Nanostructured SnO2-Ge Multi-layer thin Films with Quantum Confinement Effects for Solar Cell

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Nanostructured multi-layer thin films offer novel properties through interfacial phenomena and quantum confinement.
• These films are crucial for optoelectronics, especially photovoltaics, due to structure-dependent optical and electrical characteristics.
• Quantum confinement effects and band gap engineering are key features of these nanostructured films.

Purpose of the Study:

• To investigate the structural and optical properties of nanostructured SnO2-Ge multi-layer thin films.
• To evaluate the impact of varying the number of layers on these properties.
• To assess the potential of these films for photovoltaic applications.

Main Methods:

• Fabrication of SnO2-Ge multi-layer thin films using electron beam evaporation and resistive heating.
• Deposition on glass substrates at 300°C for uniform and homogeneous film growth.
• Characterization using Rutherford Backscattering Spectroscopy (RBS), Raman spectroscopy, and UV-VIS-NIR spectroscopy.

Main Results:

• RBS confirmed the effective formation of the multi-layer structure.
• Raman spectroscopy indicated nanostructures and quantum confinement effects through peak shifts.
• UV-VIS-NIR spectroscopy showed increased band gap energy and a shift in transmittance curves with more layers (Ge: 0.9-1.2 eV, SnO2: 1.7-2.1 eV).

Conclusions:

• The nanostructured SnO2-Ge multi-layer thin films exhibit quantum confinement effects, suitable for heterojunction applications.
• These films demonstrate potential for use in photovoltaic devices.
• Relevant patents in the field have been reviewed and cited.