1 research outputs found
Shape-Dependent Light Harvesting of 3D Gold Nanocrystals on Bulk Heterojunction Solar Cells: Plasmonic or Optical Scattering Effect?
In
the work, mechanisms behind various 3D nanocrystals enhanced
performance of bulk heterojunction solar cells were studied comprehensively.
Four types of gold nanoparticles (NPs) with distinctly different shapes
and great uniformity were designed and synthesized, including cubes,
rhombic dodecahedra (RD), edge- and corner-truncated octahedra (ECTO),
and triangular plates, to systematically probe their influences on
photovoltaics. RD and triangular plates show a higher growth rate,
while slower growth favors cubes and ECTO formation by controlling
the reduction agent and capping ion amount. NPs with increasing corners
and proper size of cross-section induce stronger near-field coupling
and far-field scattering in P3HT:PC<sub>61</sub>BM-based active layers.
Both finite-difference time-domain simulation and UV–visible
absorption spectra firmly support that RD exhibit the strongest
localized surface plasmon resonance and optical scattering. With optimized
conditions, a high power conversion efficiency exceeding 4% was reproducibly
achieved