Abstract
All polycrystalline heterojunction solar cells with various thicknesses of film were prepared by the coating and sintering method in an attempt to optimize the thickness of the sintered film whose role is to be the window as well as the front contact for the solar cell. The thickness of the films was varied from 14 to 55 μm by changing the screen mesh size of a screen printer and the solid‐liquid ratio of the slurry which consisted of powder, 9 weight percent and propylene glycol. Average grain size of the sintered films increases and porosity decreases with an increase in film thickness. Electrical resistivity of the sintered films shows a minimum value in 35 μm thick film. Highest optical transmission is observed in 20 μm thick film. The remaining in the film after the sintering causes an increase in the thickness of the solid solution layer, acting as a sintering aid, at the interface between the and the films. The combination of the optical transmission, the solid solution layer, and the sheet resistance effects resulted in the highest solar efficiency in a heterojunction solar cell with 20 μm thick layer.
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