Here we report the effect of an additive solvent, 1,8-diiodooctane (DIO), on the performance of a bilayer organic photovoltaic device in which the active layer comprises poly[2,7-(9,9-bis(2 ethylhexyl)-dibenzosilole)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PSiF-DBT) as the electron donor material and C 60 as the electron acceptor material. We observed that when the donor layer was treated with 1% of DIO the power conversion efficiency (PCE) of the device increased by 138.4% in relation to the device with an untreated donor layer, and 21.3% in relation to the device containing a donor layer submitted to thermal annealing. The main effects that lead to this increase in PCE are the large interfacial area between donor and acceptor materials and the improved conductivity at low voltages. The increase in polymer surface roughness leads to a more effective PSiF-DBT/C 60 interface for exciton dissociation. This effect, as well as the increase in the cond...

中文翻译：

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了解溶剂添加剂在聚合物薄膜中的作用：将双层变成块状异质结光伏器件

在这里，我们报告了添加剂溶剂1,8-二碘辛烷（DIO）对双层有机光伏器件性能的影响，其中活性层包含聚[2,7-（9,9-双（2乙基己基）] -二苯并甲硅烷基）-alt-4,7-双（噻吩-2-基）苯并-2,1,3-噻二唑]（PSiF-DBT）作为电子给体材料，C 60作为电子受体材料。我们观察到，用1％的DIO处理施主层时，器件的功率转换效率（PCE）相对于未处理施主层的器件提高了138.4％，相对于包含施主层的器件提高了21.3％层进行热退火。导致PCE增加的主要影响是施主和受主材料之间的界面面积大以及低压下导电性的提高。聚合物表面粗糙度的增加导致激子解离的PSiF-DBT / C 60界面更有效。这种效果，以及不断增加的...