Construction of Layered Structure of Anion–Cations To Tune the Work Function of Aluminum-Doped Zinc Oxide for Inverted Polymer Solar Cells,ACS Applied Materials & Interfaces

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Construction of Layered Structure of Anion–Cations To Tune the Work Function of Aluminum-Doped Zinc Oxide for Inverted Polymer Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsami.7b16653
Weitao Ma ₁ , Yinqi Luo ₁ , Li Nian ₁ , Jianqiao Wang ₁ , Xinbo Wen ₁ , Linlin Liu ₁ , Muddasir Hanif ₁ , Zengqi Xie ₁ , Yuguang Ma ₁

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Suitable work function (WF) of the cathode in polymer solar cells (PSCs) is of essential importance for the efficient electron extraction and collection to boost the power conversion efficiency. Herein, we report a facile and efficient method to tune the surface WF of aluminum-doped zinc oxide (AZO) through building of a definite interfacial dipole, which is realized by the construction of a layered structure of positive and negative ionized species. A cross-linked perylene bisimide (poly-PBI) thin film is deposited onto the AZO surface first, and then it is reduced to the radical anion state (poly-PBI^•–) in an electrochemical cell, using tetraoctylammonium (TOA⁺), a bulky cation, as a counter ion. Owing to the huge volume of TOA⁺, it is absorbed on the surface of the cross-linked PBI^•– thin film through Coulomb force, and thus a definite interface dipole is formed between the two ionized layers. Because of the definite interface dipole, the surface WF of the electrode modified with ionized layers is decreased dramatically to 3.9 eV, which is much lower than that of the electrode modified with the neutral PBI layer (4.5 eV). By using this novel cathode interlayer with a definite interface dipole in PSCs, a significantly increased open-circuit voltage (V_OC) is obtained. The results indicate that it is a facile and unique method by the construction of a definite interface dipole to tune the surface WF of the electrode for the application in organic electronic devices.

中文翻译：

阴离子阳离子层状结构的构建以调节倒置聚合物太阳能电池用铝掺杂氧化锌的功函数

聚合物太阳能电池（PSC）中阴极合适的功函数（WF）对于有效的电子提取和收集以提高功率转换效率至关重要。本文中，我们报告了一种通过构建确定的界面偶极子来微调掺杂铝的氧化锌（AZO）的表面WF的便捷方法，该方法通过构造正负离子化物质的分层结构来实现。首先将交联的bi双酰亚胺（poly-PBI）薄膜沉积在AZO表面上，然后使用四辛基铵（TOA ⁺）将其还原成电化学电池中的自由基阴离子态（poly-PBI ^•–），庞大的阳离子，作为抗衡离子。由于TOA ^+的数量巨大，它通过库仑力被吸收在交联的PBI ^•薄膜的表面上，因此在两个电离层之间形成了确定的界面偶极子。由于界面偶极子的确定，用电离层改性的电极的表面WF显着降低到3.9 eV，远低于用中性PBI层改性的电极的表面WF（4.5 eV）。通过在PSC中使用具有确定的界面偶极子的新型阴极夹层，可以获得明显提高的开路电压（V _OC）。结果表明，通过构造确定的界面偶极子来调节电极的表面WF以用于有机电子设备中，这是一种简便而独特的方法。

更新日期：2018-03-02

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