Kinetic study on UV-absorber photodegradation under different conditions

Bubev, Emil; Georgiev, Anton; Machkova, М.

doi:10.1016/j.chemphys.2016.08.004

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…For instance, higher temperatures may accelerate the reaction kinetics. 28 A simple Arrhenius law that is generally used in degradation rates modelling 30 associates our last results (4200 h of accelerated ageing) with outdoor ageing in desert that may range from 10 to 24 years depending on the apparent activation energy (30 18 to 60 kJÁmol À131 ).…”

Section: Discussionmentioning

confidence: 84%

“…Because the fluorescent encapsulant part over the cross connector is smaller, photobleaching seems more advanced in the case of EVA‐UV compared to that of TPOA‐UV. UV degradation in a given environment may differ because of their different chemical nature, 27 and the various polymer matrices can differently influence the behaviour and stability of such additives 28 . As such, the differences in UV‐cut encapsulant formulations may explain the variability of the fluorophore formation and photobleaching balance.…”

Section: Resultsmentioning

confidence: 99%

“…Table 3 the behaviour and stability of such additives. 28 As such, the differences in UV-cut encapsulant formulations may explain the variability of the fluorophore formation and photobleaching balance.…”

Section: Degradation Of Uv Absorbers Under High Uv Irradiancementioning

confidence: 99%

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Solar cell UV‐induced degradation or module discolouration: Between the devil and the deep yellow sea

Pinochet

Couderc

Thérias

2023

Progress in Photovoltaics

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For decades, photovoltaic (PV) module yellowing caused by UV exposure has been observed on solar arrays in operation. More than an aesthetic inconvenience, this phenomenon can severely impair module performance and promote other degradation mechanisms by undermining the photoprotection provided by encapsulation. To understand how this reaction may affect current encapsulation materials, silicon heterojunction (SHJ) monocell modules with either UV‐cut or UV‐transparent commercial encapsulants were aged under UV irradiation and examined by visual inspection, fluorescence imaging and flash tests. Despite the photoprotection they provide, only the encapsulants that were stabilised by UV absorbers underwent discolouration. On the one hand, UV absorber photodegradation is responsible for the formation of yellow chromophores that affect light transmission to the cell, which could cause net decrease in the photogenerated current high as 4% after 4200 h of accelerated UV ageing. On the other hand, UV‐induced degradation of SHJ solar cells only accounts for a lower photogenerated current loss (3%), in contrast with previous observations in the literature. According to the behaviour of the current encapsulation formulation, the stability of UV absorbing additives has to be improved to ensure the durability of the device over 30 years.

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Section: Discussionmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%