Improved geometry of heavily diffused emitters in high-efficiency silicon solar cells

An equation has been formulated for calculating the power loss in two-dimensional (2-D) emitters in solar cells with dot contacts and used to evaluate the current crowding that occurs in 2-D geometry. Based on this evaluation, a solar cell structure is proposed that uses line-shaped heavily diffused emitters under dot contacts, in contrast to the cell structure adopted by the University of New South Wales Group, which has dot-shaped heavily diffused emitters under dot contacts. The effectiveness of the proposed emitter geometry was verified by both calculation and measurement