NOVELTY - A composition comprises (wt.%) a) metal powder (30-98); b) glass frit (0.1-15); c) zinc oxide (0.1-8); d) a binder (1-10) e.g. cellulose derivatives, tragacanth gum, gum arabic, xantham gum, lignosulfonates, casein, alginates, acylglycerides, polyvinylpyrrolidone, poly(2-ethyl-2-oxazoline), polyvinyl alcohols, poly(acrylic acid), copolymers of acrylic acid that are soluble in water, poly(ethylene oxide), poly(propylene oxide), copolymers of ethylene oxide and propylene oxide, and latex emulsions selected from acrylic, acrylic-styrene, vinyl-acrylic, or urethane-acrylic; and e) water.    USE - As composition for printing by extruding a metalized fiber on a substrate (where the substrate is silicon wafer, solar cell or photovoltaic module); for extruding a fiber of the composition on the front surface of solar cells (claimed).    ADVANTAGE - The composition produces high aspect ratio (height to width) grid lines with a height greater than 12 microns and width less than 120 microns. The printing method is non-contact, which prints narrow grid line with high aspect ratio. In the method, the grid lines can be extruded directly with a solvent-based paste without using sacrificial barriers or walls to support the silver line. The process is simple and inexpensive, which consequently reduces the printer investment and manufacturing cost of photovoltaic cells and modules. Water is used (as the most preferred solvent) to further lower cost and to ease environmental concerns. The composition is capable of producing grid lines having a high aspect ratio which improves cell efficiency. The narrow grid lines with heights greater than 12 microns produce a line with a cross sectional area large enough to provide electrical conductivity for the solar cell.    DETAILED DESCRIPTION - A composition (C1) comprises (wt.%): a) metal powder (30-98); b) glass frit (0.1-15); c) zinc oxide (0.1-8); d) a binder (1-10) selected from cellulose derivatives (preferably methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl ethyl cellulose, hydroxyethyl cellulose, 2-hydroxyethyl cellulose, and hydroxypropyl cellulose), cellulose ethers, cellulose acetates, tragacanth gum, gum arabic, cyamoposis gum, gum dammer, locust bean gum, xantham gum, lignosulfonates, casein, alginates, acylglycerides, polyvinylpyrrolidone, poly(vinyl pyrrolidone-vinyl acetate), poly(2-ethyl-2-oxazoline), polyvinyl alcohols, poly(acrylic acid), copolymers of acrylic acid that are soluble in water, poly(ethylene oxide), poly(propylene oxide), copolymers of ethylene oxide and propylene oxide, and latex emulsions selected from acrylic, acrylic-styrene, vinyl-acrylic, or urethane-acrylic; and e) water (10-50); and a composition (C2) comprises (wt.%): (a) (30-98), (b) (0.1-15), (c) (0.1-8); d1) a binder (1-10) selected from poly(vinyl acetate), poly(vinyl acetate-carbon monoxide-ethylene), poly(n-butyl acrylate-glycidyl methacrylate), poly(ethylene-vinyl acetate), poly(vinyl butyral-vinyl alcohol-vinyl acetate), poly(vinylidene fluoride), poly(ethylene-tetrafluoroethylene), copolymers of vinylidene difluoride, fluoropolymers, poly(acrylonitrile), poly(oxymethylene), poly(ethylene terephthalate), poly(ethylene methacrylic acid), poly(ethylene acrylic acid), poly(ethylene vinyl alcohol), poly(organosiloxane) polyurethanes, polyethers, polyesters, polycarbonates, polyamides, epoxy resins, and phenolic resins; and e1) organic solvent (10-50). INDEPENDENT CLAIMS are included for the following:    (1) a process (P1) involving fabricating the composition (C1) or (C2) into a fiber, depositing the fiber on a substrate, removing the solvent, and firing the substrate;    (2) a solar cell (S1) comprising a pattern of fibers of the composition on a light-exposable surface, where the fibers have a height greater than 12 microns and a width less than 120 microns (after firing process); and    (3) a solar cell (S2) comprising a pattern of fibers made using the process (P1) on a light-exposable surface, where the silver lines have a height greater than 12 microns and a width less than 120 microns (after firing process).    DESCRIPTION OF DRAWING(S) - The figure shows a cross-section view of the wafer solar cell (p-type wafer) before a firing process.