Appendices Solar energy Black silicon dry etching – textured surface on multi cell Black silicon wet etching – textured surface on multi cell Source: GCL-Poly Source: GCL-Poly Black silicon texturing Black silicon texturing improve multi cell efficiency by 0.6ppts to 0.7ppts improve multi cell efficiency by 0.6ppts to 0.7ppts Source: GCL-Poly 17 November 2020
[email protected] 201 Appendices Solar energy Appendix 14: Solar tech: Round-shaped ribbon Round-shaped ribbon A thinner, round-shape A thinner, and round-shape ribbon for the MBB rather than a flat ribbon could be ribbon reduces shading and used - this reduces shading and increases the photons hitting the surface of the increases the photons semiconductor. With a round-shape wire, incident light gets reflected at various hitting the surface of the angles, and more light hits the cells. At the same time, according to CPIA, the usage semiconductor of silver paste is reduced significantly for MBB (9BB reduces silver paste usage by 25% versus 5BB), at the same time increasing power output by 2% and reducing micro-cracks. A flat rectangular ribbon blocks light A round-shape ribbon reflects light Source: LG Source: LG 202
[email protected] 17 November 2020 Appendices Solar energy Appendix 15: Solar tech: Half-cut solar cells Half cut solar cell modules Another small tweak to the Another small tweak to the cell-module fabrication technique is half cut cells, which cell-module fabrication is done by cutting a full-size solar cell into two half-size cell with an infrared laser.