Polarization dependent solar cell conversion efficiency at oblique incident angles and the corresponding improvement...

Area of Science:

• Photovoltaics and Renewable Energy
• Nanomaterials Science
• Optics and Photonics

Background:

• Solar cell efficiency is typically optimized for normal light incidence, neglecting oblique angles.
• Light absorption and photoresponsivity vary significantly with polarization (transverse magnetic/TM and transverse electric/TE) at oblique angles.
• Addressing angular dependence and polarization effects is crucial for real-world solar energy harvesting.

Purpose of the Study:

• To investigate solar cell performance, including conversion efficiency and photoresponsivity, at various oblique incidence angles.
• To analyze the polarization-dependent light absorption and reflectivity characteristics of solar cells.
• To enhance solar cell efficiency under oblique incidence using surface modification with silica nanoparticles.

Main Methods:

• Characterization of solar cell conversion efficiency and photoresponsivity spectra at different tilted angles.
• Fabrication of a monolayer of silica nanoparticles on the solar cell surface.
• Analysis of light reflectivity and absorption for both transverse electric (TE) and transverse magnetic (TM) polarized light before and after nanoparticle application.

Main Results:

• Transverse magnetic (TM) polarized light showed higher photoresponsivity than transverse electric (TE) polarized light, with the difference increasing at larger incidence angles.
• Silica nanoparticles reduced surface reflectivity for both TE and TM polarized light.
• The interaction between silica nanoparticles and TE polarized light was more significant, leading to improved light absorption and conversion efficiency for obliquely incident light.

Conclusions:

• Silica nanoparticle monolayers effectively enhance solar cell light absorption and conversion efficiency at oblique incidence angles.
• The polarization-dependent interaction of silica nanoparticles with light, stemming from refractive index differences, explains the observed performance improvements.
• This approach offers a viable strategy for optimizing solar cell performance under diverse light conditions, including varying angles and polarizations.