Solid additive-assisted morphology optimization enables efficient nonhalogen solvent-processed polymer solar cells

Li, Xiaoxiao; Yang, Huameng; Fan, Hongyu; Hu, Kewei; Cao, Haoyu; Cui, Chaohua; Li, Yongfang

doi:10.1039/d2tc03838b

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…37,[77][78][79][80][81][82][83][84] Meanwhile, the additive strategy employs the addition of small amounts of specific agents to modify the dynamic process of crystal formation in the active layer, thus achieving better molecular mixing and higher PCEs. 49,[85][86][87][88][89][90][91][92][93] As for the posttreatment method, it applies selective treatment processes to the films after deposition to enhance their morphologies or further influence the crystallization of the photoactive materials. 23,79,88,[94][95][96][97][98][99] Finally, the film coating method regulation is used to control factors such as temperature, humidity, solution concentration, coating speed, drying time, etc., which affect the quality of the active layer film, creating an ideal structure for efficient exciton dissociation and charge transport.…”

Section: Morphology Optimization (Device Engineering)mentioning

confidence: 99%

Progress in organic photovoltaics based on green solvents: from solubility enhancement to morphology optimization

Kong,

He,

Qiu

et al. 2023

Chem. Commun.

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Section: Morphology Optimization (Device Engineering)mentioning

confidence: 99%

Progress in organic photovoltaics based on green solvents: from solubility enhancement to morphology optimization

Kong,

He,

Qiu

et al. 2023

Chem. Commun.

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“…This makes the solvent additives, which have ever been extensively used in fullerene‐based OSCs, [ 19 ] confront challenges in optimizing the morphology of NFA‐based photoactive layers via the selective solubility mechanism. [ 17 , 20 ] Alternatively, employing volatile solid additives has been emerging as a potential method to optimize the morphology of currently prevailing NFA‐based OSCs. [ 12 , 21 , 22 , 23 , 24 ] Volatile solid additives typically encompass a small aromatic core attached to various functional groups, making them have intrinsically high crystallinity and versatile noncovalent intermolecular interactions.…”

Section: Introductionmentioning

confidence: 99%

Crossbreeding Effect of Chalcogenation and Iodination on Benzene Additives Enables Optimized Morphology and 19.68% Efficiency of Organic Solar Cells

Zhou,

Jin,

et al. 2024

Advanced Science

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Volatile solid additives have attracted increasing attention in optimizing the morphology and improving the performance of currently dominated non‐fullerene acceptor‐based organic solar cells (OSCs). However, the underlying principles governing the rational design of volatile solid additives remain elusive. Herein, a series of efficient volatile solid additives are successfully developed by the crossbreeding effect of chalcogenation and iodination for optimizing the morphology and improving the photovoltaic performances of OSCs. Five benzene derivatives of 1,4‐dimethoxybenzene (DOB), 1‐iodo‐4‐methoxybenzene (OIB), 1‐iodo‐4‐methylthiobenzene (SIB), 1,4‐dimethylthiobenzene (DSB) and 1,4‐diiodobenzene (DIB) are systematically studied, where the widely used DIB is used as the reference. The effect of chalcogenation and iodination on the overall property is comprehensively investigated, which indicates that the versatile functional groups provided various types of noncovalent interactions with the host materials for modulating the morphology. Among them, SIB with the combination of sulphuration and iodination enabled more appropriate interactions with the host blend, giving rise to a highly ordered molecular packing and more favorable morphology. As a result, the binary OSCs based on PM6:L8‐BO and PBTz‐F:L8‐BO as well as the ternary OSCs based on PBTz‐F:PM6:L8‐BO achieved impressive high PCEs of 18.87%, 18.81% and 19.68%, respectively, which are among the highest values for OSCs.

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“…Unlike fullerene acceptors, NFAs possess similar planar conjugated backbones to donor materials, and thus similar solubility in common solvent additives, which brings challenges in regulating morphology via the selective solubility mechanism. [27] Moreover, these low volatile additives are difficult to be entirely removed, the constant effect of their residues on the photoactive layer is also detrimental to the long-term device stability. [19,24,26,[28][29][30] Alternative to solvent additives, volatile solid additives are recognized as more promising candidates to optimize the blend morphology of OSCs.…”

Section: Introductionmentioning

confidence: 99%

Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination

Ran,

Liang,

et al. 2023

Adv Funct Materials

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Employing volatile solid additives have emerged as a promising method to optimize the morphology and improve the performance of organic solar cells (OSCs). However, principles governing the efficient design of solid additives remain elusive. Herein, the programmed fluorination and/or bromination on benzene core to develop efficient additives for OSCs is reported. The programmed fluorination and/or bromination endow the five halogen benzene derivatives, 1,3,5‐trifluorobenzene, hexafluorobenzene, 1,3,5‐tribromo‐2,4,6‐trifluorobenzene (TFTB), 1,3,5‐tribromobenzene, and hexabromobenzene, with different melting and boiling points, volatility, as well as interactions with the host blend. Studies indicate that the additives with extremely high and low volatility are almost powerless and even detrimental to the morphology evolution. Among them, the combination of fluorine and bromine atoms on TFTB not only enables the more appropriate m.p./b.p. and volatility, but also exerts stronger molecular interactions with the host blend, giving rise to higher ordered molecular packing and more favorable morphology. Importantly, TFTB exhibits good universality to optimize the performances of OSCs with high power conversion efficiencies (PCEs; over 18%) in a group of binary blend systems, and an impressive PCE of 19.43% in the ternary PBTz‐F:PM6:L8‐BO system.

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Solid additive-assisted morphology optimization enables efficient nonhalogen solvent-processed polymer solar cells

Abstract: Controlling and optimizing the photoactive layer morphology is closely related to the process of exciton dissociation, charge transfer and collection, and thus is crucial for building a high-performance polymer solar...

Cited by 5 publications

References 37 publications

Progress in organic photovoltaics based on green solvents: from solubility enhancement to morphology optimization

Progress in organic photovoltaics based on green solvents: from solubility enhancement to morphology optimization

Crossbreeding Effect of Chalcogenation and Iodination on Benzene Additives Enables Optimized Morphology and 19.68% Efficiency of Organic Solar Cells

Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination

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