Fabrication of electrode groove on silicon solar cell by high‐pressure surface discharge

Abstract

SUMMARYWe propose a low-cost plasma process technique to fabricate narrower front electrode grooves on a single crystalline silicon solar cell, in which a surface discharge operated at high pressure etches a silicon nitride film 150 nm thick on a silicon layer. Tests showed that the surface discharge could effectively etch the silicon nitride film in a short time; a high etching rate exceeding 3000 nm/min was obtained. Narrow and uniform grooves with a width of less than 70 µm were obtained when the pressure in the chamber, the back electrode length, and the etching time were 152 kPa, 2 mm, and 10 s, respectively. Narrower electrode grooves could be obtained when the back electrode length was short and the pressure was high. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(4): 28-35, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com).