NOVELTY - The solar cell (40B) comprises a substrate having an upper surface, bus bars (45B) extending in a first direction across the upper surface of the substrate, and parallel gridlines (44B-1, 44B-2 44B-3) extending in a second direction across the upper surface of the substrate. The second direction defines an angle with the first direction such that each of the parallel gridlines intersects the bus bars. A first gridline portion and a third gridline portion of each of the gridline are disposed directly on the upper surface of the substrate, and have a cross-sectional shape.    USE - Used as a solar cell.    ADVANTAGE - The solar cell can be economically manufactured with high performance, and avoids the poor soldering problems of the bus bars caused by peaked topography.    DETAILED DESCRIPTION - The solar cell (40B) comprises a substrate having an upper surface, bus bars (45B) extending in a first direction across the upper surface of the substrate, and parallel gridlines (44B-1, 44B-2 44B-3) extending in a second direction across the upper surface of the substrate. The second direction defines an angle with the first direction such that each of the parallel gridlines intersects the bus bars. A first gridline portion and a third gridline portion of each of the gridline are disposed directly on the upper surface of the substrate, and have a cross-sectional shape including a first aspect ratio. A second gridline portion of each gridline is disposed on the bus bars, and has a cross-sectional shape including a second aspect ratio that is lower than the first aspect ratio. The bus bars consist of a first ink having a first chemical composition having a first melting point temperature. Each of the parallel gridlines consists of a second ink having a second chemical composition having a second melting point temperature. The first and second chemical compositions are selected such that contact between the second gridline portions and the bus bars produces a third chemical composition having a third melting point temperature that is lower that the first and second melting point temperatures. The first and/or second inks comprise a colloidal gel. The first and second chemical compositions of the first and second inks comprise a first pH level and a second pH level respectively. The second pH level is different from the first pH level. The third composition comprises a third pH level that is different from the first and second pH levels.    DESCRIPTION OF DRAWING(S) - The diagram shows a perspective side view of a method for producing a solar cell.    Solar cell (40B)    P-type doped lower region (41B)    Gridlines (44B-1, 44B-2 44B-3)    Elevated portions (44B-12, 44B-22, 44B-32)    Bus bar. (45B)