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SnO2 nanowire logic devices on deformable nonplanar substrates.

Gunchul Shin¹, Min Young Bae, Hyun Jin Lee

¹Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Korea.

|November 17, 2011

Summary

Researchers developed flexible electronic devices using tin oxide (SnO2) nanowires on a stretchable elastomer. These devices maintain electrical performance even when deformed into complex, non-planar shapes, enabling new applications in medical implants and robotics.

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Area of Science:

Materials Science
Nanotechnology
Electronics Engineering

Background:

Fabrication of flexible electronics often faces challenges with maintaining performance under mechanical strain.
Integrating electronic components onto non-planar or dynamically deforming surfaces requires novel material and design approaches.

Purpose of the Study:

To demonstrate the fabrication and performance of logic inverters based on tin oxide (SnO2) nanowires on a prestrained elastomer.
To investigate the ability of these nanowire devices to withstand and recover from significant mechanical deformation without compromising electrical characteristics.

Main Methods:

Logic inverters were fabricated using n-type field-effect transistors (FETs) and resistors with SnO2 nanowire channels on polydimethylsiloxane (PDMS) elastomer films.

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The PDMS films were prestrained, flattened, and then released, inducing buckling in interconnects to accommodate strain and allow surface recovery.

Electrical performance was measured under various deformations, including convex, concave, and complex non-planar shapes, with air gap gate dielectrics utilized.

Main Results:

The fabricated SnO2 nanowire logic inverters demonstrated stable electrical performance despite significant, reversible mechanical deformations.
Interconnects between devices buckled into sinusoidal shapes, enabling the elastomer surfaces to return to their original geometries without damaging the electronics.
The use of air gap gate dielectrics enhanced the electrical performance of the devices under strain.

Conclusions:

Nanowire devices, including those with unconventional designs, can be integrated into flexible systems with irregular, non-planar layouts that undergo reversible deformation without electrical degradation.
This technology holds promise for applications in tissue-matched implantable electronics and sensor skins for robotics.
The study highlights the potential of nanowire-based electronics for conformable and stretchable systems.