Capitalizing on the Glass-Etching Effect of Silver Plating Chemistry to Contact Si Solar Cells With Homogeneous 100-110 Omega / hbox sq Emitters

Homogeneous high-sheet-resistance emitter (HHSE), excellent surface passivation, and high-quality contacts, along with narrow gridlines, are needed for high-efficiency solar cells. However, HHSE in conjunction with screen-printed (SP) contacts often gives low fill factor (FF) because of high contact resistance. We capitalized on the glass-etching property of light-induced plating of silver to decrease the contact resistance and formed high-quality contacts to 100-110 Omega / hbox sq HHSE. This led to the achievement of 78.5% FF, 38.3 hbox mA / cm 2 short-circuit current density ( J rm SC ) due to narrow line widths (65 mu hbox m ), and efficiency of 18.7%.