In this work we study the degradation of roll-coated flexible inverted organic solar cells with the device architecture Ag/PEDOT:PSS/ZnO/FSP1:PCBM/PEDOT:PSS/Ag in different atmospheres. We demonstrate that impedance spectroscopy is a powerful tool for elucidating degradation mechanisms; it is used here to distinguish the different degradation mechanisms due to water and oxygen. Identical cells were exposed to different accelerated degradation environments using water only, oxygen only, and both water and oxygen simultaneously, all of them enhanced with UV light. The photocurrent is dramatically reduced in the oxygen-degraded samples. Impedance measurements indicate that this phenomenon is attributed to defects introduced by absorption of oxygen, which results in an increase of the acceptor impurity (NA) at the cathode interface obtained from a Mott-Schottky analysis. Simultaneously, at the anode interface where PEDOT:PSS is not shielded by the substrate, the nature of degradation differs for the water and oxygen degraded samples. While oxygen + UV light decreases the conductivity of the PEDOT:PSS layer, water + UV light changes the PEDOT:PSS work function inducing a depletion region at the anode.

中文翻译：

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使用阻抗谱分析氧气和水暴露对辊涂有机太阳能电池性能的影响

在这项工作中，我们研究了具有 Ag/PEDOT:PSS/ZnO/FSP1:PCBM/PEDOT:PSS/Ag 器件架构的辊涂柔性倒置有机太阳能电池在不同气氛中的降解。我们证明阻抗谱是阐明降解机制的有力工具；它在这里用于区分由于水和氧气导致的不同降解机制。相同的细胞暴露在不同的加速降解环境中，仅使用水、仅使用氧气、同时使用水和氧气，所有这些环境都用紫外线增强。氧降解样品中的光电流显着降低。阻抗测量表明，这种现象是由吸收氧气引入的缺陷造成的，这导致从 Mott-Schottky 分析获得的阴极界面处的受主杂质 (NA) 增加。同时，在 PEDOT:PSS 不受基材屏蔽的阳极界面处，水和氧降解样品的降解性质不同。氧气 + 紫外线会降低 PEDOT:PSS 层的电导率，而水 + 紫外线会改变 PEDOT:PSS 功函数，从而在阳极产生耗尽区。