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Deterministic Line-Shape Programming of Silicon Nanowires for Extremely Stretchable Springs and Electronics
Zhaoguo Xue1, Mei Sun2, Taige Dong1
1National Laboratory of Solid State Microstructures/School of Electronic Science and Engineering/Collaborative Innovation Center of Advanced Microstructures, Nanjing University , 210093 Nanjing, People's Republic of China.
Nano Letters
|December 1, 2017
Summary
Researchers engineered silicon nanowires (SiNWs) into stretchable springs using indium droplets. These superelastic SiNW springs exhibit robust electrical transport even under extreme stretching, paving the way for advanced electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Line-shape engineering enhances the stretchability of one-dimensional silicon nanowires (SiNWs).
- Self-assembly processes are crucial for growing SiNWs with tailored properties.
Purpose of the Study:
- To demonstrate deterministic line-shape programming of in-plane SiNWs into stretchable springs and 2D patterns.
- To investigate the growth mechanism and structural properties of engineered SiNWs.
- To evaluate the mechanical and electrical properties of SiNW springs under stretching.
Main Methods:
- Utilizing indium droplets to absorb amorphous silicon precursor thin films.
- Growing ultralong crystalline silicon nanowires (c-SiNWs) along programmed step edges.
- Employing high-resolution transmission electron microscopy (HRTEM) for structural analysis.
- Conducting in situ scanning electron microscopy (SEM) for mechanical testing and current-voltage characterization.
Main Results:
- Achieved reliable, single-run growth of c-SiNWs over curved tracks with varying local curvatures.
- Confirmed high-quality, monocrystalline structure in line-shaped engineered SiNW springs via HRTEM.
- Demonstrated superelastic and robust electrical transport in SiNW springs under >200% stretching via in situ SEM.
Conclusions:
- The developed line-shape programming approach enables deterministic fabrication of stretchable SiNW structures.
- This method facilitates the creation of ultralong, high-quality c-SiNWs with engineered shapes.
- The findings hold significant promise for integrating mature c-Si technology into next-generation biofriendly and stretchable electronics.
