Quantum confinement dominates band gaps while defects lead the photoluminescence in silicon nanowires.

Aarti Diwan, Tharun J, Chandeep Ec, Anand Mohan Shrivastav, Tulika Srivastava, Rajesh Kumar, Shailendra K Saxena

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Article in RSC advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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7 authors.

Aarti DiwanOptics and Nanoelectronics Laboratory (ONE), Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India shailens@srmist.edu.in.

Tharun JOptics and Nanoelectronics Laboratory (ONE), Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India shailens@srmist.edu.in.

Chandeep EcOptics and Nanoelectronics Laboratory (ONE), Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India shailens@srmist.edu.in.

Anand Mohan ShrivastavOptics and Nanoelectronics Laboratory (ONE), Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India shailens@srmist.edu.in.

Tulika SrivastavaDepartment of Electronics & Communication, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Chennai 603203 India tulikas@srmist.edu.in.

Rajesh KumarMaterials and Device Laboratory, Department of Physics, Indian Institute of Technology Simrol Indore India 453552.ORCID https://orcid.org/0000-0001-7977-986X

Shailendra K SaxenaOptics and Nanoelectronics Laboratory (ONE), Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India shailens@srmist.edu.in.ORCID https://orcid.org/0000-0001-7156-3407

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The quantum confinement effect has been observed in silicon nanowires (SiNWs) and is a widely accepted mechanism for visible photoluminescence (PL). Besides the observed widening of the band gap, an increase in Urbach energy is seen, revealing the presence of structural disorder due to oxygen-related defects. Surprisingly, in contrast to band gap widening, PL spectra showed a spectral shift instead of peak widening. Our finding indicates that oxygen-related defect states have a significant influence on the shifts in PL peaks. The combined influence of the quantum confinement effect and these defect states is demonstrated to play an important role in defining the PL response. This work provides insights into the interplay between quantum confinement and defect states, offering a clearer understanding of PL mechanisms in SiNWs.

Identifiers

PMID42164283

DOI10.1039/d6ra01273f

PMCPMC13185705

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