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Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers

Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers

Published on: February 8, 2022

Pyrolytic carbon coated black silicon.

Ali Shah¹, Petri Stenberg², Lasse Karvonen¹

¹Department of Micro and Nanosciences, Aalto University, Espoo, P.O. Box 13500, FI-00076, Finland.

Scientific Reports

|May 14, 2016

Summary

Researchers developed a novel black surface by coating black silicon with amorphous pyrolytic carbon. This new material achieves extremely low light reflectance, below 0.5%, across a broad spectral range for advanced optical applications.

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Carbon has historically been a premier black material for various applications.
Black silicon is highly reflective at infrared wavelengths, limiting its use.
Combining materials offers potential for enhanced optical properties.

Purpose of the Study:

To create a superior black surface with ultra-low reflectance over a wide spectral range.
To investigate the conformal coating of black silicon with amorphous pyrolytic carbon.

Main Methods:

Conformal coating of black silicon substrates with amorphous pyrolytic carbon.
Characterization of the optical properties of the resulting composite material.

Main Results:

The developed surface exhibits a reflectance of less than 0.5% from 350 nm to 2000 nm.
Amorphous pyrolytic carbon effectively suppresses the high reflectivity of black silicon in the infrared spectrum.

Conclusions:

The combination of black silicon and amorphous pyrolytic carbon creates an artificial material with exceptionally low, broadband light absorption.
This novel material demonstrates significant potential for applications requiring highly efficient light absorption, such as in optics and thermal management.