| As a renewable green energy, the solar cell has incomparable advantages than othertraditional energy. So how to improve the photoelectric conversion efficiency and make fulluse of the solar energy resources have been a research hotspot in battery research field. Usingdouble screen printing to increase grid line thickness was one of the effective methods toimprove the efficiency of solar cells. However, double screen printing had some problemssuch as the precision of grid lines was difficult to control and the grid line extension wasexisted. Therefore people put forward multi-pass ink-jet printing technology with equalvolume drops to improve the aspect ratio of the silicon solar cell grid lines. However, grid lineextension existed every time in inkjet printing within five times like line extension in doublescreen printing, and the final grid line width was about two times of single printing.In order to control metallization grid line width of silicon chip effectively, and not toincrease the cost of printing materials and grid line resistance, this paper had put forwardsmulti-pass ink-jet printing process with variable volume drops according to the law andexperimental data and gained theoretical model of the selection of optimal droplet volume ofmulti-pass inkjet printing. Printing the metal grid of silicon-based solar cell using this processis to improve the energy conversion efficiency of solar cells, mainly by reducing the grid lineswidth of solar cells.This paper has done numerical calculation for the increase of the solar cell efficiencyafter applying multi-pass ink-jet printing process with variable volume drops from two cases,one was the change of grid line area rate and the other was the change of the photoelectricconversion efficiency. The results showed that multi-pass ink-jet printing process withvariable volume drops could reduce the ratio between the grid line area and the active area ofthe solar cell, and improve the efficiency of the solar cell. |
PDF Full Text Request