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Title: Advent / Sandia Emitter Wrap Through (EWT) Photovoltaic (PV) Cell Technology Part 2.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1148004
Report Number(s):
SAND2007-2850C
523247
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the Federal Laboratory Consortium for Technology Transfer Annual Meeting held May 15-18, 2007 in Arlington, TX.
Country of Publication:
United States
Language:
English

Citation Formats

Smith, Paul M. Advent / Sandia Emitter Wrap Through (EWT) Photovoltaic (PV) Cell Technology Part 2.. United States: N. p., 2007. Web.
Smith, Paul M. Advent / Sandia Emitter Wrap Through (EWT) Photovoltaic (PV) Cell Technology Part 2.. United States.
Smith, Paul M. Tue . "Advent / Sandia Emitter Wrap Through (EWT) Photovoltaic (PV) Cell Technology Part 2.". United States. doi:. https://www.osti.gov/servlets/purl/1148004.
@article{osti_1148004,
title = {Advent / Sandia Emitter Wrap Through (EWT) Photovoltaic (PV) Cell Technology Part 2.},
author = {Smith, Paul M.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

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  • The authors present a new cell concept (Emitter Wrap-Through or EWT) for a back-contact cell. The cell has laser-drilled vias to wrap the emitter on the front surface to contacts on the back surface and uses a potentially low-cost process sequence. Modeling calculations show that efficiencies of 18 and 21% are possible with large-area solar-grade multi- and monocrystalline silicon EWT cells, respectively.
  • No abstract prepared.
  • Back-contact solar cells have the potential to reduce module assembly costs and give a higher conversion efficiency. Such a device must be simple to fabricate on an industrial scale and be tolerant of low minority-carrier diffusion lengths. The emitter-wrap-through (EWT) cell is a device design that can meet these goals. In this device, the diffused junction is present on both sides and is connected by laser-drilled holes through the silicon. EWT cells were frequently found to have poor fill factors (FF's) due to shunt-like behavior. The holes were found to possess no defects that adversely affect device performance. However, detailedmore » equivalent circuit modeling of the EWT cell was able to explain the shunt-like behavior. Experiments were performed to confirm the physical mechanisms described by the equivalent circuit model. Device optimization guided by the equivalent circuit model has led to the demonstration of large area EWT cell with a FF of 77.6% and efficiency of 18.2%.« less