TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The grid material (GM) of the supporting element (SE) is a self-supporting grating electrode (18) of a photovoltaic element (10), and the coating material (VCM) is a photovoltaically active laminate (16) of the photovoltaic element. The active laminate specifically comprises hole blocker layer(s) (24) (preferably of titanium oxide), electron blocker layer(s) (34) (preferably of poly-(3,4-ethylenedioxy-thiophene)-poly-(styrenesulfonate) (PEDOT-PSS)) and semiconductor layer(s) (32) (preferably containing an electron donor and an electron acceptor, especially a mixture of fullerene (PCBM) and poly-(3-hexyl-thiophene) (P3HT), especially in ratio 0.5-2:2-0.5). A counter-electrode is provided in the laminate, specifically in opaque partial area or transparent whole area form and preferably consisting of metal layer(s) (especially a set of different metal layer) or of indium-tin oxide (ITO).    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The sheet structure is a photovoltaic element component, including electron blocker layer(s) of poly-(3,4-ethylenedioxy-thiophene)-poly-(styrenesulfonate) (PEDOT-PSS)) and semiconductor layer(s) of a mixture of fullerene (PCBM) and poly-(3-hexyl-thiophene) (P3HT).    TECHNOLOGY FOCUS - TEXTILES AND PAPER - Preferred Structure: The grating material (GM) is a metal wire fabric (optionally having a cleaned, roughened and/or coated surface and/or a surface structure, specifically a trough, line and/or prism structure) or a textile fabric (preferably at least partially metallized), and is applied to a rigid or flexibly deformable base sheet element. The lattice openings of the GM have the same size or different sizes, the lattice spacings being constant in both spatial directions and same or different in the two spatial directions. The wires of a metal wire fabric GM are of a single material or of different (or differently coated) materials, specifically having different electrical conductivity or wire diameter; in particular the GM may be electrically conductive in one spatial direction and insulating in the other. At least one layer of GM is present, the SE especially consisting of a stack of GM layers. EXAMPLE - No relevant example given.