N-Type Self-Doped Water/Alcohol-Soluble Conjugated Polymers with Tailored Energy Levels for High-Performance Polymer Solar Cells,Macromolecules

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N-Type Self-Doped Water/Alcohol-Soluble Conjugated Polymers with Tailored Energy Levels for High-Performance Polymer Solar Cells
Macromolecules ( IF 5.1 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acs.macromol.8b00126
Jianchao Jia ₁ , Baobing Fan ₁ , Manjun Xiao ₁ , Tao Jia ₁ , Yaocheng Jin ₁ , Yuan Li ₁ , Fei Huang ₁ , Yong Cao ₁

Affiliation

Naphthalene diimide (NDI) and perylene diimide (PDI) based polymeric semiconductors with high mobility have shown great promise as electron transport materials (ETMs) in applications such as high-performance polymer solar cells (PSCs) and other optoelectronic devices. However, these NDI and PDI semiconductors usually have limited adjustment of the lowest unoccupied molecular orbital (LUMO) energy levels, which hinders their further use in the organic electronic device. Here, by using various degrees of esterification instead of imide groups, three perylenetetracarboxylic acid derivatives based, self-doped, n-type water/alcohol-soluble conjugated polymers (n-WSCPs) were developed, which can act as electron transport layers (ETLs) to produce high-performance PSCs. Owing to the distinct electron-deficient nature of the backbones, these n-WSCPs exhibited different optoelectronic properties. The relationships between doping effects, charge-transporting capabilities, interfacial modifications, and structures of n-WSCPs were systematically investigated. When these n-WSCPs were used as ETLs, high-performance PSCs with the efficiencies of near 9% and over 10% were achieved in the combinations of poly[[2,6-4,8-di(5-ethylhexylthienyl)benzo[1,2-b;3,3-b]dithiophene]-[3-fluoro-2[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7-Th)/[6,6]-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM) and poly(2,5-thiophene-alt-5,5′-(5,10-bis(4-(2-octyldodecyl)thiophen-2-yl)naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole)) (PNTT)/PC₇₁BM, respectively. The device of PNTT/PC₇₁BM still exhibited a high PCE of 9.37% when the thickness of ETL was increased to 50 nm. Our results demonstrate the identical importance of energy level alignment and electron transporting in the design of n-WSCPs used for thickness-insensitive ETLs in PSCs for large area practical applications.

中文翻译：

适用于高性能聚合物太阳能电池的N型自掺杂水/醇共轭聚合物，具有可定制的能级。

具有高迁移率的基于萘二酰亚胺（NDI）和per二酰亚胺（PDI）的聚合物半导体作为电子传输材料（ETM）在高性能聚合物太阳能电池（PSC）和其他光电设备等应用中已显示出广阔的前景。然而，这些NDI和PDI半导体通常对最低的未占用分子轨道（LUMO）能级的调节有限，这阻碍了它们在有机电子器件中的进一步使用。在这里，通过使用不同程度的酯化反应代替酰亚胺基团，开发了三种基于ylene四羧酸衍生物的自掺杂n型水/醇溶共轭聚合物（n-WSCPs），它们可以用作电子传输层（ETL））以生产高性能的PSC。由于主链具有明显的电子不足特性，这些n-WSCP表现出不同的光电特性。系统研究了掺杂效应，电荷传输能力，界面修饰和n-WSCPs结构之间的关系。当将这些n-WSCP用作ETL时，在聚[[2,6-4,8-二（5-乙基己基噻吩基）苯并]的组合中，获得了效率接近9％且超过10％的高性能PSC。 1,2-b ; 3,3- b ]二噻吩]-[3-氟-2 [（2-乙基己基）羰基]噻吩并[3,4- b ]噻吩基]]（PTB7-Th）/ [6,6]-苯基- ç ₇₁ -丁酸甲酯（PC ₇₁ BM）和聚（2,5-亚噻吩ALT -5,5' - （5,10-双（4-（2-辛基十二烷基）噻吩-2-基）萘并[ 1,2- c：5,6- c '] bis（[1,2,5] thiadiazole））（PNTT）/ PC ₇₁ BM。PNTT / PC ₇₁的装置当ETL的厚度增加到50 nm时，BM仍显示9.37％的高PCE。我们的结果证明，在用于大面积实际应用的PSC中用于厚度不敏感的ETL的n-WSCP的设计中，能级对准和电子传输具有同等重要的意义。

更新日期：2018-03-06

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