Surface Modification of Backsheets Using Coupling Agents for Roll-To-Roll Processed Thin-Film Solar Photovoltaic (PV) Module Packaging Application

Jinho Hah, Michael Sulkis, Minsoo Kang, Zhijian Sun, Jihoon Kim, Kyoung-Sik Moon, Matthew Reese, Ching Wong

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations

Abstract

For many flexible electronic and photonic devices, moisture stability is one of the most important factors that affects its short- and long-term performance. To maintain the performance, the device should be packaged in such a way that it hermetically blocks moisture from the device; however, in practice, it is rather difficult to achieve. The more practical solution is to impede the moisture ingress to the device. In optoelectronic devices that will be outdoors like solar cells, the interfacial adhesion strength between the encapsulant layer (adhesive) and a moisture barrier layer is also a critical parameter. This paper presents surface modifications of poly(ethylene terephthalate) (PET) carrier films, one of the layers in the trilayer barrier film that directly adheres to an encapsulant, using chemical, UV/ozone, and both treatments to improve adhesion with the thermoset encapsulant polymer material. Whereas previous studies also utilized treatment methods to increase the wettability characteristics, in this paper, we not only present the results of the adhesion strength upon various techniques to achieve good adhesion but also screen their behavior upon exposure to a damp-heat (60 °C, 90% RH) environment. We found that the combined treatment method increases the adhesion by up to 12.1-fold and demonstrates up to a 200% increase in adhesion strength even upon our severe damp-heat environmental condition.

Original languageAmerican English
Pages (from-to)1682-1692
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number1
DOIs
StatePublished - 13 Jan 2021

Bibliographical note

Publisher Copyright:
©

NREL Publication Number

  • NREL/JA-5K00-78283

Keywords

  • 3M ultrabarrier film (UBF)
  • adhesives and encapsulants
  • functionalized silanes
  • interfacial adhesion strength
  • surface treatment

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