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Interplay of Optical, Morphological, and Electronic Effects of ZnO Optical Spacers in Highly Efficient Polymer Solar Cells

机译：ZnO光学间隔物在高效聚合物太阳能电池中的光学，形态和电子效应的相互作用

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Optical spacers based on metal oxide layers have been intensively studied in poly(3-hexylthiophene) (P3HT) based polymer solar cells for optimizing light distribution inside the device, but to date, the potential of such a metal oxide spacer to improve the electronic performance of the polymer solar cells simultaneously has not yet be investigated. Here, a detailed study of performance improvement in high efficient polymer solar cells by insertion of solution-processed ZnO optical spacer using ethanolamine surface modification is reported. Insertion of the modified ZnO optical spacer strongly improves the performance of polymer solar cells even in the absence of an increase in light absorption. The electric improvements of the device are related to improved electron extraction, reduced contact barrier, and reduced recombination at the cathode. Importantly, it is shown for the first time that the morphology of optical spacer layer is a crucial parameter to obtain highly efficient solar cells in normal device structures. By optimizing optical spacer effects, contact resistance, and morphology of ZnO optical spacers, poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7):[6,6]-phenyl-C71-butyric acid (PC70BM) bulk heterojunction solar cells with conversion efficiency of 7.6% are obtained in normal device structures with all-solution-processed interlayers.
机译：在基于聚（3-己基噻吩）（P3HT）的聚合物太阳能电池中，已经对基于金属氧化物层的光学隔离物进行了深入研究，以优化器件内部的光分布，但迄今为止，这种金属氧化物隔离物改善电子性能的潜力同时还没有研究聚合物太阳能电池的数量。在此，详细报道了通过使用乙醇胺表面改性方法插入溶液处理的ZnO光学间隔物来提高高效聚合物太阳能电池性能的详细研究。甚至在不增加光吸收的情况下，插入改性的ZnO光学隔离物也可以大大提高聚合物太阳能电池的性能。器件的电气改进与改善电子提取，减少接触势垒和减少阴极复合有关。重要的是，首次显示光学间隔层的形态是在常规器件结构中获得高效太阳能电池的关键参数。通过优化光学间隔物效应，接触电阻和ZnO光学间隔物的形态，聚[[4,8-双[（2-乙基己基）氧基]苯并[1,2-b：4,5-b']二噻吩-2 ，6二基] [3-氟-2-[（2-乙基己基）羰基]噻吩并[3,4-b]噻吩二基]（PTB7）：[6,6]-苯基-C71-丁酸（PC70BM）本体异质结在具有全部溶液处理的中间层的常规器件结构中，可获得转换效率为7.6％的太阳能电池。

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