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Title: Quantitative adhesion characterization of antireflective coatings in multijunction photovoltaics

We discuss the development of a new composite dual cantilever beam (cDCB) thin-film adhesion testing method, which enables the quantitative measurement of adhesion on the thin and fragile substrates used in multijunction photovoltaics. In particular, we address the adhesion of several 2- and 3-layer antireflective coating systems on multijunction cells. By varying interface chemistry and morphology through processing, we demonstrate the marked effects on adhesion and help to develop an understanding of how high adhesion can be achieved, as adhesion values ranging from 0.5 J/m2 to 10 J/m2 were measured. Damp heat (85 degrees C/85% RH) was used to invoke degradation of interfacial adhesion. We demonstrate that even with germanium substrates that fracture relatively easily, quantitative measurements of adhesion can be made at high test yield. The cDCB test is discussed as an important new methodology, which can be broadly applied to any system that makes use of thin, brittle, or otherwise fragile substrates.
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Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0927-0248
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solar Energy Materials and Solar Cells; Journal Volume: 153
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), PREDICTS (Physics of Reliability: Evaluating Design Insights for Component Technologies in Solar) Program
Country of Publication:
United States
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; adhesion; antireflective; delamination; multijunction; photovoltaic; reliability