NOVELTY - A thick film conductor composition comprises aluminum-containing powder; and amorphous silicon dioxide (below 0.3 wt.%), dispersed in organic medium. The composition further comprises glass frits and silver-containing powder. The glass frit composition is a lead-free glass frit composition. The organic medium comprises a polymeric binder and a volatile organic solvent.    USE - For forming an electrode of a solar cell and in the fabrication of a semiconductor device (claimed).    ADVANTAGE - The amorphous silicon dioxide contributes to significant bow reduction tendency for solar cells thinner than 270 microns and larger than five inches square without significant effect on reducing the electrical performance of the fired solar cell. The addition of glass frit reduces the dusting tendency of the aluminum thick film composition. The compositions provide lower bowing than prior art systems and maintain or improve the electrical performance. The inclusion of the amorphous silicon dioxide leads to a significant reduction of cell deformation or bowing at levels including and below 0.3 wt.% addition for various wafer thicknesses. Additions of amorphous silicon dioxide to aluminum pastes applied to wafers of thickness in the range 170 - 330 microns lead to industry acceptable bowing of less than 1.5 mm on wafers up to and including standard wafers in the range of 5 - 6 inches square. The addition of crystalline silicon dioxide powder does not impact the bowing tendency in the same way at all. The addition of amorphous silicon dioxide renders the layer very friable but does not inhibit the formation of the back surface field so important for the electrical function of the solar cell. The inclusion of a glass composition is designed to reduce dusting of the surface and co-incidentally maintain low deformation or bowing in the fired wafer. Thus, the thick film composition containing the glass frit gives lower bowing properties. The glass frit is a lead-free glass frit, which upon firing undergoes recrystallization or phase separation and liberates a frit with a separated phase that has a lower softening point than the original softening point. The addition of glass frit reduces or eliminates the dusting and transfer of free aluminum or alumina dust to other metallic surfaces so reducing the solderability and adhesion of ribbons tabbed to surface particularly relevant when manufacturers wish to stack fired solar cells.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) forming a solar cell involving screen-printing back-side of a silicon substrate with a thick film conductor composition and firing the printed surface at 500 - 990degreesC;    (2) an electrode; and    (3) a semiconductor device comprising the electrode.    DESCRIPTION OF DRAWING(S) - The figure shows a semiconductor device.    substrate (10)    n-type diffusion layer (20)    aluminum back electrode (61)    silver/aluminum back electrode (71)    silver front electrode. (501)