NOVELTY - The solar cell comprises a substrate (702) having a surface with ridges and first and second grooves, a first doped region (710) of a first conductivity type disposed in the first grooves (706A), and a second doped region (712) of a second conductivity type that is opposite to the first conductivity type and is disposed in the second grooves (706B), where the first and second grooves are separated by one of the ridges. The ridge separating the first and second grooves comprises an undoped or lightly doped region. The first doped region extends by an amount into the ridge.    USE - Used as a solar cell.    ADVANTAGE - The solar cell can be efficiently and economically fabricated with increased power generation capability.    DETAILED DESCRIPTION - The solar cell comprises a substrate (702) having a surface with ridges and first and second grooves, a first doped region (710) of a first conductivity type disposed in the first grooves (706A), and a second doped region (712) of a second conductivity type that is opposite to the first conductivity type and is disposed in the second grooves (706B), where the first and second grooves are separated by one of the ridges. The ridge separating the first and second grooves comprises an undoped or lightly doped region. The first doped region extends by an amount into the ridge from a first side of the ridge, and the second doped region extends by the same amount into the ridge from a second side of the ridge. The undoped or lightly doped region extends from the first side of the ridge to the second side of the ridge above the portions of the first and second doped regions that extend into the ridge, and is disposed between the portions of the first and second doped regions that extend into the ridge. The ridge separating the first and second grooves further comprises dopants of first conductivity type continuous with the first doped region and contiguous with the second doped region. The solar cell further comprises a semiconductor layer disposed in each of the grooves. The first doped region is further disposed in a portion of the substrate below a surface of the first groove and disposed in the portion of the semiconductor layer disposed in the first groove, and the second doped region is further disposed in another portion of the substrate below a surface of the second groove and disposed in the portion of the semiconductor layer disposed in the second groove The semiconductor layer is conformal with a portion of each groove, and is discontinuous between grooves. An INDEPENDENT CLAIM is included for a method of fabricating a solar cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross-sectional view of a method for fabrication of a solar cell.    Substrate (702)    First groove (706A)    Second groove (706B)    First doped region (710)    Second doped region (712)    Third doped region. (712A)