LAUSR

Abstract This paper presents enhanced light-trapping (LT) in liquid-phase crystallised silicon (LPC Si) thin-film solar cells on glass superstrate by optimised back surface reflectors (BSRs). In the LPC Si film on SiO x buffer layer (without anti-reflection effect), the white paint BSR is found to increase the long wavelengths light absorption, with potential short-circuit current density (J sc ) of 23.6 mA/cm 2 (15.7% enhancement, compared to the planar reference film). Ag plasmonic nanoparticles (NPs) reflector with surface coverage of 47.9% and average diameter of 196.3 nm shows almost similar absorption enhancement as the white paint but with slightly lower potential J sc (23.3 mA/cm 2 , or 14.2% enhancement). In the LPC Si solar cells, the average open-circuit voltage (V oc ) and pseudo fill factor (pFF) are not deteriorated by the presence of the Ag NPs on the Si surface. When combining the Ag NPs, white paint and anti-reflection foil, J sc up to 23.3 mA/cm 2 (18.9% enhancement compared to the planar reference cell) is achieved.