Progress on the Emitter Wrap-Through silicon solar cell
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 front 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 furnace step and screen-printed metallizations. We also report on demonstration of double-sided carrier collection in the EWT cell.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10145909
- Report Number(s):
- SAND-93-1684C; CONF-940423-1; ON: DE94010382; BR: GB0103012
- Resource Relation:
- Conference: 12. European photovoltaic solar energy conference and exhibition,Amsterdam (Netherlands),11-15 Apr 1994; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Emitter Wrap-Through solar cell
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