School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia.
Electronic Materials Research Lab, College of Science and Engineering, James Cook University, Townsville 4811, Australia.
Sci Rep. 2017 Mar 30;7:45599. doi: 10.1038/srep45599.
Optically transparent, smooth, defect-free, chemically inert and with good adhesion to a variety of substrates, plasma polymers from plant-derived secondary metabolites have been identified as promising encapsulating materials for organic electronics and photovoltaics. Here, we demonstrate that an encapsulating layer of plasma polymerized γ-terpinene reduces degradation-related loss in conversion efficiency in PCPDTBT:PCBM solar cells under ambient operating conditions. The stability of γ-terpinene films was then investigated under extreme UV irradiation conditions as a function of deposition power. When exposed to ambient air, prolonged exposure to UV-A and UV-B light led to notable ageing of the polymer. Photooxidation was identified as the main mechanism of degradation, confirmed by significantly slower ageing when oxygen was restricted through the use of a quartz cover. Under unnatural high-energy UV-C irradiation, significant photochemical degradation and oxidation occurred even in an oxygen-poor environment.
等离子体聚合的植物源次生代谢产物具有光学透明、光滑、无缺陷、化学惰性以及与各种基底良好附着等特点，被认为是有机电子和光伏器件有前途的封装材料。在这里，我们证明了等离子体聚合的γ-松油烯作为封装层，可以减少在环境工作条件下 PCPDTBT:PCBM 太阳能电池中与降解相关的转换效率损失。然后，我们研究了γ-松油烯薄膜在极端紫外辐照条件下沉积功率的影响。当暴露在环境空气中时，长时间的 UV-A 和 UV-B 光照会导致聚合物明显老化。通过使用石英盖限制氧气，发现光氧化是降解的主要机制，这得到了证实，因为当限制氧气时，聚合物老化速度明显变慢。在非自然的高能 UV-C 辐照下，即使在贫氧环境中，也会发生严重的光化学降解和氧化。
