Lending Triarylphosphine Oxide to Phenanthroline: a Facile Approach to High-Performance Organic Small-Molecule Cathode Interfacial Material for Organic Photovoltaics utilizing Air-Stable Cathodes
Lending Triarylphosphine Oxide to Phenanthroline: a Facile Approach to High-Performance Organic Small-Molecule Cathode Interfacial Material for Organic Photovoltaics utilizing Air-Stable Cathodes
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将三芳基氧化膦借给菲咯啉：一种利用空气稳定阴极制备高性能有机小分子阴极界面材料的简便方法，用于有机光伏发电
DOI：
10.1002/adfm.201401685
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发表时间：
2014
影响因子：
19
通讯作者：
Cao Yong
中科院分区：
文献类型：
--
作者：
Tan Wan-Yi;Wang Rui;Li Min;Liu Gang;Chen Ping;Li Xin-Chen;Lu Shun-Mian;Zhu Hugh Lu;Peng Qi-Ming;Zhu Xu-Hui;Chen Wei;Choy Wallace C. H.;Li Feng;Peng Junbiao;Cao Yong
阴极界面材料（CIM）对于提高采用高功函数阴极的有机光伏电池的功率转换效率（PCE）和长期稳定性至关重要。在这篇文章中，通过三芳基氧化膦与 1,10-菲咯啉基单元的有效且简单的组合，报道了一种新型 CIM。由此产生的 CIM 具有易于合成和纯化、116 °C 的高 Tg 和有吸引力的电子传输特性。涉及 Ag 或 Al 阴极的光伏器件的表征表明，这种热沉积中间层可以显着提高 PCE，这主要是由于相对于没有 CIM 的参考器件，Voc 和 FF 同时增加。值得注意的是，利用有源层 PTB7:PC71BM 的 CIM/Ag 器件获得了 7.51% 的 PCE，远远超过了参考 Ag 器件，并且与 Ca/Al 器件的 PCE 相当。 CIM/Al 器件的 PCE 进一步增加至 8.56%（Jsc= 16.81 mA cm−2，Voc= 0.75 V，FF= 0.68）。紫外光电子能谱研究表明，这种有前途的 CIM 可以显着降低 Ag 金属以及 ITO 和 HOPG 的功函数，并促进 OPV 器件中的电子提取。
Cathode interfacial material (CIM) is critical to improving the power conversion efficiency (PCE) and long‐term stability of an organic photovoltaic cell that utilizes a high work function cathode. In this contribution, a novel CIM is reported through an effective and yet simple combination of triarylphosphine oxide with a 1,10‐phenanthrolinyl unit. The resulting CIM possesses easy synthesis and purification, a highTgof 116 °C and attractive electron‐transport properties. The characterization of photovoltaic devices involving Ag or Al cathodes shows that this thermally deposited interlayer can considerably improve the PCE, due largely to a simultaneous increase inVocandFFrelative to the reference devices without a CIM. Notably, a PCE of 7.51% is obtained for the CIM/Ag device utilizing the active layer PTB7:PC71BM, which far exceeds that of the reference Ag device and compares well to that of the Ca/Al device. The PCE is further increased to 8.56% for the CIM/Al device (withJsc= 16.81 mA cm−2,Voc= 0.75 V,FF= 0.68). Ultraviolet photoemission spectroscopy studies reveal that this promising CIM can significantly lower the work function of the Ag metal as well as ITO and HOPG, and facilitate electron extraction in OPV devices.