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Laser microstructured metal thin films as promising alternative for indium based transparent electrodes
Optics Express
|May 4, 2016
Summary
Researchers explored copper and aluminum thin films as alternatives to indium-tin-oxide for transparent electrodes. Laser structuring improved optical properties like transmittance and haze with minimal impact on electrical resistance.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Indium-tin-oxide (ITO) is a standard transparent conductive material.
- There is a need for alternative materials due to ITO's cost and brittleness.
- Thin films of copper and aluminum are investigated for transparent electrode applications.
Purpose of the Study:
- To structure copper and aluminum thin films for tailored optical properties.
- To evaluate the impact of laser processing on film performance.
- To assess these materials as potential replacements for ITO.
Main Methods:
- Thin films of copper and aluminum (5-40 nm) were fabricated.
- Direct Laser Interference Patterning (DLIP) was used to create micrometer-scale holes.
- Optical and electrical parameters of nanosecond (ns) and picosecond (ps) laser-processed films were compared.
Main Results:
- Optical transmittance increased by 25-125% after structuring.
- Electrical resistance was only marginally affected by the laser treatment.
- The diffuse to total transmission ratio (HAZE) improved by 30-82%.
Conclusions:
- Structured copper and aluminum thin films show promise as alternatives to ITO.
- DLIP effectively enhances optical properties while maintaining electrical integrity.
- The results demonstrate the feasibility of using these metals for transparent electrode applications.
