OVER 18 INDUSTRIAL SCREEN PRINTED SILICON SOLAR CELLS

摘要

State of the art solar modules in the power range of 160 Wp to 180 Wp are mainly based on screen printed metallization and aluminium back-surface-field, which allow typically cell efficiencies in production of 16 % to 17 % for monocrystalline silicon solar cells. With the aim of about 200 Wp modules advanced cell technologies like boron BSF, blue responsive and locally below the metal contacts selective high doped emitters and fine line metallization have been developed. A major characteristic of this fabrication approach is the simplicity and cost effectiveness of the complete cell fabrication process, which evolved simply by implementation of some additional process steps into the existing screen-printing production process. By application of these technologies solar cell efficiencies well over 18 % have been reached. Best cell efficiencies of 18.8 % were measured immediately after cell fabrication and 18.4 % cell efficiency was confirmed by ISE-CalLab after one month of cell degradation in the dark and without annealing. Industrial size modules of 72 cells were fabricated and reached a power output of 198 Wp, which corresponds to 15 % module efficiency and an average cell efficiency in the module of 17.7 %.