Structuring Technology and Simulation of High Efficiency Back-Contact Back-Junction Silicon Solar Cells Under Low Concentration

摘要

Industrially feasible structuring techniques as screen-printing and inkjet are investigated with regard to the minimal feature size that can be reached on back-contact back-junction silicon solar cells. The two received different pitches and all further parameters as e.g. diffusion profiles and surface recombination velocities are used as input parameters for the simulation program Sentaurus Device in order to calculate the cell parameters. The smallest pitch that can be processed only with screen-printing technology and a ratio of emitter to back surface field of at least 1.5 (2 mm) and theoretically allows efficiencies of 21% at a concentration of 5 suns. With inkjet structuring technologies structure sizes of about 10 μm and an alignment accuracy of 13.8 μm the pitch can be reduced to 500 jam which results in a possible cell performance of 23.2% under 5 suns.