Siemens Solar Gmbh

Konstantin Holdermann

Hans-Josef Schmidt

Adolf M Unzer

A new and improved etching solution and etching method provide wet chemical pyramidal texture etching of (100) silicon surfaces. A uniform and completely pyramidal texture etching of silicon surfaces is achieved with an etching solution including water, an alkaline reagent, and isopropanol together with an aqueous alkaline ethylene glycol solution.

Method for the wet chemical pyramidal texture etching of silicon surfaces

Solar cells made of crystalline are metal coated. Combined front side and rear side metal coating based on a thick-film process is proposed, in which even very fine thick-film conductor track structures are sufficiently reinforced by photo-induced currentless deposition of a metal. Well adhering improved conductor track structures for the front side metal coating can be produced using the simplified process.

Process for the metal coating of solar cells made of crystalline silicon

Solar cell with combined metallization and process for producing the same

A method for manufacturing high-efficiency solar cells from polycrystalline or monocrystalline semiconductor material is disclosed. Backside contacts are printed on with a metal-containing paste and front side contacts are deposited finely-structured photo-induced. To that end, a nickel layer is deposited photo-induced directly on the semiconductor that is uncovered in openings or trenches within a passivation layer on the front side. The front side contact is reinforced by a further metal layer that is likewise produced by currentless deposition.

Growing community of inventors

Offingen, Germany

Konstantin Holdermann