Degradation behaviors of EVA encapsulant and AZO films in Cu(In,Ga) Se sub(2) photovoltaic modules under accelerated damp heat exposure

This paper focuses on the degradation behavior of ethylene vinyl acetate (EVA) and Al-doped ZnO (AZO) films in CIGS PV modules after the damp heat test. We observed losses of the FF and efficiency in the modules after 1000 h of damp heat (DH) exposure and some of them were discolored from the outsid...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2015-05, Vol.136, p.135-141
Main Authors: Lee, Dong-Won, Cho, Won-Ju, Song, Jun-Kwang, Lee, Jun-Tae, Park, Chi-Hong, Park, Kyung-Eun, Lee, Heesoo, Kim, Yong-Nam
Format: Article
Language:English
Subjects:
ACETATES
Azo
CIGS
COPPER SELENIDE
DAMPING PROPERTIES
Dampness
Degradation
DISCOLORATION
ELECTRICAL CONDUCTIVITY
Ethylene vinyl acetates
MECHANICAL PROPERTIES
Modules
Photovoltaic cells
Solar cells
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Summary:This paper focuses on the degradation behavior of ethylene vinyl acetate (EVA) and Al-doped ZnO (AZO) films in CIGS PV modules after the damp heat test. We observed losses of the FF and efficiency in the modules after 1000 h of damp heat (DH) exposure and some of them were discolored from the outside edge and the center. To clarify the degradation behavior of the non-discolored and discolored modules, a failure analysis for each position of the EVA and AZO in the CIGS module films from the edge to the center was performed. The resistivity of the AZO films in the non-discolored modules increased due to the adsorption of oxygen. In discolored modules, the resistivity of the AZO films rapidly increased at the edge region, and the morphologies of the AZO films were also changed due to the chemical degradation of EVA. These degradation behaviors of the AZO films and EVA in discolored modules were attributed to the formation of hydroxyl and carboxylic species caused by water penetration. Moreover, we reported that the transmittance and the mechanical properties of EVA after 1000 h DH exposure were deteriorated by water molecules.
ISSN:0927-0248
DOI:10.1016/j.solmat.2014.12.036