ADVANCED LASER PROCESSING FOR INDUSTRIAL SOLAR CELL MANUFACTURING - PDF by byk79441

VIEWS: 5 PAGES: 1

									ADVANCED LASER PROCESSING FOR INDUSTRIAL




                                                                                                                                                   SUSTAINABLE ENERGY PROGRAMMES
SOLAR CELL MANUFACTURING (ALPINISM)

                                                                              the laser process requirements and establish the trade-off between
                                                                              cell performance and cell throughput. These two activities will
                                                                              then be combined to establish high-speed laser processing of the
                                                                              cell. In addition to improving laser speed, development work
                                                                              undertaken by BP Solar will look at increasing cell-efficiency by
                                                                              incorporating a laser patterning technique for the fabrication of
                                                                              the rear cell contact.

                                                                              A prototype laser micromachining tool will then be built to
                                                                              demonstrate high-speed cell fabrication at high-yield, high-
                                                                              performance and low downtime. The laser tool will be designed
                                                                              to overcome previously experienced production problems with this
                                                                              type of equipment, including high machine downtime, slow wafer
                                                                              transfer times and maintenance difficulties.

                                                                              A plan will be developed which will cover the economic and
                                                                              technical assessment of the final process and will identify any
                                                                              remaining barriers to large-scale manufacture.

OBJECTIVES                                                                    The outcome of the project will be a high performance solar cell
                                                                              produced by high-speed laser micromachining and capable of high
• To develop laser processing as a cost-effective technique for               volume manufacture. A major milestone will be a 17% efficient
  the fabrication of advanced, high-efficiency crystalline silicon            cell, laser-processed in under 20 seconds.
  solar cells for terrestrial applications, to enable growth in the
  high-volume production of these cells in the near future.

• To increase the speed of laser grooving in the fabrication of
                                                                              CONTRACTOR
  Laser Grooved Buried Grid (LGBG) solar cells.                               BP Solar Limited
                                                                              European Technology Centre
• To develop laser processes for the ablation of sub-micron                   12 Brooklands Close
  dielectric layers from the surface of silicon wafers.                       Sunbury on Thames
                                                                              Middlesex
• To design and build a prototype laser machine tool.
                                                                              TW16 7DX
• To demonstrate the performance of the new processes with                    Tel: +44 (0)1932 765947
  the prototype machine tool.                                                 Fax: +44 (0)1932 765293
                                                                              E-mail: brutontm@bp.com
• To develop plans for commercial exploitation of the results of              (Contract Number: S/P2/00368/00/00)
  the project.
                                                                              COLLABORATOR
SUMMARY                                                                       Exitech
High-efficiency solar cells have the potential to significantly reduce
the cost of solar electricity, provided that cost-effective high-
throughput production techniques can be employed in their                     COST
fabrication.
                                                                              The total cost of the project is £1,204,000, with the Department
The aim of the project is to address manufacturing technology                 of Trade and Industry (DTI) contributing £397,320, and BP Solar
issues for the fabrication of high-efficiency (17-18%) silicon solar          and Exitech the balance.
cells, which will enable high-volume production of these cells in
the near future. It will focus on the LGBG solar cell that has
demonstrated high-efficiency but, for mass production, requires
                                                                              DURATION
high-speed laser micromachining technology to be commercially                 36 months - January 2001 to December 2003.
viable. The project will develop a high-throughput laser process
for cell fabrication and demonstrate the viability using a purpose-
built prototype laser micromachining tool.
                                                                                        Further renewable energy information from
The LGBG cell uses laser micromachining techniques to cut deep                        the Sustainable Energy Programmes, and copies
grooves in the silicon wafer. The laser technology for this                                of publications, can be obtained from:
operation will be optimised for high-speed cell processing. This                            Renewable Energy Helpline
will include the selection of laser type, laser power, pulse                                  Tel: +44 (0)1235 432450
frequency, beam delivery optics and beam/wafer transport system.                         E-mail: NRE-enquiries@aeat.co.uk
In parallel with this activity the cell will be redesigned to minimise               Web: www.dti.gov.uk/renewable/index.html




                                                                                                                                                    Project
                                                           Department of Trade and Industry                                                         Profile
     MARCH 2002
                                                           Publication Code RPP144
                                                             DTI/Pub URN 02/768                                                                        144

								
To top