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A new back-reflector architecture for light-management in thin-film solar cells is proposed that includes a morphologically smooth top surface with light-scattering microstructures buried within. The microstructures are pyramid shaped, fabricated on a planar reflector using TiO2 nanoparticles and subsequently covered with a layer of Si nanoparticles to obtain a flattened top surface, thus enabling growth of good quality thin-film solar cells. The optical properties of this back-reflector show high broadband haze parameter and wide angular distribution of diffuse light-scattering. The n–i–p amorphous silicon thin-film solar cells grown on such a back-reflector show enhanced light absorption resulting in improved external quantum efficiency. The benefit of the light trapping in those solar cells is evidenced by the gains in short-circuit current density and efficiency up to 15.6% and 19.3% respectively, compared to the …
Royal Society of Chemistry
Publication date: 
1 Jan 2016

Derese Desta, Sanjay K Ram, Rita Rizzoli, Michele Bellettato, Caterina Summonte, Bjarke R Jeppesen, Pia B Jensen, Yao-Chung Tsao, Hartmut Wiggers, Rui N Pereira, Peter Balling, Arne Nylandsted Larsen

Biblio References: 
Volume: 8 Issue: 23 Pages: 12035-12046