2D Conjugated Polyelectrolytes Possessing Identical Backbone with Active-Layer Polymer as Cathode Interlayer for Organic Solar Cells.,Macromolecular Rapid Communications

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2D Conjugated Polyelectrolytes Possessing Identical Backbone with Active-Layer Polymer as Cathode Interlayer for Organic Solar Cells.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-01-24 , DOI: 10.1002/marc.201900624
Xuan Liu _{1,

2} , Wei Nie _{1,

2} , Dandan Tu _{1,

2} , Xin Guo ₁ , Can Li ₁

Affiliation

A 2D conjugated polyelectrolyte (CPE), PBDTTh-TT-NBr, having the same backbone as the highly efficient donor polymer PTB7-Th and the quaternary ammonium pendant, is synthesized as a cathode interlayer (CIL) material for PTB7-Th-based fullerene and non-fullerene solar cells. The quaternary ammonium group is connected to the 2D conjugated backbone by a long, flexible alkyl chain, facilitating the modification of cathode via forming interface dipoles. Moreover, compared with another CPE analogue to PTB7, PBDT-TT-NBr, without the 2D conjugated backbone, the PBDTTh-TT-NBr presents a higher similarity in polymer structure to the donor polymer PTB7-Th. This feature makes it more compatible with the PTB7-Th-based active-layer film, improving the electron transport. With the PBDTTh-TT-NBr as the CIL, devices afford higher performances than those using the PBDT-TT-NBr in both fullerene and non-fullerene systems. This work offers guidance on choosing the CIL material that ought to possess a highly similar structure to the active-layer component.

中文翻译：

二维共轭聚电解质，具有与活性层聚合物相同的骨干作为有机太阳能电池的阴极中间层。

合成具有与高效供体聚合物PTB7-Th和季铵侧基相同的主链的2D共轭聚电解质（CPE）PBDTTh-TT-NBr，作为基于PTB7-Th的富勒烯的阴极中间层（CIL）材料和非富勒烯太阳能电池。季铵基团通过一条长而柔软的烷基链连接到2D共轭主链上，从而通过形成界面偶极子来促进阴极的修饰。此外，与没有2D共轭骨架的另一种CPT类似PTB7的CPE类似物PBDT-TT-NBr相比，PBDTTh-TT-NBr在聚合物结构上与供体聚合物PTB7-Th具有更高的相似性。此功能使其与基于PTB7-Th的有源层薄膜更加兼容，从而改善了电子传输。以PBDTTh-TT-NBr作为CIL，与在富勒烯和非富勒烯系统中使用PBDT-TT-NBr的设备相比，这些设备提供更高的性能。这项工作为选择CIL材料提供了指导，该材料应具有与活性层组件高度相似的结构。

更新日期：2020-01-24

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