Jan Nievendick, Jan Specht, Martin Zimmer, Lorenz Zahner, William Glover, David Stüwe and Jochen Rentsch
In order to couple more light into solar cells, their surface has to be textured. Usually, multicrystalline solar cells are textured by isotropic acidic etching, resulting in tex-tures with a weighted reflectance between 23% and 30%. However, a lower reflection does not necessarily lead to a higher efficiency because of increased surface roughness. With a honeycomb (HC) structure formed by iso-tropic etching through a mask, the reflectance can be reduced significantly while maintaining a low surface roughness. An industrially applicable approach to create a mask for a HC texture is inkjet printing. In previous publications it was mostly used to open a dielectric layer via inkjet deposition of an etchant. In contrast, Nievendick et al. (pp. 7–9) used a directly printed inkjet mask for HC texturing. Using this method, openings smaller than the droplet size are produced, which make applications for HC texturing possible. In the publication a weighted re-flection of 18.4% was achieved.