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Investigations on Optical Absorption and the Pyro-phototronic Effect with Selectively Patterned Black Silicon for
Charumathi Nataraj1, Kallol Mohanta2, Geetha Priyadarshini Badhirappan1
1Nanostructured Surfaces and Thin Films Laboratory, Department of Physics, PSG Institute of Advanced Studies, Peelamedu, Coimbatore, Tamil Nadu 641004, India.
ACS Applied Materials & Interfaces
|April 25, 2024
Summary
Researchers developed a new stain-etching technique for silicon wafer texturization, eliminating expensive masks. This method enhances photodetector efficiency and reduces electrical losses, offering a promising alternative for optoelectronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Traditional silicon wafer texturization often requires expensive etchant masks.
- Developing cost-effective and efficient texturization methods is crucial for advanced optoelectronic devices.
Purpose of the Study:
- To identify a novel property in stain-etching for maskless texturization of silicon wafers.
- To investigate the optical and electrical properties of selectively patterned silicon substrates.
- To evaluate the performance of microwell-patterned photodetectors.
Main Methods:
- Combined grayscale lithography with stain-etching using AR-P 3510 T photoresist.
- Fabricated nine different patterns with feature sizes from 400 to 1500 μm.
- Analyzed optical properties using diffuse reflectance spectroscopy and finite-difference time-domain simulations.
Main Results:
- Achieved selective silicon patterning without expensive masks.
- Demonstrated improved optical properties and reduced electrical losses in microwell-patterned devices.
- Observed a significant enhancement in the pyro-phototronic effect.
Conclusions:
- The novel stain-etching technique offers a cost-effective alternative for silicon wafer texturization.
- Selectively patterned microwell photodetectors exhibit superior performance compared to planar and black silicon devices.
- This approach provides a new route for fabricating high-performance optoelectronic devices with significantly higher detectivity.
