Abstract
The development of a new composite dual cantilever beam (cDCB) thin-film adhesion testing method is reported, which allows the measurement of adhesion on the fragile thin substrates used in multijunction photovoltaics. We address the adhesion of several antireflective coating systems on multijunction cells. By varying interface chemistry and morphology, we demonstrate the ensuing 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 show that even with germanium substrates that fracture easily, quantitative measurements of adhesion can still 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.
Original language | American English |
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Number of pages | 6 |
State | Published - 2016 |
Event | 43rd IEEE Photovoltaic Specialists Conference - Portland, Oregon Duration: 5 Jun 2016 → 10 Jun 2016 |
Conference
Conference | 43rd IEEE Photovoltaic Specialists Conference |
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City | Portland, Oregon |
Period | 5/06/16 → 10/06/16 |
NREL Publication Number
- NREL/CP-5J00-66495
Keywords
- adhesion
- antireflective
- concentrator photovoltaic
- delamination
- durability
- multijunction cell
- reliability