TECHNOLOGY FOCUS - ELECTRONICS - Preferred Cell: The solar cell conductive feature has a thickness of greater than 5 (preferably greater than 10, especially greater than 25) microns, an aspect ratio of less than 1:1 or up to 20:1, and a resistivity of not greater than 4 (preferably not greater than 2) times the resistivity of the equivalent pure metal, which is resistant to solder leaching; and it comprises a set of finger lines and collector lines deposited essentially at a right angle to the finger lines; a transparent conductive feature; indium-tin oxide or antimony-tin oxide; and a metal-glass composition. Either or both the parallel finger lines or the collector lines have width of less than 200 (preferably less than 100) microns.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The direct printing involves syringe printing, aerosol printing or ink jet printing. The heating involves heating the precursor composition to not greater than 300degreesC (preferably not greater than 225degreesC, especially not greater than 185degreesC) to form the solar cell conductive feature on the substrate. The heating sinters adjacent particles to one another. The process further involves high shear mixing the precursor composition; and surface modifying the substrate with a laser. Preferred Composition: The precursor composition has a viscosity of not greater than 20 centipoise, and it further comprises metal oxide particles, glass particles, lead borosilicate glass, or a low melting glass. Preferred Substrate: The substrate has a softening point of not greater than 225degreesC, and it comprises a ceramics or a polymer. Preferred Components: The metallic particles have a volume median particle size of not greater than 100 nanometers or 0.3 microns. The metallic particle comprises a cap or coating on it. The cap or coating comprises an inorganic cap or coating (preferably silica).    TECHNOLOGY FOCUS - METALLURGY - Preferred Metal: The metal is selected from silver, palladium, copper, gold, platinum or nickel.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The cap or coating comprises an organic cap or coating (preferably sodium bis(2-ethylhexyl)sulfosuccinate, tetra-n-octyl-ammonium bromide or alkane thiolate).    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The cap or coating comprises a polymer (preferably intrinsically conductive polymer, a sulfonated perfluorohydrocarbon polymer, polystyrene, polystyrene/methacrylate or PVP (polyvinylpyrrolidone).