V. Schütz
J. Koch
O. Suttmann
L. Overmeyer

Investigations on repetition rate and laser wavelength for efficient generation of black silicon solar cells

International Conference on Sustainable Design and Manufacturing (SDM)
28.-30. April
Type: Konferenzbeitrag
Ultra-short pulsed laser radiation applied on silicon decreases the reflectivity by modifying the surface topology by ablation to achieve a so called “black silicon” texture. A multitude of laser processing parameters are investigated in order to classify the reflectivity reduction. Exemplarily, 5-inch mc-silicon solar wafers are machined in a first step with high throughput using a linear 7-foci diffractive optical element (DOE). In a second step, solar cells are built up to determine the efficiency gain by the laser surface modification. A preliminary absolute efficiency gain of Δη > 0.2 \% is achieved at an absolute reflectivity reduction of globally 11.2 \% in comparison to a conventional isotexture.