High photovoltaic performance of as-cast devices based on new quinoxaline-based donor–acceptor copolymers

Zhao, Mingzhi; Qiao, Zi; Chen, Xiaofeng; Jiang, Chenglin; Li, Xiaoyü; Li, Yongfang; Wang, Haiqiao

doi:10.1039/c7py01060e

Cited by 13 publications

(10 citation statements)

References 43 publications

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“…The highly planar and strong electron-accepting nature of heteroaromaticquinoxaline (Q) units have made them promising π-conjugates for developing efficient polymeric donors for OSCs. [24][25][26][27][28] Noticeably, a variety of quinoxaline-based polymers have been investigated in fullerene (PC 70 BM)based OSCs, and these polymers exhibited intense absorption in the UV region along with a deep HOMO level, high crystallinity, and good energy conversion efficiency of up to 9%. [24][25][26][27][28] Impressively, the overall performance of quinoxaline-based polymeric donors was further improved to 13%-18% with the use of NFAs instead of PC 70 BM.…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26][27][28] Noticeably, a variety of quinoxaline-based polymers have been investigated in fullerene (PC 70 BM)based OSCs, and these polymers exhibited intense absorption in the UV region along with a deep HOMO level, high crystallinity, and good energy conversion efficiency of up to 9%. [24][25][26][27][28] Impressively, the overall performance of quinoxaline-based polymeric donors was further improved to 13%-18% with the use of NFAs instead of PC 70 BM. [29][30][31][32][33] In contrast, quinoxaline-based NFAs have also recently been reported for OSCs and offered a maximum PCE of 17.5% when blended with polymeric donors.…”

Section: Introductionmentioning

confidence: 99%

“…Earlier reports indicated that aryl substituents were mostly attached to the 2-and 3-positions of 6,7-difluoroquinoxaline (ffQ)-based polymers. [24][25][26][27][28][29][30][31][32][33] We were interested in utilizing alkyl-substituted 6,7-difluoroquinoxaline units because the solubility of the resulting polymer is crucial for their solution processability. More recently, we reported a series of 2,3-didodecyl-6,7-difluoro-5,8-di(thiophen-2-yl)quinoxaline (DTffQ)-based large band-gap polymers, namely P(BDTO-DTffQ), P(BDTT-DTffQ), and P(BDTSi-DTffQ), incorporating benzo[1,2-b:4,5-b 0 ]dithiophene (BDT) derivatives with different substituents, such as 2-butyloctyloxy (BOO), 5-(2-butyloctyl)thiophen-2-yl (BOT), and triisopropylsilylethynyl (TIPS), on its 4th and 8th positions for NFA-OSCs.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, we attempted to fabricate large‐bandgap polymeric donors for the NFA‐OSCs. The highly planar and strong electron‐accepting nature of heteroaromatic‐quinoxaline (Q) units have made them promising π‐conjugates for developing efficient polymeric donors for OSCs 24–28 . Noticeably, a variety of quinoxaline‐based polymers have been investigated in fullerene (PC 70 BM)‐based OSCs, and these polymers exhibited intense absorption in the UV region along with a deep HOMO level, high crystallinity, and good energy conversion efficiency of up to 9% 24–28 .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photovoltaic performance for quinoxaline‐based polymeric donor via backbone engineering for non‐fullerene organic solar cells

Agneeswari

Ahn

Tamilavan

et al. 2022

Bulletin Korean Chem Soc

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Herein, we demonstrate a facile technique for transforming a low‐energy‐converting quinoxaline‐based polymer into an efficient polymeric donor for non‐fullerene acceptor‐based organic solar cells (NFA‐OSCs). Alternating copolymers, namely P(BDTSi‐DTfQ), incorporating electron‐rich 4,8‐bis(triisopropylsilylethynyl)‐benzo[1,2‐b:4,5‐′]dithiophene (BDTSi) and electron‐deficient 2,3‐didodecyl‐6‐fluoro‐5,8‐di(thiophen‐2‐yl)quinoxaline (DTfQ) units were synthesized. The properties of P(BDTSi‐DTfQ) were thoroughly studied and briefly compared to those of the reported polymers, namely P(BDTSi‐DTffQ), made up of BDTSi and 2,3‐didodecyl‐6,7‐difluoro‐5,8‐di(thiophen‐2‐yl)quinoxaline (DTffQ) units. Polymer P(BDTSi‐DTfQ) exhibited a lower bandgap (Eg) and higher highest occupied and lowest unoccupied energy levels (HOMO and LUMO) than P(BDTSi‐DTffQ). The estimated Eg and HOMO/LUMO for P(BDTSi‐DTfQ) were 1.90 eV and −5.46 eV/−3.56 eV, respectively, and for P(BDTSi‐DTffQ) the same were 1.94 eV and −5.58 eV/−3.64 eV, respectively. Interestingly, the NFA‐OSCs made from P(BDTSi‐DTfQ) as the donor and NFA, namely ITIC, as the acceptor, gave a power conversion efficiency (PCE) of 3.68%, which is much higher than the PCE obtained (⁓0.75%) for the OSCs prepared by using the P(BDTSi‐DTffQ):ITIC blend. Noticeably, the energy levels of P(BDTSi‐DTfQ) were found to be favorable for efficient charge separation when it was blended with ITIC. This blend not only allowed a better charge separation at the donor/acceptor interfaces but also significantly lowered bimolecular recombination. The overall effect was to provide a higher PCE. However, P(BDTSi‐DTffQ) showed mismatched energy levels with ITIC resulting in a higher bimolecular recombination and lower PCE.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced photovoltaic performance for quinoxaline‐based polymeric donor via backbone engineering for non‐fullerene organic solar cells

Agneeswari

Ahn

Tamilavan

et al. 2022

Bulletin Korean Chem Soc

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“…[24] of our group has a very strong self‐orientation ability. Generally, those D−A polymers containing quinoxaline units are too easy to crystallize, [26] which make it difficult to evaluate objectively the ability of the additive to induce crystallization of the polymers. Whereas most of the D−A photovoltaic polymers have poor crystallization ability.…”

Section: Introductionmentioning

confidence: 99%

Polymer Additive SBS: More Sensitive to Fluorinated Asymmetric‐Indenothiophene‐Based Polymer Solar Cells

Jiang

Yang

et al. 2021

ChemistrySelect

Self Cite

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Polymer solar cells (PSCs) typically suffer from a negative effect of the residual solvent on the performance due to the use of the solvent processing additive. One solution to solve this problem is to use a solid polymer additive that can promote the phase separation of the blend film of the active layers. In this work, two new D−A type photovoltaic polymers, namely PIT‐DTBT and PIT‐DTffBT, based on asymmetric indenothiophene (IT) donor unit and nonfluorinated or difluorinated benzothiadiazole acceptor unit were designed and synthesized, respectively. Then a triblock copolymer, poly(styrene‐block‐butadiene‐block‐styrene) (SBS), was employed as a polymer additive into the active layers of PIT‐DTBT/PC71BM and PIT‐DTffBT/PC71BM based devices, and the SBS effect on the morphology of the blend films of the active layers, and then the performance of the two kinds of devices was investigated. The results demonstrated that the addition of SBS improved the molecule packing and induced the crystallization of PIT‐DTffBT, making the device have higher charge mobilities, more efficient charge dissociation and collection, and less charge recombination. Thus, power conversion efficiency (PCE) was increased from 4.61 % to 6.57 % for PIT‐DTffBT based device. Although almost no improvement in molecule packing and crystallization was observed for SBS‐treated nonfluorinated PIT‐DTBT, the fact of PCE of the PIT‐DTBT based device increased from 2.94 % to 3.13 % can also be attributed to the improved phase separation of the blend film by SBS. These findings indicate that SBS is more sensitive to fluorinated polymers than nonfluorinated polymers in improving molecule packing and inducing crystallization.

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Research progress and application of high efficiency organic solar cells based on benzodithiophene donor materials

Lin,

Peng,

Shi

et al. 2024

Exploration

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In recent decades, the demand for clean and renewable energy has grown increasingly urgent due to the irreversible alteration of the global climate change. As a result, organic solar cells (OSCs) have emerged as a promising alternative to address this issue. In this review, we summarize the recent progress in the molecular design strategies of benzodithiophene (BDT)‐based polymer and small molecule donor materials since their birth, focusing on the development of main‐chain engineering, side‐chain engineering and other unique molecular design paths. Up to now, the state‐of‐the‐art power conversion efficiency (PCE) of binary OSCs prepared by BDT‐based donor materials has approached 20%. This work discusses the potential relationship between the molecular changes of donor materials and photoelectric performance in corresponding OSC devices in detail, thereby presenting a rational molecular design guidance for stable and efficient donor materials in future.

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High photovoltaic performance of as-cast devices based on new quinoxaline-based donor–acceptor copolymers

Abstract: Two new quinoxaline-based copolymers with different alkylthio side chains show high photovoltaic performance in as-cast devices.

Cited by 13 publications

References 43 publications

Enhanced photovoltaic performance for quinoxaline‐based polymeric donor via backbone engineering for non‐fullerene organic solar cells

Enhanced photovoltaic performance for quinoxaline‐based polymeric donor via backbone engineering for non‐fullerene organic solar cells

Polymer Additive SBS: More Sensitive to Fluorinated Asymmetric‐Indenothiophene‐Based Polymer Solar Cells

Research progress and application of high efficiency organic solar cells based on benzodithiophene donor materials

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