LAUSR

Abstract Multilayer graphene nanomeshes (GNMs) are first employed to improve the efficiency and long-term stability of porous-Si (PSi) Schottky-junction solar cells because GNMs exhibit stable p-type characteristics. Photovoltaic parameters of multilayer GNM/PSi solar cells strongly depend on hole size of GNM (S h ) and number of layers ( L n ). Especially, GNMs are advantageous for efficient separation and collection of photo-induced electron-hole pairs due to their low reflectance and high work function. Optimized maximum power conversion efficiency (PCE) is 7.02% at S h  = 40 nm and L n  = 3, resulting from S h - and L n -dependent trade-off correlation between electrical and optical properties of the GNM/PSi solar cells. The solar cells lose only 1/7% of the initial PCE even under room-temperature atmosphere/continuous light soaking at 60 °C, respectively for 1000 h.