9‐didecyldinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (C 10 ‐DNTT) films. This smooth, ultrathin and highly crystalline DSS‐processed C 10 ‐DNTT layer can be utilized in p–n stacking bilayer ambipolar OFETs. It has two major functions in the bilayer OFET: (i) it acts as the p‐channel active layer; and (ii) it serves as the growth template of the upper n‐type semiconductor layer. The closely packed alkyl side chains of the C 10 ‐DNTT molecules behave like long alkyl chains in the self‐assembled monolayer and can assist the packing and orientation of the following layer. The F 16 CuPc layer grown on DSS‐processed C 10 ‐DNTT shows crystallized lamellae structure. The smooth C 10 ‐DNTT surface can suppress the trap states and enhance the charge transfer between the p–n layer interface. The drain‐source current ( I DS ) in the p‐channel and n‐channel shows a threefold and fivefold increase compared with two‐step thermal evaporation. These findings demonstrate the potential of using solution‐processed ultrathin organic semiconductor in multilayer organic electronics, which cannot be easily achieved by the conventional thermal evaporation approach.