Plasmon‐Enhanced Silicon Nanowire Array‐Based Hybrid Heterojunction Solar Cells

In the last decade, freestanding, single crystal silicon nanowires (SiNWs) have attracted significant attention as a potential material for low‐cost optoelectronic devices. In this paper, we demonstrate how strong localized surface plasmon modes, induced using silver nanoparticles, can be used to achieve significant improvement in a simple hybrid organic–inorganic photovoltaic device between n‐type silicon nanowires and poly(3,4‐ethylenedioxythiophene):poly‐(styrenesulfonate) (PEDOT:PSS). At photon energies above plasmon resonance, metallic nanoparticle‐induced absorption leads to a dramatic reduction of the reflectivity and we report a significant improvement in both the short circuit current density ( J sc ) and the open circuit voltage ( V oc ). This leads to an overall 52% increase in the power conversion efficiencies (PCEs) of the photovoltaic devices when decorating the SiNWs with silver nanoparticles prior to PEDOT:PSS deposition.