Degradation of encapsulants for photovoltaic modules made of ethylene vinyl acetate studied by positron annihilation lifetime spectroscopy

被引：4

作者：

Hagihara, Hideaki ^{[1
]}

Kunioka, Masao ^{[1
]}

Suda, Hiroyuki ^{[1
]}

Hara, Yukiko ^{[2
]}

Masuda, Atsushi ^{[2
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Sustainable Chem, Tsukuba, Ibaraki 3058565, Japan

[2] Natl Inst Adv Ind Sci & Technol, Res Ctr Photovolta, Tsukuba, Ibaraki 3058568, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2016年 / 55卷 / 10期

关键词：

FREE-VOLUME; COPOLYMER; MEMBRANES; ACID;

D O I：

10.7567/JJAP.55.102302

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structure of ethylene vinyl acetate (EVA) encapsulants of crystalline-Si photovoltaic modules after the damp heat (DH) test was evaluated by positron annihilation lifetime spectroscopy (PALS). A reduction in free-volume hole size, which indicates the progress of deacetylation, was observed after the DH test. The difference in lifetime (Delta r) between the initial and DH-tested samples clearly increased after the DH test for 3000 h. The increase in Delta r was correlated with the acetic acid concentration in the EVA estimated by ion chromatography. The depth profile analysis by slow positron beam PALS revealed that Delta r in the near-surface region of the Si-cell side was significantly larger than that of the cover-glass side. This result indicates that deacetylation near the Si cell/EVA interface is accelerated. (C) 2016 The Japan Society of Applied Physics

引用

页数：5

共 29 条

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