Recent progress on non-fullerene acceptors for organic photovoltaics

Sun, Hua; Chen, Fei; Chen, Zhi-Kuan

doi:10.1016/j.mattod.2018.09.004

Cited by 124 publications

(73 citation statements)

References 185 publications

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“…37 . (2). Degassed toluene (30 mL) was added to a mixture of methyl-2-bromobenzoate 1 (5 g, 22.79 mmol) and tributyl(thiophen-2-yl)stannane (10.2 g, 27.34 mmol).…”

Section: Methodsmentioning

confidence: 99%

“…Major contributors to the recent resurgence of organic photovoltaics (OPVs) [1][2][3] , molecular non-fullerene acceptors (NFAs) have driven up power conversion efficiencies (PCEs), in a short amount of time, from "what a fullerene derivative does best" 4,5 to more than 15% [6][7][8] . Although these records were reached with indacenodithiophene derivatives, perylene diimides (PDIs) have always held an important place among the electron transporting materials due to their excellent thermal, chemical and photochemical stabilities combined with their singular optical, redox and charge transport properties 9,10 .…”

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confidence: 99%

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Indeno[1,2-b]thiophene End-capped Perylene Diimide: Should the 1,6-Regioisomers be systematically considered as a byproduct?

Marqués

Tintori

Castán

et al. 2020

Sci Rep

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Usually considered as a byproduct, the 1,6-dibrominated PDI has rarely been functionalized for the preparation of electro-active conjugated molecules, particularly in the field of organic photovoltaics. In light of the literature, one can ask oneself: Does a 1,7-isomer based functional molecule systematically perform better than its 1,6-analogue? To answer this question, we report herein the synthesis and direct comparison of two indeno[1,2-b]thiophene (IDT) end-capped perylene diimide regioisomers (PDI) (1,6 and 1,7) used as non-fullerene acceptors in organic solar cells. It turned out that in our case, ie, when blended with the well-known PTB7-Th donor polymer, higher performance was reached for devices made with the 1,6-analogue.

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“…37 . (2). Degassed toluene (30 mL) was added to a mixture of methyl-2-bromobenzoate 1 (5 g, 22.79 mmol) and tributyl(thiophen-2-yl)stannane (10.2 g, 27.34 mmol).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Indeno[1,2-b]thiophene End-capped Perylene Diimide: Should the 1,6-Regioisomers be systematically considered as a byproduct?

Marqués

Tintori

Castán

et al. 2020

Sci Rep

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“…Imide-based NFAs are not discussed in this review, and some excellent reviews were already published recently. [39][40][41][42][43][116][117][118] Figure 5 contains chemical structures of some of NFAs with PCBM, and Table 1 contains OSC parameters including optoelectronic characteristics of the NFAs.…”

Section: Earlier Developments On Nfasmentioning

confidence: 99%

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

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140

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The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement from ≈2.5% in 2013 to 17.3% in 2018 in OSC performance is primarily credited to novel nonfullerene acceptors (NFA), especially fused ring electron acceptors (FREAs). FREAs offer unique advantages over FAs, like broad absorption of solar radiation, and they can be extensively chemically manipulated to tune optoelectronic and morphological properties. Herein, the current status in FREA‐based OSCs is summarized, such as design strategies for both wide and narrow bandgap FREAs for BHJ, all‐small‐molecule OSCs, semi‐transparent OSC, ternary, and tandem solar cells. The photovoltaics parameters for FREAs are summarized and discussed. The focus is on the various FREA structures and their role in optical and morphological tuning. Besides, the advantages and drawbacks of both FAs and NFAs are discussed. Finally, an outlook in the field of FREA‐OSCs for future material design and challenges ahead is provided.

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“…PDI derivatives have received considerable attention as SMAs due to their chemical and environmental robustness, high electron affinity, low‐lying energy levels, good absorption, and extended π‐conjugation with high electron mobility . Furthermore, their cost‐effective synthesis and the ability to tailor functionality make them promising for production on a large scale . Despite the above advantages, the technology for PSCs based on PDIs still lags far behind other technologies, which is partially due to the strong self‐aggregation tendency of PDI skeletons and the poor morphology of their active layer .…”

Section: Introductionmentioning

confidence: 99%

Achieving a High Fill Factor and Stability in Perylene Diimide–Based Polymer Solar Cells Using the Molecular Lock Effect between 4,4′‐Bipyridine and a Tri(8‐hydroxyquinoline)aluminum(III) Core

Zhang

Lee

et al. 2019

Adv Funct Materials

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Two novel perylene diimide (PDI)-based derivatives, Alq 3 -PDI and Alq 3 -PDI2, are synthesized by flanking a 3D tri(8-hydroxyquinoline)aluminum(III) (Alq 3 ) core with PDI and a helical PDI dimer (PDI2) to construct high-performance small molecular nonfullerene acceptors (SMAs). The 3D Alq 3 core significantly suppresses the molecular aggregation of the resulting SMAs, leading to a well-mixed blend with a PTTEA donor polymer and weak phase separation. Compared with Alq 3 -PDI, the extended π-conjugation of Alq 3 -PDI2 results in higher-order molecular packing, which improves the absorption and phase separation behavior. Thus, the Alq 3 -PDI2 devices have higher J sc and FF values and better device performance, which are further enhanced by a small amount of 4,4′-bipyridine (Bipy) as an additive. The coordination between Bipy and the Alq 3 core promotes molecular packing and phase separation, which lower charge recombination and enhanced charge collection in the resulting devices. Therefore, a largely improved J sc of 15.74 mA cm −2 and very high FF of 71.27% are obtained in the Alq 3 -PDI2 devices, resulting in a power conversion efficiency of 9.54%, which is the best value reported for PDI-based polymer solar cells. The coordination can also serve as a "molecular lock," which prevents molecular motion and thus improves device stability.

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Recent progress on non-fullerene acceptors for organic photovoltaics

Cited by 124 publications

References 185 publications

Indeno[1,2-b]thiophene End-capped Perylene Diimide: Should the 1,6-Regioisomers be systematically considered as a byproduct?

Indeno[1,2-b]thiophene End-capped Perylene Diimide: Should the 1,6-Regioisomers be systematically considered as a byproduct?

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Achieving a High Fill Factor and Stability in Perylene Diimide–Based Polymer Solar Cells Using the Molecular Lock Effect between 4,4′‐Bipyridine and a Tri(8‐hydroxyquinoline)aluminum(III) Core

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