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Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays
Author(s) -
Duan Shuming,
Gao Xiong,
Wang Yu,
Yang Fangxu,
Chen Mingxi,
Zhang Xiaotao,
Ren Xiaochen,
Hu Wenping
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201807975
Subject(s) - materials science , fabrication , organic semiconductor , thin film transistor , nanotechnology , printed electronics , thin film , organic electronics , crystallization , optoelectronics , crystallinity , semiconductor , roll to roll processing , substrate (aquarium) , transistor , inkwell , chemical engineering , layer (electronics) , electrical engineering , composite material , medicine , oceanography , alternative medicine , engineering , pathology , voltage , geology
Control over the morphology and crystallinity of small‐molecule organic semiconductor (OSC) films is of key importance to enable high‐performance organic optoelectronic devices. However, such control remains particularly challenging for solution‐processed OSC devices because of the complex crystallization kinetics of small‐molecule OSC materials in the dynamic flow of inks. Here, a simple yet effective channel‐restricted screen‐printing method is reported, which uses small‐molecule OSCs/insulating polymer to yield large‐grained small‐molecule OSC thin‐film arrays with good crystallization and preferred orientation. The use of cross‐linked organic polymer banks produces a confinement effect to trigger the outward convective flow at two sides of the channel by the fast solvent evaporation, which imparts the transport of small‐molecule OSC solutes and promotes the growth of small‐molecule OSC crystals parallel to the channel. The small‐molecule OSC thin‐film array produced by screen printing exhibits excellent performance characteristics with an average mobility of 7.94 cm 2 V −1 s −1 and a maximum mobility of 12.10 cm 2 V −1 s −1 , which are on par with its single crystal. Finally, screen printing can be carried out using a flexible substrate, with good performance. These demonstrations bring this robust screen‐printing method closer to industrial application and expand its applicability to various flexible electronics.