Köppel, G.; Amkreutz, D.; Sonntag, P.; Yang, G.; van Swaaij, R.; Isabella, O.; Zeman, M.; Rech, B.; Becker, C.: Periodic and Random Substrate Textures for Liquid Phase Crystallized Silicon Thin-Film Solar Cells. IEEE Journal of Photovoltaics 7 (2017), p. 85-90
Open Access Version
A major limitation in current liquid phase crystallized (LPC) silicon thin-film record solar cells are optical losses caused by their planar glass-silicon interface. In this study, silicon is grown on nanoimprinted periodically as well as on randomly textured glass substrates and successfully implemented into state-of-the-art LPC silicon thin-film solar cells. Compared to an optimized planar reference device, both textures enhance absorption of light. Interlayer and process optimization allowed achieving a material quality comparable to the planar reference device. On the random texture an open-circuit voltages above 630 mV was obtained as well as an external quantum efficiency exceeding the planar reference device by +3 mA/cm2.