Premium
Fully R2R‐Printed Carbon‐Nanotube‐Based Limitless Length of Flexible Active‐Matrix for Electrophoretic Display Application
Author(s) -
Sun Junfeng,
Sapkota Ashish,
Park Hyejin,
Wesley Prince,
Jung Younsu,
Maskey Bijendra Bishow,
Kim Yushin,
Majima Yutaka,
Ding Jianfu,
Ouyang Jianying,
Guo Chang,
Lefebvre Jacques,
Li Zhao,
Malenfant Patrick R. L.,
Javey Ali,
Cho Gyoujin
Publication year - 2020
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.201901431
Subject(s) - materials science , thin film transistor , carbon nanotube , fabrication , active matrix , inkwell , nanotechnology , roll to roll processing , flexible display , transistor , electrophoresis , optoelectronics , diode , polymer , printed electronics , oled , voltage , composite material , electrical engineering , layer (electronics) , medicine , chemistry , alternative medicine , engineering , pathology , chromatography
A limitless‐length flexible active‐matrix implies that virtually any surface can be rendered into an interactive medium when laminated with electrophoretic or organic light‐emitting diode sheets. However, performance, cost, and size limitations of current fabrication technologies and semiconducting materials, typically utilized in thin film transistor (TFT) active matrices (TFT‐AMs), have hindered progress, thus preventing the realization of fully printed TFT‐AMs on a plastic roll. A new high‐purity semiconducting single‐walled carbon nanotube (s‐SWCNT) ink is prepared by first isolating 99.9% pure s‐SWCNTs via conjugated polymer extraction, and then utilizing a ligand‐exchange method to formulate a novel hydrophilic gravure‐compatible semiconducting ink. Based on the s‐SWCNT ink, a fully additive manufacturing process using roll‐to‐roll (R2R) gravure printing enables the fabrication of a flexible TFT‐AM, overcoming performance, cost, and size limitations. TFT‐AMs with 10 to 40 PPI resolution where average mobility of 0.23 ± 0.12 cm 2 V −1 s −1 , average on–off ratio of 10 4.1 , and threshold voltage variation of ±13% are attained. As a proof of concept, an inexpensive and flexible electrophoretic display is demonstrated by simply laminating an electrophoretic sheet onto the R2R gravure‐printed s‐SWCNT‐based TFT‐AM.