NOVELTY - Solar cell comprises adjacent regions of doped semiconductor material forming a pn junction parallel to front and rear surfaces. A dielectric layer (29, 30) is formed on surface of semiconductor material. The dielectric layer is thinner or non-existent in a portion of each depression. A screen printed metal contact structure is formed on dielectric layer and extends into depressions where metal structure makes contact with semiconductor material in the depressions. The dielectric layer extends into the depressions as thinner layer (32) than that part of dielectric layer on outside surface.    USE - For use in photovoltaic field.    ADVANTAGE - The cell demonstrates high fill factors through low resistive losses such as at the contacts, and high dye sensitized photocurrent as a result of the low metal shading losses, low reflection surface, and excellent response to short wavelength light.    DETAILED DESCRIPTION - A solar cell comprises adjacent regions of oppositely doped semiconductor material forming a pn junction parallel to front and rear surfaces of the solar cell. A surface of the semiconductor material has depressions. The semiconductor material regions forming internal wall surface regions (26) of the depressions are doped to the polarity of one of the semiconductor regions of the junction, with which they are in electrical communication, and the wall surface regions are isolated from the other oppositely doped region of the junction. A dielectric layer is formed over the surface of the semiconductor material of the cell. The dielectric layer is thinner or non-existent in a portion of each depression. A screen printed metal contact structure is formed over the dielectric layer and extends into the depressions where the metal structure makes contact with the semiconductor material in the depressions. The dielectric layer extends into the depressions as a thinner layer (32) than that part of dielectric layer on surface outside of the depressions. The depressions comprise grooves or wells (27, 28).    INDEPENDENT CLAIMS are included for:    (a) a method for fabricating a contact structure on a solar cell; and    (b) a method for applying a reagent to a surface of a structure during the formation of a solar cell.    DESCRIPTION OF DRAWING(S) - The figure illustrates the substrate with the surface oxides removed and a nitride layer applied to the surface.    Internal wall surface regions of depressions (25, 26)    Grooves or wells (27, 28)    Dielectric layer (29, 30)    Dielectic material (32)