Fused-heterocycle engineering on asymmetric non-fullerene acceptors enables organic solar cells approaching 29 mA/cm2 short-circuit current density

Song, Yuanxia; Zhong, Ziping; Li, Ling; Liu, Xin; Huang, Jijia; Wu, Hao; Li, Ming; Lu, Zhenhuan; Yu, Jiangsheng; Hai, Jiefeng

doi:10.1016/j.cej.2021.132830

Cited by 25 publications

(25 citation statements)

References 60 publications

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“…The optical bandgap ( E g opt = 1240/λ onset ) of TPQ-eC7-4F, TPQ-eC7-4Cl, and BTP-eC7-4Cl are 1.38, 1.34, and 1.34 eV, respectively, which are calculated from the λ onset edges of 898, 924, and 924 nm, respectively (Figure c). In addition, the PBDB-T:TPQ-eC7-4F, PBDB-T:TPQ-eC7-4Cl, and PBDB-T:BTP-eC7-4Cl blend films are 870, 895, and 897 nm, respectively, indicating that the trend of the blend film onset values follows the trend of their neat film onset values (Figure d) . The higher molar extinction coefficient of the PBDB-T:TPQ-eC7-4F blend in the film state absorption spectrum is also observed.…”

Section: Resultsmentioning

confidence: 69%

“…In addition, the PBDB-T:TPQ-eC7-4F, PBDB-T:TPQ-eC7-4Cl, and PBDB-T:BTP-eC7-4Cl blend films are 870, 895, and 897 nm, respectively, indicating that the trend of the blend film onset values follows the trend of their neat film onset values (Figure 3d). 48 The higher molar extinction coefficient of the PBDB-T:TPQ-eC7-4F blend in the film state absorption spectrum is also observed. These features reveal that TPQ-eC7-4F has better molecular packing with the PBDB-T, indicating that the PBDB-T:TPQ-eC7-4F active layer can capture more photons.…”

Section: Table 1 Optical and Electrochemical Data Of Tpq-ec7-4f And T...mentioning

confidence: 79%

“…The photovoltaic performances of PBDB-T-based OSCs, however, are lower than those for the PM6-based OSCs owing to their up-shifting highest occupied molecular orbital (HOMO) energy levels . The PCEs of the highly efficient PBDB-T-based single-junction binary-OSCs are lying between 12 to 15% . For example, Li and co-workers reported two NFAs with extending end-group; the corresponding OSC devices based on PBDB-T:BTTPC and PBDB-T:BTTPC-Br afforded PCEs of 14.51 and 15.22%, respectively .…”

Section: Introductionmentioning

confidence: 99%

“…47 The PCEs of the highly efficient PBDB-T-based single-junction binary-OSCs are lying between 12 to 15%. 48 For example, Li and co-workers reported two NFAs with extending end-group; the corresponding OSC devices based on PBDB-T:BTTPC and PBDB-T:BTTPC-Br afforded PCEs of 14.51 and 15.22%, respectively. 49 Huang and co-workers reported two NFAs, named H1 and H2 (analogues of Y6) with F-and Cl-atoms on the terminal acceptor IC-unit, respectively; the corresponding PBDB-T:H1-and PBDB-T:H2-based OSC devices delivered PCEs of 14.06 and 15.12%, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

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PBDB-T-Based Binary-OSCs Achieving over 15.83% Efficiency via End-Group Functionalization and Alkyl-Chain Engineering of Quinoxaline-Containing Non-Fullerene Acceptors

Busireddy

Chen

Huang

et al. 2022

ACS Appl. Mater. Interfaces

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Molecular backbone modification, alkyl-chain engineering, and end-group functionalization are promising strategies for developing efficient high-performance non-fullerene acceptors (NFAs). Herein, two new NFAs, named TPQ-eC7-4F and TPQ-eC7-4Cl, are designed and synthesized. Both molecules have linear octyl chains on fused quinoxaline-containing heterocyclics as the central backbone and difluorinated (2F)/dichlorinated (2Cl) 1,1-dicyanomethylene-3-indanone (IC) as the end-group units. The influences of alkyl-chains on fused quinoxaline backbone and different halogenated end-groups on optical, electrochemical, and photovoltaic performances of organic solar cells (OSCs) are studied. In comparison with TPQ-eC7-4Cl, TPQ-eC7-4F exhibits blue-shifted absorptions with higher molar extinction coefficients in the film state as well as in the donor/acceptor (D/A) blend film state and up-shifting lowest unoccupied molecular orbital (LUMO) energy level. As a result, the OSC devices based on the PBDB-T:TPQ-eC7-4F display an outstanding power conversion efficiency (PCE) of 15.83% with a simultaneously increased open-circuit voltage (V oc) of 0.85 V, a short-circuit current-density (J sc) of 25.89 mA cm–2, and a fill factor (FF) of 72.20%, whereas the PBDB-T:TPQ-eC7-4Cl-based OSC device shows a decent PCE of 14.48% with a V oc of 0.84 V, a J sc of 24.56 mA/cm2, and an FF of 69.77%. To the best of our knowledge, this is the highest photovoltaic performance of PBDB-T-based single-junction binary-OSCs. In comparison, ascribed to the high crystallinity and low solubility of BTP-eC7-4Cl, the corresponding PBDB-T:BTP-eC7-4Cl-based OSC device shows poor photovoltaic performance (PCE of 11.87%). The experimental results demonstrate that fine-tuning the fused quinoxaline backbone with alkyl-chain and end-group functionalization are promising strategies to construct high-performance NFAs for PBDB-T-based single-junction binary-OSCs.

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Section: Resultsmentioning

confidence: 69%

Section: Table 1 Optical and Electrochemical Data Of Tpq-ec7-4f And T...mentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

PBDB-T-Based Binary-OSCs Achieving over 15.83% Efficiency via End-Group Functionalization and Alkyl-Chain Engineering of Quinoxaline-Containing Non-Fullerene Acceptors

Busireddy

Chen

Huang

et al. 2022

ACS Appl. Mater. Interfaces

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show abstract

“…The strategy may afford a prospective way to finish high-performance near-infrared OSCs. [71] In 2022, Min and co-workers reported a new asymmetric FREA BTP-2F2Cl with chlorinated and fluorinated endcapped groups, [72] displaying a broad and strong absorption spectrum with a narrow bandgap of 1.405 eV, and surface free energy (γ) and the Flory-Huggins interaction parameter (χ) demonstrated that PM1:BTP-2F2Cl showed the better miscibility. The BTP-2F2Cl thin-film exhibited the electron mobility of 8.80 × 10 -4 cm 2 V -1 s -1 by using SCLC measurements, GIWAXS measurements indicated that BTP-2F2Cl thin-film and PM1:BTP-2F2Cl showed better molecular stacking property.…”

Section: The Asymmetric End Groups-based Freasmentioning

confidence: 99%

Recent Progress of Y6‐Derived Asymmetric Fused Ring Electron Acceptors

Zhang

et al. 2022

Adv Funct Materials

135

102

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Symmetric conjugated molecules can be broken through suitable synthetic strategies to construct novel asymmetric molecules, which can largely broaden the material library. In the field of organic solar cells, fused‐ring electron acceptors (FREAs) with the A‐DA'D‐A type backbone structure have attracted much attention and enabled power conversion efficiencies (PCE) exceeding 18%. Among them, Y6 is one of the most classic FREAs that can derive many symmetric and asymmetric molecules and exhibit unique optoelectronic properties. Thus, in this review, the focus is on the recent progress of Y6‐derived asymmetric FREAs containing a dipyrrolobenzothiadiazole segment, which can be classified as the following three categories: asymmetric end group, asymmetric central core and asymmetric side chain. The relationship of the molecular structure, optoelectronic properties, and device performance is discussed in detail. Finally, the future design directions and challenges faced by this kind of photovoltaic materials are given.

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Selective Chemical Reactivity of Non‐Fullerene Acceptor for Photoelectrochemical Bioassay of Urease Activity

Xiao

Han

Lyu

et al. 2023

Adv Funct Materials

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Non‐fullerene acceptors (NFAs) are a crucial component of organic photovoltaics, and they have gained significant attention due to their outstanding photoelectric conversion efficiency. However, the recognition reactions of specific building blocks in NFAs are largely overlooked in the construction of photoelectrochemical (PEC) biosensing platforms. In this study, the potential of Y6, a prototype NFA, is explored to construct a sensitive PEC biosensor for monitoring urease activity due to the selective chemical reactivity of its organic building blocks. The resultant biosensor relies on the urease‐mediated enzymatic reaction, which produces OH− anions that act as a nucleophilic reagent for the linkage of C═C in the Y6 moiety. This results in the formation of Y6‐OH, which exhibits a depressive photoelectric response due to the destroyed conjugated structure and intramolecular charge transfer. As expected, a linear relationship is observed between the recession of photoelectric performance and the concentration of urease, with good sensitivity and selectivity. Furthermore, urease activity detection is also successfully realized in human saliva samples, suggesting the promising potential of NFA‐based PEC biosensors for clinical applications even in the absence of common biological recognition units.

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Fused-heterocycle engineering on asymmetric non-fullerene acceptors enables organic solar cells approaching 29 mA/cm2 short-circuit current density

Cited by 25 publications

References 60 publications

PBDB-T-Based Binary-OSCs Achieving over 15.83% Efficiency via End-Group Functionalization and Alkyl-Chain Engineering of Quinoxaline-Containing Non-Fullerene Acceptors

PBDB-T-Based Binary-OSCs Achieving over 15.83% Efficiency via End-Group Functionalization and Alkyl-Chain Engineering of Quinoxaline-Containing Non-Fullerene Acceptors

Recent Progress of Y6‐Derived Asymmetric Fused Ring Electron Acceptors

Selective Chemical Reactivity of Non‐Fullerene Acceptor for Photoelectrochemical Bioassay of Urease Activity

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