Simulation and experimental study of a novel bifacial structure of silicon heterojunction solar cell for high efficiency and low cost

摘要

A novel structure of Ag grid/SiNx+-c-Si-c-Si/i-a-Si∶H/p+-a-Si∶H/TCO/Ag grid was designed to increase the efficiency of bifacial amorphous/crystalline silicon-based solar cells and reduce the rear material consumption and production cost.The simulation results show that the new structure obtains higher efficiency compared with the typical bifacial amorphous/crystalline silicon-based solar cell because of an increase in the short-circuit current (Jsc),while retaining the advantages of a high open-circuit voltage,low temperature coefficient,and good weak-light performance.Moreover,real cells composed of the novel structure with dimensions of 75 mm × 75 mm were fabricated by a special fabrication recipe based on industrial processes.Without parameter optimization,the cell efficiency reached 21.1％ with the Jsc of 41.7 mA/cm2.In addition,the novel structure attained 28.55％ potential conversion efficiency under an illumination of AM 1.5 G,100 mW/cm2.We conclude that the configuration of the Ag grid/SiNx+-c-Si-c-Si/i-a-Si∶H/p+-a-Si∶H/TCO/Ag grid is a promising structure for high efficiency and low cost.