Fluorine-induced self-doping and spatial conformation in alcohol-soluble interlayers for highly-efficient polymer solar cells

Jin, Xiufen; Wang, Yilin; Cheng, Xiaofang; Zhou, Huanyu; Hu, Lin; Zhou, Yinhua; Chen, Lie; Chen, Yiwang

doi:10.1039/c7ta08669e

Cited by 29 publications

(20 citation statements)

References 60 publications

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“…Encouragingly, ammonium and phosphonium salts are stable in ambient. And the Lewis base anions of abovementioned salts allow conducting mild electron transfer reaction to certain organic semiconductors, resulting in anion induced n‐doping . This n‐doping occurs between organics and its adjacent Lewis base anions mediated via the synergistic effects of coulomb attraction and anion–π interaction, which refers to π‐acidity arenes interacting with the closely contacted Lewis base anions to form anion–π complexes accordingly .…”

Section: Solution‐processable Conductive Organics Via Anion‐induced Nmentioning

confidence: 99%

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Yan

2019

Macro Chemistry & Physics

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The essential challenge for accessing high‐performance organic optoelectronics strongly relies on how to enable organic materials with high charge transport capabilities. This short review gives an elucidation of the mild n‐doping that occurs between Lewis base anions and n‐semiconductors, as well as their extension to develop solution‐processable conductive interlayers for organic and perovskite solar cells.

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Section: Solution‐processable Conductive Organics Via Anion‐induced Nmentioning

confidence: 99%

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Yan

2019

Macro Chemistry & Physics

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“…Conjugated polyelectrolytes (CPEs) have been employed as one of the most distinguished organic interlayers to improve electron injection or extraction. − Most of CPEs possess good solubility in green solvents, e.g., water and alcohol, due to the various polar groups attached on the main chain. At the same time, the polar groups can create favorable dipoles at the electrode/active layer interface, which was critical for the CPEs to minimize the interfacial energy barrier .…”

Section: Introductionmentioning

confidence: 99%

Regulation of the Polar Groups in n-Type Conjugated Polyelectrolytes as Electron Transfer Layer for Inverted Polymer Solar Cells

Tan

Chen

et al. 2018

Macromolecules

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Conjugated polyelectrolytes based on n-type backbone (n-CPEs) were recently developed as highly efficient cathode interlayers for polymer solar cells (PSCs), but the relevance between structure and property of n-CPEs has not been fully understood yet. Herein, three new self-doping n-CPEs based on the diketopyrrolopyrrole (DPP) alternated fluorene framework were reported. The effect of the number and location of polar groups on the properties of the new n-CPEs has been systematically studied. It can be found that the photoelectric properties of n-CPEs were sensitive to the number and location of polar groups. A tunable work function (WF), interfacial interaction, and conductivity of these n-CPEs can be readily realized by regulating the number and location of polar groups on the electron skeleton. The polar groups directly appending on the electron-withdrawing DPP unit can promote a stronger n-type self-doping and lower WF than the ones attached on the electron-pushing fluorene unit. Increasing the number of the polar groups can further optimize the photoelectric properties of conjugated electrolytes. As a result, upon incorporation of new n-CPEs as cathode buffer layer, the PSC performance was significantly improved to 8.3% for the fullerene system and 10.57% for the non-fullerene system. These results demonstrated that without complex molecular design, simply regulating the number and location of polar groups of the n-CPEs can provide a facile way to develop highly efficient cathode interlayers for high performance polymer solar cells.

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“…A diverse range of self-n-doped materials have been reported as efficient ETLs and cathode interlayers in solar cells, some with benchmark performances. [22][23][24]31,[189][190][191][192][193][194] Numerous examples were recently reviewed elsewhere in excellent detail. 195 N-PDIs have been shown to increase the broadband absorption of active layers, improve ETL homogeneity, and enhance solvent orthogonality for improved processability of BHJs.…”

Section: Solar Energymentioning

confidence: 99%

Concepts and principles of self-n-doping in perylene diimide chromophores for applications in biochemistry, energy harvesting, energy storage, and catalysis

Powell

Whittaker‐Brooks

2022

Preprint

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Self-doping is an important method of increasing carrier concentrations in organic electronics that completely eliminates the need to tailor host—dopant miscibility; a necessary step when employing molecular dopants. Self-n-doping can be accomplished using amine or ammonium moieties as an electron source, and is being incorporated into an ever-increasingly diverse range of organic materials spanning many applications. Self-n-doped materials have demonstrated good, and in many cases, benchmark performances in a variety of applications. However, an in-depth review of the method is lacking. Perylene diimide (PDI) chromophores are an important mainstay in the semiconductor literature with well-known structure-function characteristics and are also one of the most widely utilized scaffolds for self-n-doping. In this review, we describe the unique properties of self-n-doped PDIs, delineate structure-function relationships, and discuss self-n-doped PDI performance in a range of applications. In particular, the impact of amine/ammonium incorporation into the PDI scaffold on doping efficiency is reviewed with regard to attachment mode, tether distance, counterion selection, and steric encumbrance. Self-n-doped PDIs are a unique set of PDI structural derivatives whose properties are amenable to a broad range of applications in biochemistry, solar energy conversion, thermoelectric modules, batteries, and photocatalysis. Finally, we discuss challenges and the future outlook of self-n-doping principles.

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Fluorine-induced self-doping and spatial conformation in alcohol-soluble interlayers for highly-efficient polymer solar cells

Abstract: A new interface engineering strategy for non-fullerene polymer solar cells by employing a highly conductive interlayer with a fluorinated conjugated backbone to afford a power conversion efficiency of 11.51% based on the PBDB-T:ITIC active layer.

Cited by 29 publications

References 60 publications

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Regulation of the Polar Groups in n-Type Conjugated Polyelectrolytes as Electron Transfer Layer for Inverted Polymer Solar Cells

Concepts and principles of self-n-doping in perylene diimide chromophores for applications in biochemistry, energy harvesting, energy storage, and catalysis

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