A new simple volatile solid additive triggers morphological optimization and performance stabilization in polymer solar cells

Yu, Weiyang; Song, Hang; Fu, Zhijie; Zhang, Guangquan; Chen, Haiyan; Kan, Zhipeng; Du, Liuying; Li, Jianfeng; Lu, Shirong

doi:10.1039/d2se00199c

Cited by 14 publications

(9 citation statements)

References 34 publications

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“…The active-layer morphology is one of the most critical parts of polymer solar cells and plays a crucial role in the performance of OSCs. [39][40][41][42][43][44][45][46][47][48][49][50][51] High-efficiency OSCs require suitable donor-acceptor phase separation size, high regional phase purity, good bicontinuous interpenetration networks, and a large donor/acceptor interface area, which allows for effective exciton dissociation, less recombination, charge transport, and effective improvement of photovoltaic device performance. For example, traditional additives such as 1,8-diiodooctane (DIO) and 1-chloronaphthalene (CN) were successfully utilized in the activelayer morphology optimization of various OSCs.…”

Section: Introductionmentioning

confidence: 99%

Improved Performance of Organic Solar Cells by Utilizing Green Non‐Halogen Additive to Modulate Active‐Layer Morphology

et al. 2022

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Using solvent additives to optimize the morphology of the blend films in organic solar cells (OSCs) is a simple and effective method. Here, methyl salicylate (MeSA) is used as a non‐halogen additive for inverted OSCs, and the impact of this additive on the blend film and photovoltaic performance is carefully investigated. The significant increase in short‐circuit current density (JSC) and fill factor (FF) leads to a significant improvement in device performance, which is caused by bicontinuous interpenetrating phase separation and balanced charge transport. The results indicate that MeSA modulates the phase distribution and promotes the accumulation of ordered molecules in the blend film, thus exhibiting an efficiency of 9.45% and improved FF (>70%) with a 7% MeSA additive. Most importantly, MeSA can be added in large doses (7%) compared to other traditional solvent additives (e.g., 1,8‐diiodooctane, 1‐chloronaphthalene, etc.), indicating that its concentration variation has little effect on performance and is conducive to repeatable, large‐scale production, which is of great importance for industrialization.

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Section: Introductionmentioning

confidence: 99%

Improved Performance of Organic Solar Cells by Utilizing Green Non‐Halogen Additive to Modulate Active‐Layer Morphology

et al. 2022

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“…The device structures for measuring electron mobility and hole mobility are found in our previous article. [ 71 ] The mobility is calculated by fitting the Mott–Gurney formula. The formula is defined in Equation (), and the physical meaning of the relevant parameters in the formula can be obtained from the literature.…”

Section: Resultsmentioning

confidence: 99%

All‐Green Solvent and Additive Combination Enables Efficient Nonfullerene Organic Solar Cells via Sequential Deposition Strategy

Zhang

Song

et al. 2023

Solar RRL

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The performance of organic solar cells mainly depends on the morphology of the active layer. Traditional solution‐processed active layers have poor performance due to the random distribution of donor and acceptor materials during solution processing. In addition, halogenated solvents and additives widely used in traditional fabrication processes will have a huge impact on human health and the environment. Herein, an all‐green solvent and additive combination strategy is proposed to assist the morphology control of the active layer with sequential deposition (SD) technique. Ultimately, with adopting benzyl viologen (BV) additive as well as ethyl alcohol treatment, PM6:Y6‐2BrO‐based devices yield a power conversion efficiency of 14.3%, higher than those of the control device (13.24%) and the device solely with BV additives (13.62%). The result demonstrates the feasibility of SD technique to finely control the morphology of active layer in future all‐green industrial production.

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“…[ 26,34 ] Among the solid additives, halogenated benzenes are representative categories with growing attraction in modulating the morphology of NFA‐based active layers. Over the past years, several halogenated benzene derivatives have been successfully used as additives, such as 1,4‐diiodotetrafluorobenzene, [ 34 ] 1,4‐diiodobenzene, [ 26 ] 1,3‐dibromo‐5‐chlorobenzene, [ 19,35 ] 1‐chloro‐4‐iodobenzene, [ 28 ] 2,6‐dichloroiodobenzene, [ 36 ] and 1,3,5‐trichlorobenzene, [ 37 ] 1,3,5‐tribromobenzene, [ 38 ] etc. These halogenated benzenes with simple structures are commercially available and cheap enough.…”

Section: Introductionmentioning

confidence: 99%

“…The halogen atoms provide diverse weak-bonding interactions with the photoactive materials for morphology optimization, and the volatilizable nature makes them be easily removed to guarantee morphology stability. [7,26,36] Most recently, Hou et al employed 1,3-dibromo-5-chlorobenzene to tune molecular packing and phase separation of PBQx-TF:eC9-2Cl, resulting in an impressive PCE of 19.2%. [19] Despite the above great success, principles governing the efficient design of volatile solid additives remain elusive.…”

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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A new simple volatile solid additive triggers morphological optimization and performance stabilization in polymer solar cells

Abstract: For the ever-increasing power conversion eﬃciencies (PCEs) of organic solar cells (OSCs), the exploitation of excellent volatile solid additive is an important appeal for morphology optimization and performance stabilization. Here,...

Cited by 14 publications

References 34 publications

Improved Performance of Organic Solar Cells by Utilizing Green Non‐Halogen Additive to Modulate Active‐Layer Morphology

Improved Performance of Organic Solar Cells by Utilizing Green Non‐Halogen Additive to Modulate Active‐Layer Morphology

All‐Green Solvent and Additive Combination Enables Efficient Nonfullerene Organic Solar Cells via Sequential Deposition Strategy

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

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