Terpolymers Containing Difluorobenzoxadiazole Enable Suppressed Energy Losses and Optimal Batch‐to‐Batch Reproducibility for High‐Efficiency Organics Solar Cells

Xie, Dongsheng; Pan, Langheng; Liu, Tao; Pang, Shuting; Deng, Wanling; Oh, Jiyeon; Liu, Xinyuan; Yang, Changduk; Wu, Hongbin; Duan, Chunhui

doi:10.1002/solr.202300182

Cited by 6 publications

(3 citation statements)

References 48 publications

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“…Among these polymers, PMZ ‐ 10 : Y6 based OSCs demonstrated an outstanding PCE of 18.23 %. By introducing 5,6‐difluorobenzo[c][1,2,5]oxadiazole ( ffBX ) unit as the third comonomer, the terpolymer PBFBX 20 exhibited downshifted the HOMO and a PCE of 17.5 % with excellent batch‐to‐batch reproducibility [144] . By introducing a BNIDT block into the PM6 polymer backbone, Peng et al .…”

Section: Fluorinated Polymer Donorsmentioning

confidence: 99%

Fluorinated Polymer Donors for Nonfullerene Organic Solar Cells

Li,

Wang,

Chen

et al. 2024

Chemistry A European J

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The rapid development of narrow‐bandgap non‐fullerene acceptors (NFAs) has boosted the efficiency of organic solar cells over 19%. The new features of high‐performance NFAs, such as visible‐NIR light absorption, moderate HOMO, and high crystallinity, require polymer donors with matching physical properties. This emphasizes the importance of methods that can effectively tune the physical properties of polymers. Owning to very small atom size and strongest electronegativity, the fluorination has been proved the most efficient strategy to regulate the physical properties of polymer donors, including frontier energy level, absorption coefficient, dielectric constant, crystallinity and charge transport. Owing to the success of fluorination strategy, the vast majority of high‐performance polymer donors possess one or more fluorine atoms. In this review, the fluorination synthetic methods, the synthetic route of well‐known fluorinated building blocks, the fluorinated polymers which are categorized by the type of donor or acceptor units, and the relationships between the polymer structures, properties, and photovoltaic performances are comprehensively surveyed. We hope this review could provide the readers a deeper insight into fluorination strategy and lay a strong foundation for future innovation of fluorinated polymers.

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Section: Fluorinated Polymer Donorsmentioning

confidence: 99%

Fluorinated Polymer Donors for Nonfullerene Organic Solar Cells

Li,

Wang,

Chen

et al. 2024

Chemistry A European J

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“…With the rapid development of highly efficient small molecule electron-acceptor (SMA) materials such as ITIC, Y6, and especially multitudinous Y6-based derivatives in recent years, − up until now, above 19–20% PCEs have been successfully achieved in OSCs with changed materials and tuned device structures. However, at present, only several polymers like PM6, D18, and PTQ10, having complemental absorption regions and suitable energy levels, can realize compelling photovoltaic performances with Y6-type acceptors. − Therefore, finding and preparing new polymer electron donors is significant in further promoting the performance of OSCs.…”

Section: Introductionmentioning

confidence: 99%

Terpolymer Containing a meta-Octyloxy-phenyl-Modified Dithieno[3,2-f:2′,3′-h]quinoxaline Unit Enabling Efficient Organic Solar Cells

Zhou,

Liu,

Liang

et al. 2024

ACS Appl. Mater. Interfaces

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With the rapid development of small-molecule electron acceptors, polymer electron donors are becoming more important than ever in organic photovoltaics, and there is still room for the currently available high-performance polymer donors. To further develop polymer donors with finely tunable structures to achieve better photovoltaic performances, random ternary copolymerization is a useful technique. Herein, by incorporating a new electron-withdrawing segment 2,3-bis(3-octyloxyphenyl)dithieno[3,2-f:2′,3′-h]quinoxaline derivative (C12T-TQ) to PM6, a series of terpolymers were synthesized. It is worth noting that the introduction of the C12T-TQ unit can deepen the highest occupied molecular orbital energy levels of the resultant polymers. In addition, the polymer Z6 with a 10% C12T-TQ ratio possesses the highest film absorption coefficient (9.86 × 104 cm–1) among the four polymers. When blended with Y6, it exhibited superior miscibility and mutual crystallinity enhancement between Z6 and Y6, suppressed recombination, better exciton separation and charge collection characteristics, and faster hole transfer in the D–A interface. Consequently, the device of Z6:Y6 successfully achieved enhanced photovoltaic parameters and yielded an efficiency of 17.01%, higher than the 16.18% of the PM6:Y6 device, demonstrating the effectiveness of the meta-octyloxy-phenyl-modified dithieno[3,2-f:2′,3′-h]quinoxaline moiety to build promising terpolymer donors for high-performance organic solar cells.

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“…[39][40][41] Encouraged by multiple blending, copolymerization involving diverse building blocks emerges as a viable approach to optimize electronic structures of PDs. [42] The copolymerization strategy offers significant potential for enhancing the performance of OSCs. Furthermore, comprehensive comparative studies are imperative for practical implementations of these two strategies.…”

Section: Introductionmentioning

confidence: 99%

Cyanoesterthiophene Based Low‐Cost Polymer Donors for High Efficiency Organic Solar Cells

Wang,

Bi,

et al. 2024

Adv Funct Materials

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To achieve commercial application of organic solar cells (OSCs), it is necessary to reduce material costs and improve device efficiency. This paper reports on the utilization of a multifunctional building block, namely 3‐cyanoesterthiophene, which exhibits simple structure and accessibility of synthetic for cost‐effective and high‐performance polymer donors (PDs). Meanwhile, ternary and terpolymerization strategies have been studied. Two similar PDs, PBTCl0‐TCA and PBTCl100‐TCA, are synthesized, and the devices exhibit less‐than‐satisfactory efficiency of 13.21% and 11.53% due to mismatching energy level and imperfect morphology. The two PDs with comparable structures and commendable compatibility easily form alloy‐like phase in active layer, which can effectively boost the efficiency of ternary devices to 14.17% with retained high JSC and significant improved open‐circuit voltage (VOC) and fill factor (FF). Encouraged by the ternary blending phenomenon, a polymer donor (PBTCl50‐TCA) with same ratio by random terpolymerization is designed. And over 17% efficiency binary OSCs using terpolymerization donor are demonstrated. The synergies of incorporation of the cyanoester‐group and terpolymer endow the developed PDs with deep‐lying energy levels, face‐on orientation, thermodynamic miscibility with the prevailing nonfullerene acceptor and appropriate polymer crystallinity. The findings study provide valuable insights and support for the advancement of cost‐effective and high‐performance PDs.

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Terpolymers Containing Difluorobenzoxadiazole Enable Suppressed Energy Losses and Optimal Batch‐to‐Batch Reproducibility for High‐Efficiency Organics Solar Cells

Abstract: Scheme 1. The structures' design and synthetic route of PBFBXx polymers.

Cited by 6 publications

References 48 publications

Fluorinated Polymer Donors for Nonfullerene Organic Solar Cells

Fluorinated Polymer Donors for Nonfullerene Organic Solar Cells

Terpolymer Containing a meta-Octyloxy-phenyl-Modified Dithieno[3,2-f:2′,3′-h]quinoxaline Unit Enabling Efficient Organic Solar Cells

Cyanoesterthiophene Based Low‐Cost Polymer Donors for High Efficiency Organic Solar Cells

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