A study for degradation of flexible organic photovoltaic modules via damp-heat test: By accessing individual layers of the module
A study for degradation of flexible organic photovoltaic modules via damp-heat test: By accessing individual layers of the module
复制标题
通过湿热测试研究柔性有机光伏模块的降解：通过访问模块的各个层
DOI：
10.1016/j.solmat.2015.08.037
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发表时间：
2016
影响因子：
6.9
通讯作者：
Donghwan Kim
中科院分区：
文献类型：
--
作者：
S. Kim;H. Son;S. Park;Jungseok Hahn;Donghwan Kim
研究了槽模涂覆的铟锡氧化物（ITO）/ZnO/光活性层/聚（3，4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）/Ag倒置结构的柔性有机光伏（OPV）组件在湿热条件下的稳定性。这项工作主要侧重于了解有机光伏组件在非常恶劣的工作条件下（85 °C/85%相对湿度[rh]）的降解机制。测量OPV模块的电变化作为湿热下老化时间的函数。观察到模块效率的快速下降，主要是由开路电压（Voc）和填充因子（FF）的下降引起的。我们推测组件的劣化主要是由氧气和湿气透过阻障膜的末端或边缘所造成。通过降解观察到组成器械的层的物理改性;因此，进行了形态学和化学分析。分析表明，Ag原子迁移到电池的层间，导致分流路径增加，这是湿热环境下OPV组件Voc和FF降低的主要原因。ZnO层也被来自扩散的PEDOT：PSS聚合物的酸性分子蚀刻。此外，在湿热条件下1000 h，同时评估了多个OPV组件的性能参数。虽然模块的初始效率不同，但观察到相同的寿命模式。还讨论了寿命模式的解释和对显示不同初始效率的模块进行客观比较的建议。
The stability of slot-die coated flexible organic photovoltaic (OPV) modules with inverted structures of indium tin oxide (ITO)/ZnO/photoactive layer/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/Ag was analyzed under damp heat conditions. The work primarily focused on the understanding of the degradation mechanism of organic photovoltaic modules in very severe operating conditions (85 °C/85% relative humidity [rh]). The electrical change of the OPV module was measured as a function of the aging time under damp heat. A rapid drop in the efficiency of the module was observed, mainly caused by the decline of the open-circuit voltage (Voc) and fill factor (FF). We supposed that the degradation of the modules mainly progressed by the oxygen and moisture penetrating the terminals or at the edges of the barrier films. The physical modification of the layers composing the device by degradation was observed; hence, morphological and chemical analyses were conducted. The analyses revealed that Ag atoms migrated to the interlayers of the cell, resulting in the increase of shunt paths; this was the main reason underlying the reduction ofVocand FF of the OPV module under damp heat. The ZnO layer was also etched by the acidic molecules from the diffused PEDOT:PSS polymer. In addition, the performance parameters of several OPV modules were evaluated simultaneously under damp heat conditions for 1000 h. The same lifetime patterns were observed although the initial efficiencies of the modules were diverse. The interpretation of the lifetime patterns and a suggestion for an objective comparison between the modules showing different initial efficiencies were also addressed.