Super‐ and Ferroelastic Organic Semiconductors for Ultraflexible Single‐Crystal Electronics

Like silicon, single crystals of organic semiconductors are pursued to attain intrinsic charge transport properties. However, they are intolerant to mechanical deformation, impeding their application in flexible electronic devices. Such contradictory properties, namely exceptional molecular ordering...

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Published in:Angewandte Chemie (International ed.) 2020-07, Vol.59 (31), p.13004-13012
Main Authors: Park, Sang Kyu, Sun, Hong, Chung, Hyunjoong, Patel, Bijal B., Zhang, Fengjiao, Davies, Daniel W., Woods, Toby J., Zhao, Kejie, Diao, Ying
Format: Article
Language:English
Subjects:
Bending machines
Carrier mobility
Charge transport
Crystal structure
Crystals
Current carriers
Electronic devices
Electronic equipment
Electronics
Electronics industry
Ferroelasticity
Molecular electronics
Organic semiconductors
phase transitions
polymorphism
Robotics
Semiconductors
Single crystals
Superelasticity
Transport properties
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Summary:Like silicon, single crystals of organic semiconductors are pursued to attain intrinsic charge transport properties. However, they are intolerant to mechanical deformation, impeding their application in flexible electronic devices. Such contradictory properties, namely exceptional molecular ordering and mechanical flexibility, are unified in this work. We found that bis(triisopropylsilylethynyl)pentacene (TIPS‐P) crystals can undergo mechanically induced structural transitions to exhibit superelasticity and ferroelasticity. These properties arise from cooperative and correlated molecular displacements and rotations in response to mechanical stress. By utilizing a bending‐induced ferroelastic transition of TIPS‐P, flexible single‐crystal electronic devices were obtained that can tolerate strains (ϵ) of more than 13 % while maintaining the charge carrier mobility of unstrained crystals (μ>0.7 μ0). Our work will pave the way for high‐performance ultraflexible single‐crystal organic electronics for sensors, memories, and robotic applications. Single crystals of a super‐ and ferroelastic organic semiconductor were harnessed to fabricate ultraflexible single‐crystal electronic devices. At a strain greater than 13 %, the charge carrier mobility of the 6,13‐bis(triisopropylsilylethynyl)pentacene crystals remains above 70 % of that of the unstrained crystal because of mechanically induced cooperative structural transitions.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202004083