TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: In the photovoltaic module (M1): the filler material occupies 20-40 wt.% of the first portion of the interlayer (L); the concentration of the filler material in the second portion is less than the concentration of the filler material in the first portion, where the second portion is located at a first side of the interlayer (L); the interlayer (L) further comprises a third portion having a concentration of filler material disposed within the base material that is less than the concentration of filler material in the first portion, where the third portion is located at a second side of the interlayer (L); the concentration of the filler material in the second portion and the third portion is zero; the filler of the second portion of the interlayer (L) is different from the filler of the first portion of the interlayer (L); and the base material comprises at least one material comprising ethylene vinyl acetate (EVA), polyvinyl butyral (PVB), polydimethylsiloxane (PDMS), butyl/polyisobutylene, polyolefin, thermoplastic polyurethane (TPU), polyurethane, epoxy, silicone or ionomer. In the photovoltaic module (M1), the filler material comprises: at least one material comprising halocarbons, aluminum trihydrate (ATH), antimony trioxide, borates, hydrated magnesium carbonate, non-halogenated hindered amines, silicate, clay, nanoclay, calcium oxide, calcium carbonate, solid glass spheres, hollow glass spheres, glass fibers, reclaimed polymers, natural polymer, cellulose, molecular sieves, aluminum oxide (alumina), silica gel, clay, calcium chloride, calcium oxide or calcium sulfate; a flame retardant filler material comprising halocarbons, ATH, antimony trioxide, borates, hydrated magnesium carbonate or non-halogenated hindered amines; an inert filler material comprising silicate, clay, nanoclay, calcium oxide, calcium carbonate, ATH, solid glass spheres, hollow glass spheres, glass fibers, reclaimed polymers, natural polymer or cellulose; and a desiccant filler material comprising molecular sieves, aluminum oxide (alumina), silica gel, clay, calcium chloride, calcium oxide or calcium sulfate. The photovoltaic module (M1) further comprises an adhesive layer arranged between the first portion and the second portion. In the multilayered interlayer (L1): the first filler material occupies 5-95 vol.% of the first layer; the second layer further comprises a second base material and a second filler material disposed within the second base material at a second concentration that is different from the first concentration; the second filler material occupies less than 50 vol.% of the second layer; the first base material and the second base material each comprises at least one material comprising EVA, PVB, PDMS, butyl/polyisobutylene, polyolefin, TPU, polyurethane, epoxy, silicone or ionomer; the first filler material and the second filler material each comprises at least one material comprising halocarbons, ATH, antimony trioxide, borates, hydrated magnesium carbonate, non-halogenated hindered amines, silicate, clay, nanoclay, calcium oxide, calcium carbonate, solid glass spheres, hollow glass spheres, glass fibers, reclaimed polymers, natural polymer, cellulose, a molecular sieve, aluminum oxide (alumina), silica gel, clay, calcium chloride, calcium oxide or calcium sulfate; the second layer does not include a filler material; the interlayer further comprises a third layer comprising a third base material and a third filler material disposed within the third base material at a third concentration that is different from the first concentration, where the first layer is arranged between the second layer and the third layer; the concentration of the filler material in the second layer and the third layer is zero; the filler of the second portion of the interlayer is different from the filler of the first portion of the interlayer; and the first filler material and the second filler material each comprises at least one of a flame retardant material and a desiccant material. The multilayered interlayer (L1) further comprises an adhesive layer arranged between the first portion and the second portion, or between the first layer and the second layer. In the photovoltaic module (M2): the second concentration and the third concentration of the filler material are zero, and less than the first concentration of the filler material; the base material comprises at least one material comprising EVA, PVB, PDMS, butyl/polyisobutylene, polyolefin, TPU, polyurethane, epoxy, silicone or ionomer; and the filler material comprises a flame retardant filler material or a desiccant material. The photovoltaic module (M2) further comprises: a first adhesive layer arranged between the first layer and the second layer; and a second adhesive layer arranged between the first layer and the third layer. In the photovoltaic module (M3) the filler material occupies 1-75 (preferably 20-40) wt.% of the interlayer (L).