Low cost commercial high-efficiency selective emitter solar cells with non-busbar inkjet printing pattern

Abstract

The direct inkjet printing method involves the deposition of a wax droplet onto a wafer surface. Wax is used as a resistance layer during etch-back wet process, which coats on top of the dielectric surface with the same Ag electrode printing pattern. Drop on demand (DOD) inkjet printing selective emitter (SE) process has higher performance but more cost because of the additional raw materials, we need to balance the cost of wax exhaust and the efficiency rise. In this paper, we report a sort of new inkjet wax printing pattern, except at the busbar location which has the same printing pattern with the normality.We tested the cell infrared ray response (IR), module power and module electroluminescence (EL), in contrast to the normal inkjet printing pattern cell we found there is no any abnormal phenomenon for the new inkjet printing pattern cell near bus-bar area. Furthermore, the conversion efficiency is comparable in the mass production environment.