Enhanced light-trapping in laser-crystallised silicon thin-film solar cells on glass by optimised back surface reflectors

摘要

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 SiOx 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), (233 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, Jsc up to 23.3 mA/cm(2) (18.9% enhancement compared to the planar reference cell) is achieved. (C) 2017 Elsevier Ltd. All rights reserved.