Reducing steric hindrance around electronegative atom in polymer simultaneously enhanced efficiency and stability of organic solar cells

Jiang, Qiuju; Han, Pengwei; Ning, Haijun; Jiang, Jiaquan; Chen, Hui; Xiao, Yonghong; Ye, Chun-Rong; Chen, Jin‐Ming; Lin, Man; He, Feng; Huang, Xiao‐Chun; Wu, Qinghe

doi:10.1016/j.nanoen.2022.107611

Cited by 18 publications

(25 citation statements)

References 46 publications

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“…The benchmark polymer PM6- and D18-based photovoltaic devices were fabricated for comparison. The highest efficiencies for PM6:eC9- and D18:eC9-based OSC are 17.68 and 16.23%, respectively, which are similar to the reported results. , We summarized the decent efficiency for various imide (TPD, − PhI, , BTI, − TzBI, − DPI, , NTI − )-based polymer donors. As shown in Figure d, PNDT2 exhibits a champion efficiency among imide-based polymer donors.…”

Section: Resultssupporting

confidence: 87%

“…Owing to the advantages of ease in synthesis, chemical robustness, and strong electron withdrawing ability, , various imides, e.g., TPD, − PhI, , BTI, − TzBI, − DPI, , and NTI − (the chemical structure in Figure a), have been used to construct polymer donors. Recently, we developed a naphtho[2,1-b:3,4-b′]dithiophene-5,6-imide (NDTI)-based building unit, which has a large conjugated backbone .…”

Section: Introductionmentioning

confidence: 99%

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Manipulating the Alkyl Chains of Naphthodithiophene Imide-Based Polymers to Concurrently Boost the Efficiency and Stability of Organic Solar Cells

Su,

Lin,

et al. 2023

ACS Appl. Mater. Interfaces

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Morphology instability holds the major responsibility for efficiency degradation of organic solar cells (OSCs). However, how to develop polymer donors simultaneously with high efficiency and excellent morphology stability remains challenging. Herein, we reported naphtho[2,1-b:3,4-b′]dithiophene-5,6-imide (NDTI)-based new polymers PNDT1 and PNDT2. The alkyl chain engineering leads to high crystallinity, high hole mobility (>10–3 cm2 V–1 S–1), and nanofibrous film morphology, which enable PNDT2 to exhibit an efficiency of 18.13% and a remarkable FF value of 0.80. Moreover, the NDTIs have short π–π stacking and abundant short interactions, and their polymers exhibit superior morphological stability. Therefore, the PNDT2-based OSCs exhibit much better device stability than that of PNDT1, PAB-α, and benchmark polymers PM6 and D18. This work suggests the great importance of the large conjugated backbone of the monomer and alkyl chain engineering to develop high-performance and morphology-stable polymers for OSCs.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Manipulating the Alkyl Chains of Naphthodithiophene Imide-Based Polymers to Concurrently Boost the Efficiency and Stability of Organic Solar Cells

Su,

Lin,

et al. 2023

ACS Appl. Mater. Interfaces

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“…[110] Recently, the PCEs of all-polymer OSCs have been increased to over 17%, mainly benefiting from the optimization of FREA structures. [111][112][113][114][115][116] Inspired by this, the polymerization of NFREAs may offer an excellent platform for reducing the cost of all-polymer OSCs, which is important for the industrialization of all-polymer OSCs technology. Very recently, Huang and Duan groups independently carried out the NFREA polymerization strategy.…”

Section: Nfreas-based All-polymer Oscsmentioning

confidence: 99%

Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

Bai

Liang

et al. 2022

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The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have improved considerably in recent years with the development of fused-ring electron acceptors (FREAs). Currently, FREAs-based OSCs have achieved high PCEs of over 19% in single-junction OSCs. Whereas the relatively high synthetic complexity and the low yield of FREAs typically result in high production costs, hindering the commercial application of OSCs. In contrast, noncovalently fused-ring electron acceptors (NFREAs) can compensate for the shortcomings of FREAs and facilitate large-scale industrial production by virtue of the simple structure, facile synthesis, high yield, low cost, and reasonable efficiency. At present, OSCs based on NFREAs have exceeded the PCEs of 15% and are expected to reach comparable efficiency as FREAs-based OSCs. Here, recent advances in NFREAs in this review provide insight into improving the performance of OSCs. In particular, this paper focuses on the effect of the chemical structures of NFREAs on the molecule conformation, aggregation, and packing mode. Various molecular design strategies, such as core, side-chain, and terminal group engineering, are presented. In addition, some novel polymer acceptors based on NFREAs for all-polymer OSCs are also introduced. In the end, the paper provides an outlook on developing efficient, stable, and low-cost NFREAs for achieving commercial applications.

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“…[2] However, very limited polymers could perfectly meet these requirements and how to design new polymers with desired properties remains challenging. [3] In D-A co-polymers, the electron-deficient unit significantly affects the photophysical and film-forming properties of the polymer. [4] For example, 3-fluorothieno- [3,4-b]thiophene-2-carboxylate based PTB7-Th bears narrow band gap, [5] benzo [1,2-c : 4,5-c']dithiophene-4,8-dione based PM6 exhibits medium band gap and high crystallinity.…”

Section: Introductionmentioning

confidence: 99%

A Multifluorination Strategy Toward Wide Bandgap Polymers for Highly Efficient Organic Solar Cells

Chen

et al. 2023

Angew Chem Int Ed

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Creating new electron‐deficient unit is highly demanded to develop high‐performance polymer donors for non‐fullerene organic solar cells (OSCs). Herein, we reported a multifluorinated unit 4,5,6,7‐tetrafluoronaphtho[2,1‐b : 3,4‐b′]dithio‐phene (FNT) and its polymers PFNT‐F and PFNT‐Cl. The advantages of multifluorination: (1) it enables the polymers to exhibit low‐lying HOMO (≈−5.5 eV) and wide band gap (≈2.0 eV); (2) the short interactions (F⋅⋅⋅H, F⋅⋅⋅F) endow the polymers with properties of high film crystallinity and efficient hole transport; (3) well miscibility with NFAs that leads to a more well‐defined nanofibrous morphology and face‐on orientation in the blend films. Therefore, the PFNT‐F/Cl : N3 based OSCs exhibit impressive FF values of 0.80, and remarkable PCEs of 17.53 % and 18.10 %, which make them ranked the best donor materials in OSCs. This work offers new insights into the rational design of high‐performance polymers by multifluorination strategy.

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Reducing steric hindrance around electronegative atom in polymer simultaneously enhanced efficiency and stability of organic solar cells

Cited by 18 publications

References 46 publications

Manipulating the Alkyl Chains of Naphthodithiophene Imide-Based Polymers to Concurrently Boost the Efficiency and Stability of Organic Solar Cells

Manipulating the Alkyl Chains of Naphthodithiophene Imide-Based Polymers to Concurrently Boost the Efficiency and Stability of Organic Solar Cells

Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

A Multifluorination Strategy Toward Wide Bandgap Polymers for Highly Efficient Organic Solar Cells

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