TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The dielectric material is a spin-onglass material. The photovoltaic cell comprises: one or more hydrogenated amorphous silicon layers; and one or more hydrogenated microcrystalline or hydrogenated nanocrystalline silicon layers. The photovoltaic cell further comprises a back contact electrode comprising aluminum, tin oxide or zinc oxide; a photovoltaic module semiconductor disposed on the back contact electrode, where the photovoltaic module semiconductor comprises one or more hydrogenated amorphous silicon layers and one or more hydrogenated microcrystalline or hydrogenated nanocrystalline silicon layers. The photovoltaic cell further comprises a front contact electrode disposed on the photovoltaic module semiconductor. The front contact electrode is a transparent conductive oxide layer. The front contact electrode comprises tin oxide or zinc oxide. In the photovoltaic cell, (I) comprising one or more colloidal metal nanoparticles, is disposed on the substantially transparent substrate of the photovoltaic cell, opposite the front contact electrode. The disposing a photovoltaic module semiconductor comprises disposing one or more hydrogenated amorphous silicon layers and one or more hydrogenated microcrystalline or hydrogenated nanocrystalline silicon layers.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: (I) comprises a dielectric material encapsulating the colloidal metal nanoparticles. (I) further comprises one or more fluorescent nanoparticles. (I) comprises a single layer comprising the colloidal metal nanoparticles and the fluorescent nanoparticles. (I) comprises at least two layers, where the colloidal metal nanoparticles and the fluorescent nanoparticles are in separate layers. (I) further comprises a substantially transparent substrate disposed on the composition of colloidal nanoparticles. (I) comprises silver (Ag) colloidal nanoparticles and zinc-tellurium (ZnTe) or cadmium-selenium (CdSe) nanoparticles. Preferred Method: The step of disposing comprises disposing the colloidal metal nanoparticles with one or more ligands associated with each nanoparticle, and curing the ligand following the disposing in (b), to generate a dielectric shell surrounding each nanoparticle. The step (e1) comprises disposing a composition comprising colloidal metal nanoparticles: encapsulated in a dielectric material; or in spin-on glass dielectric material. The step (e1) comprises providing the colloidal metal nanoparticles with one or more ligands associated with each nanoparticle, and curing the ligand following the disposing in (e1), to generate a dielectric shell surrounding each nanoparticle. Preferred Components: The colloidal metal nanoparticles comprise silver (Ag) (preferred), gold (Au), copper (Cu) or aluminum (Al). The colloidal metal nanoparticles are 50-800 (preferably 200-800) nm in size. The colloidal metal nanoparticles are spherical, hemispherical, cylindrical or disk-shaped. The fluorescent nanoparticles are cadmium-selenium (CdSe), zinc-selenium (ZnSe), zinc-tellurium (ZnTe) or indium-phosphorus (InP) nanoparticles. The fluorescent nanoparticles comprise a core comprising CdSe, ZnSe, ZnTe or InP, and a shell comprising zinc sulfide (ZnS) or cadmium sulfide (CdS) surrounding the core. The core is doped with manganese (Mn) or copper (Cu). The core has a size of 1-6 nm, and the shell has a thickness of less than 2 nm or 1-10 degrees A in thickness. The transparent substrate comprises glass. The photovoltaic cell comprises one or more hydrogenated amorphous silicon layers. The interfaces between the hydrogenated amorphous silicon layers are substantially non-textured. The interfaces between the hydrogenated amorphous silicon layers, and interfaces between the one or more hydrogenated microcrystalline or hydrogenated nanocrystalline silicon layers, are substantially non-textured. The interfaces between the hydrogenated amorphous silicon layers, interfaces between the one or more hydrogenated microcrystalline or hydrogenated nanocrystalline silicon layers, and interfaces between the hydrogenated silicon layers and an electrode of the photovoltaic cell, are substantially nontextured. The interfaces between the hydrogenated amorphous silicon layers, and interfaces between the hydrogenated amorphous silicon layers and an electrode of the photovoltaic cell, are substantially non-textured. The disposing one or more hydrogenated amorphous silicon layers does not comprise texturing a surface of the silicon layers; or the disposing one or more hydrogenated amorphous silicon layers, and the one or more hydrogenated microcrystalline or hydrogenated nanocrystalline silicon layers does not comprise texturing a surface of the silicon layers. EXAMPLE - None given.