Au decorated direct laser processed black Si for enhanced infrared absorption

Bing Zhao; Xiaona Zhao; Wenhan Du; Xuan Wang

doi:10.1117/12.2691249

16 October 2023 Au decorated direct laser processed black Si for enhanced infrared absorption

Bing Zhao, Xiaona Zhao, Wenhan Du, Xuan Wang

Proceedings Volume 12792, Eighteenth National Conference on Laser Technology and Optoelectronics; 127921B (2023) https://doi.org/10.1117/12.2691249
Event: Eighteenth National Conference on Laser Technology and Optoelectronics, 2023, Shanghai, China

Abstract

An innovative black silicon (Si) with enhanced photoelectric performance was directly processed by femtosecond (fs) laser irradiation in ambient air. Followed by decorated with Au nanoparticles, this processed Si is shown to enhance the light absorption from the surface in a wide wave band, especially in the near-infrared range of 1.1 ~2.5μm, where the absorption of Au decorated black Si (B-Si-Au) nearly reaches to 70%, and displaying double magnitude higher than the bare black Si (B-Si). A systematic investigation of synergy effect between the hierarchical texture and Au NP-induced localized surface plasmon resonance (LSPR) is crucial to upgrade B-Si-Au absorption enhancement. On one hand, the processed microstructures on the Si surface may effectively extend the incident light path and thus provide more chance for the photon perennate into the Si and thus reducing reflection; on the other hand, strong scattered fields in the vicinity of Au nanoparticles generate extremely high intensity hot spots, which in turn lead further enhancement of absorption.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Bing Zhao, Xiaona Zhao, Wenhan Du, and Xuan Wang "Au decorated direct laser processed black Si for enhanced infrared absorption", Proc. SPIE 12792, Eighteenth National Conference on Laser Technology and Optoelectronics, 127921B (16 October 2023); https://doi.org/10.1117/12.2691249

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KEYWORDS

Silicon

Gold

Light absorption

Infrared radiation

Femtosecond phenomena

Reflection

Laser processing

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