Abstract
The Emitter Wrap-Through (EWT) solar cell is a back-contacted solar cell with a carrier-collection junction (“emitter”) on the front surface. Elimination of grids from the front surface allows for higher performance by eliminating grid-obscuration losses and reducing series resistance, while keeping an emitter on the front surface maintains high collection efficiency in solar-grade materials with modest diffusion lengths. The EWT cell uses laser-drilled vias to wrap the emitter diffusion on the fi-ont surface to interdigitated contacts on the back surface. We report on progress towards demonstration of two concepts for the EWT cell. The first EWT concept uses a fabrication sequence based on heavily diffused grooves and plated metallizations, and the second EWT concept uses a single fb-nace step and screen-printed metallizations. We also report on demonstration of double-sided carrier collection in the EWT cell.
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