The synthesis of three random copolymers—BD2FON‐OB30, BD2FON‐OB50, and BD2FON‐OB70—comprised of different molar ratios of alkoxyphenylene and alkoxynaphthalene is reported by adjusting the ratio of these units for optimized energy levels. When organic photovoltaics are fabricated using these polymers as the electron donor, introduction of the binary solvent additive dramatically enhances power conversion efficiency (PCE) up to 7%, compared to those of the devices without additive (≈2% of PCE_max) and with single additive (≈3% of PCE_max). (without additive: 1–2% and with single additive: 0–3%). These improvements result from minimized bimolecular recombination and balanced electron/hole mobility ratio by optimized bicontinuous D:A morphology in the active layer. Thus, the strategy shows the efficient enhancement of device efficiency by control the morphology using binary solvent additives in the bulk heterojunction film consisting of polymer and fullerene.

中文翻译：

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烷氧基并苯基无规共聚物和二元溶剂添加剂的合成，用于高效有机光伏

据报道，通过调节这些单元的比例以获得最佳能级，可以合成三种无规共聚物BD2FON-OB30，BD2FON-OB50和BD2FON-OB70，它们具有不同摩尔比的烷氧基亚苯基和烷氧基萘。当有机光伏器件在使用这些聚合物作为电子给体制造，引入二元溶剂添加剂的显着提高功率转换效率（PCE）高达7％，比起那些设备的无添加剂（的≈2％PCE_最大值），并用单一添加剂（_最大PCE的≈3％）。（无添加剂：1-2％，有一种添加剂：0-3％）。这些改进归因于活性层中优化的双连续D：A形态，从而使双分子重组减至最少，并实现了平衡的电子/空穴迁移率。因此，该策略通过在由聚合物和富勒烯组成的本体异质结薄膜中使用二元溶剂添加剂控制形态来显示出器件效率的有效提高。