Premium
Omnidirectional Strain‐Independent Organic Transistors Integrated onto an Elastomer Template with a Spontaneously Formed Fingerprint‐Mimicking Microtopography
Author(s) -
Choi Giheon,
Baek Seolhee,
Oh Seungtaek,
Cho Hyewon,
Yoo Heemang,
Choi Yoonseuk,
Choi Hyun Ho,
Lee Hwa Sung
Publication year - 2019
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.201900441
Subject(s) - materials science , elastomer , organic field effect transistor , polydimethylsiloxane , stretchable electronics , flexible electronics , composite material , parylene , conformal coating , polymer , field effect transistor , transistor , optoelectronics , electronics , voltage , coating , electrical engineering , engineering
Here, a stretchable organic field‐effect transistor (OFET) that exhibits constant electrical performance irrespective of the strain direction is demonstrated. The device is integrated onto an elastomer template with randomly oriented wrinkles on its surface; these wrinkles are spontaneously formed because of the differences in the thermal–mechanical properties of the plastic layer and the underlying elastomer. To achieve this microtopography, a relatively hard polymer, Parylene C, is ad‐deposited onto an elastomer blended with polydimethylsiloxane and Ecoflex, resulting in PD‐flex. Consequently, this microtopography offers stable device operations of a dinaphtho[2,3‐b:2′,3′‐ f ]thieno[3,2‐ b ]thiophene OFET array under 5% elongation irrespective of strain direction. Furthermore, the electrical performance is highly stable during 10 000 cycles of uniaxial strain, as verified by negligible modulation of the device's field‐effect mobility, threshold voltage, and drain‐current maximum. This approach allows nonstretchable device components to be relevant to stretchable electronics. More importantly, it is highly compatible to device alignment and provides stability under various kinds of mechanical deformations.