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Can nano silicon be made optically active?

Roby Cherian¹, Ashis Kumar Nandy, Priya Mahadevan

¹Unit for Nanoscience and Technology and Advanced Materials Research Unit, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India.

Journal of Nanoscience and Nanotechnology

|November 26, 2009

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Researchers explored methods to create optically active silicon nanocrystals. Modifying nanocrystal shape influences properties, yielding slightly optically active nano silicon, a key step towards advanced silicon materials.

Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Silicon is a crucial semiconductor with extensive applications.
Efforts are ongoing to enhance silicon's optical properties for advanced devices.
Controlling silicon at the nanoscale is key to unlocking new functionalities.

Purpose of the Study:

To investigate methods for generating silicon nanocrystals from bulk fragments.
To explore the relationship between nanocrystal shape, physical properties, and optical activity.
To determine if silicon can be rendered optically active through nanocrystal engineering.

Main Methods:

Two distinct methods were employed to synthesize silicon nanocrystals.
Nanocrystal shape was systematically varied to study its impact on properties.

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Physical and optical properties of silicon nanocrystals were analyzed.

Main Results:

Similar-sized silicon nanocrystals with different shapes exhibited varying band gaps.
The degeneracy of the conduction band minimum was successfully modulated by controlling nanocrystal shape.
The synthesis route resulted in slightly optically active nano silicon.

Conclusions:

Nanocrystal shape engineering is a viable strategy to tune silicon's physical properties.
Modifying the conduction band minimum's degeneracy can induce optical activity in silicon.
This research offers a pathway towards developing optically active silicon nanomaterials.