Multi-phase functionalization of titanium for enhanced photon absorption in the vis-NIR region

Area of Science:

• Materials Science
• Photonics
• Renewable Energy

Background:

• Conventional silicon solar cells struggle to absorb near-infrared (NIR) photons, limiting their efficiency.
• NIR photons represent a significant portion of solar energy that is currently untapped.
• Developing materials that enhance NIR absorption is crucial for advancing solar cell technology.

Purpose of the Study:

• To investigate a novel multi-phased titanium oxide for enhanced photon absorption.
• To explore the potential of ultrafast laser synthesis for creating advanced solar materials.
• To improve the efficiency of solar cells by capturing a broader spectrum of light.

Main Methods:

• Synthesis of a multi-phased titanium oxide using a single-step ultrafast laser pulse interaction with pure titanium.
• Characterization of the synthesized material to identify its phases (Ti3O, (TiO0.716)3.76, and TiO2 rutile).
• Measurement and computation of the material's optical properties, including band gap and absorption spectrum.

Main Results:

• A novel multi-phased titanium oxide was successfully synthesized.
• The material exhibited significant absorption in the visible and near-infrared (400-1000 nm) regions.
• Steady absorption in the NIR range (750-1000 nm) was observed, a previously unreported characteristic.
• The average computed band gap of the material is 2.39 eV.

Conclusions:

• The ultrafast laser-induced multi-phased titanium oxide demonstrates exceptional NIR absorption capabilities.
• This material holds significant potential for photon sensitization and the development of full-spectrum solar devices.
• The synthesis method offers a simple and versatile approach for creating advanced photovoltaic materials.