(DE4143408-A1)      No further information has been published for this application.    (US5288338-A)      A solar cell having a Si substrate with a second conductivity type Si layer deposited on one surface in a plasma process which consumes an oxide film not more than 2 nm thick formed on the surface prior to deposition. A transparent electrode layer is deposited on the second conductivity type layer followed by a grid electrode structure. A second electrode is located on the other substrate surface.    ADVANTAGE -   The tandem cell structure gives an enhanced output with conversion maintained over a wide wavelength range. The cell is provided using low cost processes and without the need for photolithography.    (DE4143408-C2)      This method of producing solar cells consists of the following steps. A silicium oxide layer (2) of the required thickness is formed on the surface of a silicium substrate (1) of a first conducting type (n) by submerging the substrate in heated nitric acid.    Then, a microcrystalline or an amorphous silicium layer (3) of a second conducting type (p) is formed on the silicium oxide layer.    USE/ADVANTAGE -   Suitable for solar cell energy installations. The thickness of the boundary layer between the crystalline and the amorphous silicium has been reduced and other characteristics improved.    (DE4116695-C2)      The tandem solar cell described has a silicium substrate (1) of a first conducting type (u), a silicium oxide layer (2) of the required thickness on the substrate, a microcrystalline or amorphous silicium layer (3) of a second conducting type (p) on the silicium oxide layer, a microcrystalline silicium layer (7) of the first type (u) on the microcrystalline or amorphous silicium layer, an amorphous silicium layer (8) of an inversion type (i) on the silicium layer (7), a microcrystalline silicium layer (3a) of the second type (p) on layer (8), a transparent electrode (4) on layer (3a), a comb or lattice electrode (5) on the transparent electrode, and a rear-sided electrode(6) on the rear or back surface of the substrate.$    USE/ADVANTAGE -   Suitable for solar cell designs and solar energy installations. There is an improvement in the idling voltage, short-circuit current and other characteristics.