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EnglishHydrophobic layers are generated and chemisorbed onto standard coating materials for photovoltaic (PV) devices in order to improve their barrier properties against the atmospheric degradation agents and achieve a higher lifetime for the coated devices. The hydrophobic layers are deposited on PET-–SiOx substrates using two different molecules (alkylsilanes and fluoroalkylsilanes) as precursors. High liquid barrier properties are achieved for the fluoroalkylsilane coated PET-–SiOx, best results being average water contact angle > 130° and average oil contact angle > 90°. A chemical mechanism hypothesis is provided in order to explain the different reactive behavior observed for the PET-–SiOx samples with alkylsilanes and fluoroalkylsilanes, respectively. Moreover, the oxygen barrier properties are significantly improved by the fluoroalkylsilane layer deposited in ethanol, that leads to a 70% reduction of the Oxygen Transmission Rate (OTR) compared to that of the uncoated PET-SiOx substrate.
| Titolo: | Deposition of transparent and flexible nanolayer barrier on standard coating materials for photovoltaic devices |
| Autori: | |
| Data di pubblicazione: | 2014 |
| Rivista: | |
| Abstract: | Hydrophobic layers are generated and chemisorbed onto standard coating materials for photovoltaic (PV) devices in order to improve their barrier properties against the atmospheric degradation agents and achieve a higher lifetime for the coated devices. The hydrophobic layers are deposited on PET-–SiOx substrates using two different molecules (alkylsilanes and fluoroalkylsilanes) as precursors. High liquid barrier properties are achieved for the fluoroalkylsilane coated PET-–SiOx, best results being average water contact angle > 130° and average oil contact angle > 90°. A chemical mechanism hypothesis is provided in order to explain the different reactive behavior observed for the PET-–SiOx samples with alkylsilanes and fluoroalkylsilanes, respectively. Moreover, the oxygen barrier properties are significantly improved by the fluoroalkylsilane layer deposited in ethanol, that leads to a 70% reduction of the Oxygen Transmission Rate (OTR) compared to that of the uncoated PET-SiOx substrate. |
| Handle: | http://hdl.handle.net/11386/4255490 |
| Appare nelle tipologie: | 1.1.1 Articolo su rivista con DOI |
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