Double-Dipole Induced by Incorporating Nitrogen-Bromine Hybrid Cathode Interlayers Leads to Suppressed Current Leakage and Enhanced Charge Extraction in Non-Fullerene Organic Solar Cells,Advanced Science

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Double-Dipole Induced by Incorporating Nitrogen-Bromine Hybrid Cathode Interlayers Leads to Suppressed Current Leakage and Enhanced Charge Extraction in Non-Fullerene Organic Solar Cells
Advanced Science ( IF 14.3 ) Pub Date : 2023-07-03 , DOI: 10.1002/advs.202302460
Yangchao Zheng ₁ , Jingjing Zhao ₁ , Huanpeng Liang ₁ , Zhenmin Zhao ₁ , Zhipeng Kan _{1,

2}

Affiliation

The cathode interlayer plays a vital role in organic solar cells, which can modify the work function of electrodes, lower the electron extraction barriers, smooth the surface of the active layer, and remove solvent residuals. However, the development of organic cathode interlayer lags behind the rapidly improved organic solar cells because their intrinsic high surface tension can lead to poor contact with the active layers. Herein, a double-dipole strategy is proposed to enhance the properties of organic cathode interlayers, which is induced by incorporating nitrogen- and bromine-containing interlayer materials. To verify this approach, the state-of-the-art active layer composed of PM6:Y6 and two prototypical cathode interlayer materials, PDIN and PFN-Br is selected. Using the cathode interlayer PDIN: PFN-Br (0.9:0.1, in wt.%) in the devices can reduce the electrode work function, suppress the dark current leakage, and improve charge extractions, leading to enhanced short circuit current density and fill factor. The bromine ions tend to break from PFN-Br and form a new chemical bond with the silver electrode, which can adsorb extra dipoles directed from the interlayer to silver. These findings on the double-dipole strategy provide insights into the hybrid cathode interlayers for efficient non-fullerene organic solar cells.

中文翻译：

通过纳入氮-溴混合阴极中间层诱导的双偶极子可抑制非富勒烯有机太阳能电池中的电流泄漏并增强电荷提取

阴极中间层在有机太阳能电池中起着至关重要的作用，它可以改变电极的功函数，降低电子提取势垒，使活性层表面光滑，并去除溶剂残留。然而，有机阴极中间层的发展落后于快速改进的有机太阳能电池，因为其固有的高表面张力会导致与活性层的接触不良。在此，提出了双偶极子策略来增强有机阴极中间层的性能，这是通过掺入含氮和溴的中间层材料引起的。为了验证这种方法，选择了由 PM6:Y6 和两种典型阴极中间层材料 PDIN 和 PFN-Br 组成的最先进的活性层。在器件中使用阴极中间层PDIN:PFN-Br（0.9:0.1，以wt.%计）可以降低电极功函数，抑制暗电流泄漏，提高电荷提取，从而提高短路电流密度和填充因子。溴离子倾向于从 PFN-Br 上断裂并与银电极形成新的化学键，该化学键可以吸附从中间层引导到银的额外偶极子。这些关于双偶极子策略的发现为高效非富勒烯有机太阳能电池的混合阴极夹层提供了见解。

更新日期：2023-07-03

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