Cathode interfacial layers (CIL) have been applied in organic solar cells (OSCs) for the enhancement of photovoltaic characteristics. Most of them are employed in either conventional organic solar cells (COSCs) or inverted organic solar cells (IOSCs) only. Herein, we have designed and synthesized two cathode interfacial materials, namely, 3-(4,6-bis(4-bromophenoxy)-1,3,5-triazin-2-yl)-2,6-difluorophenyl)diphenylphosphine oxide (Br-PO-TAZ) and 4,4′-((6-(3-(diphenylphosphoryl)-2,4-difluorophenyl)-1,3,5-triazine-2,4-diyl)bis(oxy))dibenzonitrile (CN-PO-TAZ), and utilized them as CILs for both COSCs and IOSCs. The incorporation of our new CIL layers significantly enhanced the photovoltaic performance compared to COSCs and IOSCs without the CILs. The CN-PO-TAZ exhibited a power conversion efficiency (PCE) of 8.19% for COSCs and 8.33% for IOSCs, whereas Br-PO-TAZ yielded a PCE of 8.15% for COSCs and 8.23% for IOSCs, respectively. The improved performance was attributed to the multiple favorable factors: significantly reducing leakage current, decreasing series resistance, suppressing recombination, efficient charge transport and collection. Moreover, the CIL layers helped for sustaining device stability because they served as an internal shield against humidity.

中文翻译：

---

基于三嗪/氧化膦的常规和倒置有机太阳能电池阴极界面材料

阴极界面层（CIL）已应用于有机太阳能电池（OSC）中，以增强光伏特性。它们中的大多数仅用于常规有机太阳能电池（COSC）或倒置有机太阳能电池（IOSC）。在这里，我们设计并合成了两种阴极界面材料，即3-（4,6-双（4-溴苯氧基）-1,3,5-三嗪-2-基）-2,6-二氟苯基）二苯基氧化膦（ Br-PO-TAZ）和4,4'-（（（6-（3-（二苯基磷酰基）-2,4-二氟苯基）-1,3,5-三嗪-2,4-二基）双（氧基））二苄腈（CN-PO-TAZ），并将它们用作COSC和IOSC的CIL。与没有CIL的COSC和IOSC相比，我们新的CIL层的结合大大提高了光伏性能。CN-PO-TAZ对COSC的功率转换效率（PCE）为8.19％，对于IOSC的功率转换效率为8.33％，而Br-PO-TAZ对COSC的PCE分别为8.15％和IOSC的8.23％。性能的提高归因于多种有利因素：显着降低漏电流，降低串联电阻，抑制重组，有效的电荷传输和收集。此外，CIL层有助于保持器件的稳定性，因为它们充当了防潮的内部屏障。