Non-conjugated polymers as thickness-insensitive electron transport materials in high-performance inverted organic solar cells

Zhang, Zhiquan; Zhang, Zheling; Yu, Yufu; Zhao, Bin; Li, Sheng; Zhang, Jian; Tan, Songting

doi:10.1016/j.jechem.2019.12.011

Cited by 38 publications

(33 citation statements)

References 51 publications

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“…The better charge collection properties in an aqueous solution were explained to the passivation of the reactivity of the interfacial layer and NF acceptor via amino‐group protonation (Figure 9A–D). Recently, Zhang et al 189 introduced polyelectrolyte with 1,8‐dibromooctane, PEIE‐BDO as work‐function modifier in NF‐OSCs. The material permitted a work function of ITO to 3.9 eV which is more appropriate for electron extraction and minimize the energy loss due to better energy level alignment at the interface.…”

Section: Cathode Interlayer Materialsmentioning

confidence: 99%

“…Low‐cost and low‐temperature processible nonconjugated polymers such as PEIE and PEI are usually used as ultrathin (<10 nm) CILs in OSCs due to their insulating nature. Zhang et al 189 introduced two nonconjugated polymers PEIE‐DBO and PEIE‐DCO as CILs in inverted OSCs and investigated the effect of halogen anion on charge extraction properties. The higher PCE of 10.52%, 9.45%, and 0.09% was achieved with PEIE‐DBO interlayer at the thickness of 9, 35, and 50 nm, respectively.…”

Section: Scale‐up Techniquesmentioning

confidence: 99%

“…(A) The schematic diagram of PEIE‐DBO and PEIE‐DCO. Reproduced with permission: Copyright 2019, Elsevier Ltd 189 (B) Schematic illustration of the blade‐coating process and J–V curve of devices using blade‐coated NDI‐N as cathode interlayer.…”

Section: Scale‐up Techniquesmentioning

confidence: 99%

“…Importantly, the device showed a comparative PCE of 10.0% even with a F I G U R E 1 5 (A) The schematic diagram of PEIE-DBO and PEIE-DCO. Reproduced with permission: Copyright 2019, Elsevier Ltd. 189 (B) Schematic illustration of the blade-coating process and J-V curve of devices using blade-coated NDI-N as cathode interlayer. Reproduced with permission: Copyright 2018, Elsevier Ltd. 237 (C) Deposition techniques that are partly or fully scalable.…”

Section: Scale-up Techniquesmentioning

confidence: 99%

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Recent progress in cathode interlayer materials for non‐fullerene organic solar cells

Ahmad

Zhou

Fan

et al. 2021

EcoMat

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Non‐fullerene acceptors are currently a hot research area in the development of organic solar cells (OSCs). At present, the‐state‐of‐the‐art power conversion efficiency (PCE) of non‐fullerene organic solar cells (NF‐OSCs) with single and multiple‐junction has surpassed 18% and 19%, respectively. The cathode interlayer (CIL) plays a significant role in the improvement of PCE and the stability of OSCs. Recently, a large number of CIL materials have been employed in OSCs. This review summarizes the recent progress of CIL materials and systematically describes their impact on the device efficiency and stability in single‐junction NF‐OSCs. Firstly, the functions, key requirements, and distinctive features of CILs when used in NF‐OSCs are summarized. Afterward, some big families of materials including metal oxides, metal salts/complexes, small molecules, polymers, composites/hybrids are presented as CIL for NF‐OSCs. Finally, the scale‐up techniques, conclusion, and future challenges regarding CIL in NF‐OSCs are elucidated.

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Section: Cathode Interlayer Materialsmentioning

confidence: 99%

Section: Scale‐up Techniquesmentioning

confidence: 99%

Section: Scale‐up Techniquesmentioning

confidence: 99%

Section: Scale-up Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Recent progress in cathode interlayer materials for non‐fullerene organic solar cells

Ahmad

Zhou

Fan

et al. 2021

EcoMat

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show abstract

“…[ 1,2 ] A major factor in this rise in performance has been credited to the introduction of the “Y‐series” NFAs, in particular the molecule Y6, which enabled a significant leap forward in OSCs to achieve over 15% PCE in 2019. [ 3,4 ] As a consequence of these impressive results, an explosion of work is currently underway to i) understand the fundamental physics that govern the high performance of Y6 and its derivatives in OSCs, [ 2,5–31 ] ii) unravel the role of morphology and packing interactions on the device performance, and iii) extend this knowledge to design and develop NFA‐based bulk heterojunction (BHJ) blends that achieve efficient OSCs with record PCEs. [ 8,32,33 ]…”

Section: Introductionmentioning

confidence: 99%

Resolving Atomic‐Scale Interactions in Nonfullerene Acceptor Organic Solar Cells with Solid‐State NMR Spectroscopy, Crystallographic Modelling, and Molecular Dynamics Simulations

et al. 2021

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Fused‐ring core nonfullerene acceptors (NFAs), designated “Y‐series,” have enabled high‐performance organic solar cells (OSCs) achieving over 18% power conversion efficiency (PCE). Since the introduction of these NFAs, much effort has been expended to understand the reasons for their exceptional performance. While several studies have identified key optoelectronic properties that govern high PCEs, little is known about the molecular level origins of large variations in performance, spanning from 5% to 18% PCE, for example, in the case of PM6:Y6 OSCs. Here, a combined solid‐state NMR, crystallography, and molecular modeling approach to elucidate the atomic‐scale interactions in Y6 crystals, thin films, and PM6:Y6 bulk heterojunction (BHJ) blends is introduced. It is shown that the Y6 morphologies in BHJ blends are not governed by the morphology in neat films or single crystals. Notably, PM6:Y6 blends processed from different solvents self‐assemble into different structures and morphologies, whereby the relative orientations of the sidechains and end groups of the Y6 molecules to their fused‐ring cores play a crucial role in determining the resulting morphology and overall performance of the solar cells. The molecular‐level understanding of BHJs enabled by this approach will guide the engineering of next‐generation NFAs for stable and efficient OSCs.

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Low‐Work‐Function PEDOT Formula as a Stable Interlayer and Cathode for Organic Solar Cells

Liu

Sun

Dong

et al. 2021

Adv Funct Materials

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Cathode with low work-function (WF) is a vital unit in optoelectronic devices. Yet, the stable cathode is still a big challenge. Here, PEDOT:PSS-TBA is reported among series of PEDOT:PSS-M, where PEDOT:PSS denotes poly(3,4ethylenedioxythiophene):poly(styrenesulfonate), M refers to monovalent cation and TBA is tetrabutylammonium specifically, as a stable cathode. The PEDOT:PSS-TBA is synthesized via ion exchange with WF of 4.1-4.2 eV and its conductivity can be improved to 300 S cm −1 by the additive. Meanwhile, PEDOT:PSS-TBA is stable even under plasma, heat, or isopropanol sonication. Organic solar cells (OSCs) are fabricated with indium tin oxide (ITO)/ PEDOT:PSS-TBA and highly conductive PEDOT:PSS-TBA (with additive, hc-PEDOT:PSS) electrodes respectively. The OSCs display superior stability than the reference with ITO/ZnO as the cathode. As a proof of concept, solution-processed OSCs are demonstrated with a three-layered structure (hc-PEDOT:PSS-TBA/active layer/PEDOT:PSS), which proves PEDOT:PSS-TBA as a promising cathode for printable optoelectronic with a simplified structure.

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Non-conjugated polymers as thickness-insensitive electron transport materials in high-performance inverted organic solar cells

Cited by 38 publications

References 51 publications

Recent progress in cathode interlayer materials for non‐fullerene organic solar cells

Recent progress in cathode interlayer materials for non‐fullerene organic solar cells

Resolving Atomic‐Scale Interactions in Nonfullerene Acceptor Organic Solar Cells with Solid‐State NMR Spectroscopy, Crystallographic Modelling, and Molecular Dynamics Simulations

Low‐Work‐Function PEDOT Formula as a Stable Interlayer and Cathode for Organic Solar Cells

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