Details

Autor(en) / Beteiligte

• Aggrey, Patrick
• Salimon, Igor A.
• Salimon, Alexey I.
• Somov, Pavel
• Statnik, Eugene
• Zherebtsov, Dmitry
• Korsunsky, Alexander M.

Titel

Tunable broadband absorption in continuous and porous textured Si/C bilayers: A comparative study

Ist Teil von

• Optical materials, 2022-11, Vol.133, p.113048, Article 113048

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Effective light scattering, transmission and absorption play a pivotal role in optical devices. Significant progress has been recorded in this area via the application of surface texturing techniques and photo-friendly thin film coatings. Combining two facile and environmentally safe synthesis processes, a textured silicon (Si)/amorphous carbon (a-C) nanocomposite coating was formed on single crystal silicon substrates. A high purity silicon coating with the average thickness of 17 μm was formed via in situ magnesiothermic reduction reaction (MRR) of diatomaceous earth (DE) and spherical nanosilica at 750 °C and followed by a facile phase separation between polyacrylonitrile (PAN)/tetraethyl orthosilicate (TEOS) to create a porous a-C film. The porous/continuous PAN thin films were subsequently carbonized at 850 °C resulting in a textured Si/a-C film nanocomposite. Unlike polished or textured silicon surfaces, the a-C coated textured silicon surface showed high broadband absorption in excess of 60% in the range 300–1700 nm that compares well with most textured surfaces reported recently in the literature, and benefits from a facile and eco-friendly fabrication approach. [Display omitted] •Mg2Si formation is crucial for synthesizing textured silicon coatings.•High absorption of textured silicon coating is restricted to the visible spectral range.•Tunable porosity induces anti-reflective ability of carbon upper layer.•Broadband absorption achieved in nanostructured silicon coating with amorphous carbon upper layer.•Synergy between total internal reflection and refractive index promotes broadband absorption.