  Light-trapping mechanisms with plasmonics are an excellent way to increase
the efficiency of photovoltaics. Plasmonic dimer-shaped nanoparticles are
effective in light absorption and scatterings, and there is hardly any research
on dimer TiN nanoparticle-based PV. This paper demonstrated that titanium
nitride could be a suitable substitute for other plasmonic materials in the
visible and near-infrared spectrum. We designed a TiN-based spherical dimer
plasmonic nanoparticle for photovoltaic applications. We conducted comparison
analyses with the metals Ag, Au, and Al to ascertain the performance of TiN as
a plasmonic material. Silicon had an average absorption power of ~19%, and
after incorporating TiN nanoparticles, the average absorbed power increased
significantly to ~75% over the whole spectral range. TiN dimer nanoparticle had
the highest absorption cross-section, Qab value ~6.2 W/m^2 greater than Ag, Au,
and Al had a fraction of light scattered into the substrate value greater than
Au, Al and comparable to Ag. TiN dimer exhibited better absorption enhancement,
g for the whole spectral range than Ag, Au, and Al dimers for a radius of 15 nm
with a peak value greater than 1. The maximum optical absorption efficiency of
the plasmonic TiN nanostructures was ~35.46%.
