SELECTIVE EMITTER FOR INDUSTRIAL SOLAR CELL PRODUCTION: A WET CHEMICAL APPROACH USING A SINGLE SIDE DIFFUSION PROCESS

This work describes the implementation of a novel process for a single diffusion selective emitter fabrication on mono- and multicrystalline silicon solar cells. To create a selective emitter structure a wet chemical route for an emitter etch back process has been applied. The areas of the wafer that are intended for front side metallization are shielded from etching by an acid resistant etch barrier. The emitter etch back and the removing of the etch barrier are implemented by a wet chemical process. By means of successfully transferring the described selective emitter structure on a standard screen printed cell process an increase of efficiency of more than 0.3 %abs. has been achieved.