Efficient Organic Solar Cells from Molecular Orientation Control of M-Series Acceptors

Ma, Yunlong; Zhang, Ming; Wan, Shuo; Yin, Pan; Wang, Pengsong; Cai, Dongdong; Liu, Feng; Zheng, Qingdong

doi:10.1016/j.joule.2020.11.006

Cited by 209 publications

(174 citation statements)

References 47 publications

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“…On the one hand, the conjugated backbones in these building blocks should be planar and rigid, which is beneficial for π-electron delocalization and intramolecular charge transport. As these fused-ring building blocks, all contain a few sulfur-and/or nitrogen-heteroaromatic five-membered rings and thus are electron-rich 4 , 8 , 17 , a strong intramolecular charge transfer (ICT) effect can be formed when they conjugately link with the electron-deficient end-capping groups, which endows the flexibilities in modulating absorption spectra and molecular energy levels of the NFAs 24 – 27 . On the other hand, the bulky alkyls on the fused-ring building blocks not only guarantee good solubilities of the NFAs 25 , 27 , 28 but also ensure the intermolecular π−π stacking of the NFAs to mainly occur at the end-capping groups, because such a molecular packing mode is crucial for their electron-accepting capability 19 , 20 , 29 – 31 .…”

Section: Introductionmentioning

confidence: 99%

Completely non-fused electron acceptor with 3D-interpenetrated crystalline structure enables efficient and stable organic solar cell

et al. 2021

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Non-fullerene acceptors (NFAs) based on non-fused conjugated structures have more potential to realize low-cost organic photovoltaic (OPV) cells. However, their power conversion efficiencies (PCEs) are much lower than those of the fused-ring NFAs. Herein, a new bithiophene-based non-fused core (TT-Pi) featuring good planarity as well as large steric hindrance was designed, based on which a completely non-fused NFA, A4T-16, was developed. The single-crystal result of A4T-16 reveals that a three-dimensional interpenetrating network can be formed due to the compact π–π stacking between the adjacent end-capping groups. A high PCE of 15.2% is achieved based on PBDB-TF:A4T-16, which is the highest value for the cells based on the non-fused NFAs. Notably, the device retains ~84% of its initial PCE after 1300 h under the simulated AM 1.5 G illumination (100 mW cm−2). Overall, this work provides insight into molecule design of the non-fused NFAs from the aspect of molecular geometry control.

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Section: Introductionmentioning

confidence: 99%

Completely non-fused electron acceptor with 3D-interpenetrated crystalline structure enables efficient and stable organic solar cell

et al. 2021

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“…The strong (100) peak locates at q xy ≈ 0.28 Å −1 in the in‐plane (IP) direction (lamellar stacking) and the significant (010) peak at q z ≈ 1.76 Å −1 in the out‐of‐plane (OOP) direction (π–π stacking) indicate that the (w/o) blend film manifests a distinct face‐on orientation. [ 32 ] When the solvent additive CN is added into PM6:Y6, the intensities in both the IP direction and the OOP direction have been enhanced. The identical position of the diffraction peaks indicates the film remain pristine molecular orientation, whereas the enhanced intensity exhibits the film with a stronger crystallinity.…”

Section: Resultsmentioning

confidence: 99%

Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells

You

Zhou

et al. 2021

Solar RRL

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It is incredibly feasible and effective to adopt a solid additive strategy to optimize the active layer blend films morphology for nonfullerene organic solar cells (OSCs) to achieve high efficiency and stable performance. Herein, a novel amorphous small molecule SJ‐IC‐M with a comparatively high molecular weight is first designed and used as an efficient solid additive in the OSCs based on PM6:Y6 to enhance the power conversion efficiency (PCE) and long‐term stability of the device. After the addition of 0.5 wt% SJ‐IC‐M into the active layer blends, the PCE can be increased to 16.2% compared with that of the reference device without additive displaying an inferior PCE of 15.0%. Moreover, the device containing the SJ‐IC‐M additive delivers more excellent long‐term stability. The PCE can remain over 90% of its initial value when the unencapsulated device is preserved in a N2‐filled glovebox for a month. Systematic analysis reveals that the introduction of the relatively high molecular weight amorphous SJ‐IC‐M additive can optimize the crystallinity of Y6. As a result, an improved charge transport, stabilized blend morphology, and enhanced device performance are achieved. Moreover, the current research provides a new strategy which can replace the commonly used solvent additive to fabricate efficient and stable nonfullerene OSCs.

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“…Generally, the optoelectronic properties and packing structures of NFAs can be regulated by changing the central D and terminal A units [15,16] . As a result, NFAs have rapidly led the development of OSCs in recent years [17] and the PCEs of OSCs based on A-D-A-type NFAs have surpassed 16% [18,19] . More encouragingly, Y6, a superior NFA with 2,1,3-benzothiadiazole (BT) as the central electron-deficient core in the A-DA'D-A structure was proposed by Yuan et al [20] in 2019, which demonstrated a remarkable PCE of 15.7% in its first report.…”

Section: Introductionmentioning

confidence: 99%

Non-fused ring acceptors for organic solar cells

Yang¹,

Wu²,

Zhou³

et al. 2022

Energy Mater

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Organic solar cells (OSCs) have experienced rapid development and achieved significant breakthroughs in power conversion efficiencies owing to the emergence of non-fullerene acceptors (NFAs) with ladder-type multiple fused ring structures. However, the high synthetic complexity and production cost of multiple fused ring NFAs hinder the commercial prospects of OSCs. In this context, the development of non-fused ring acceptors (NFRAs) with simple structures and facile synthesis has been proposed. In this mini review, we summarize the important progress in this field spanning from molecular design strategies to structure-performance relationships. Ultimately, with the aim of realizing the practical application of NFRAs in OSCs, we discuss the current challenges and future directions in terms of achieving high performance and low synthetic complexity simultaneously. These discussions provide valuable insights into the development of new NFRAs.

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Efficient Organic Solar Cells from Molecular Orientation Control of M-Series Acceptors

Cited by 209 publications

References 47 publications

Completely non-fused electron acceptor with 3D-interpenetrated crystalline structure enables efficient and stable organic solar cell

Completely non-fused electron acceptor with 3D-interpenetrated crystalline structure enables efficient and stable organic solar cell

Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells

Non-fused ring acceptors for organic solar cells

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