Rheological and Mechanical Considerations for Photovoltaic Encapsulants

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Photovoltaic (pv) devices are encapsulated in polymeric materials not only for corrosion protection, but also for mechanical support. Even though ethylene-vinyl acetate (EVA) suffers from having both glass and melting phase transitions at temperatures experienced under environmental exposure, its low cost and good optical transmission made EVA the most commonly used material for PV modules. These transitions, however, cause EVA to embrittle at low temperatures (~ -15 deg C) and to be very soft at high temperatures (>40 deg C). From mechanical considerations, one would prefer a material that was relatively unchanged under a wide temperature range. This would produce ... continued below

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5 p.

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Kempe, M. D. November 1, 2005.

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Photovoltaic (pv) devices are encapsulated in polymeric materials not only for corrosion protection, but also for mechanical support. Even though ethylene-vinyl acetate (EVA) suffers from having both glass and melting phase transitions at temperatures experienced under environmental exposure, its low cost and good optical transmission made EVA the most commonly used material for PV modules. These transitions, however, cause EVA to embrittle at low temperatures (~ -15 deg C) and to be very soft at high temperatures (>40 deg C). From mechanical considerations, one would prefer a material that was relatively unchanged under a wide temperature range. This would produce a more predictable and reliable package. These concerns are likely to become more important as silicon based cells are made thinner.

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5 p.

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  • Related Information: Presented at the 2005 DOE Solar Energy Technologies Program Review Meeting held November 7-10, 2005 in Denver, Colorado. Also included in the proceedings available on CD-ROM (DOE/GO-1020060-2245; NREL/CD-520-38577)

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  • Report No.: NREL/CP-520-38972
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 882810
  • Archival Resource Key: ark:/67531/metadc891622

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  • November 1, 2005

Added to The UNT Digital Library

  • Sept. 23, 2016, 2:42 p.m.

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  • April 6, 2017, 12:41 p.m.

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Kempe, M. D. Rheological and Mechanical Considerations for Photovoltaic Encapsulants, article, November 1, 2005; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc891622/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.