Bicontinuous oxide heteroepitaxy with enhanced photoconductivity

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Chemistry

Background:

• Self-assembled systems offer diverse morphologies in nanocomposites.
• Bicontinuous structures are desirable for their high interface-to-volume ratio and 3D interconnectivity.

Purpose of the Study:

• To fabricate and characterize tuneable self-assembled bicontinuous nickel oxide (NiO) and tin dioxide (SnO2) nanocomposites.
• To investigate the formation mechanisms and thermodynamic parameters governing microstructure evolution.
• To evaluate the photovoltaic properties of these novel nanocomposites.

Main Methods:

• Controlled fabrication of NiO:SnO2 nanocomposites with varying concentrations.
• Transmission Electron Microscopy (TEM) with Energy-Dispersive X-ray Spectroscopy (EDX) for compositional analysis.
• First-principles calculations and phase-field simulations for understanding growth modes and microstructure formation.

Main Results:

• Tuneable self-assembled nanostructures, from pillars to bicontinuous, were successfully fabricated.
• Experimental observations of growth modes align with theoretical predictions.
• Phase-field simulations provided insights into 3D microstructure formation and thermodynamic parameters.
• Significantly enhanced photovoltaic properties were demonstrated in the bicontinuous SnO2:NiO nanocomposite.

Conclusions:

• A pathway to developing innovative solar cell and photodetector devices using self-assembled oxides is established.
• The study highlights the potential of bicontinuous NiO:SnO2 nanocomposites for optoelectronic applications.
• Understanding and controlling self-assembly in oxide nanocomposites is crucial for advanced material design.