Rational control of sequential morphology evolution and vertical distribution toward 17.18% efficiency all-small-molecule organic solar cells

Sun, Yanna; Li, Nian; Kan, Yuanyuan; Ren, Yi; Chen, Zhihao; Zhu, Lei; Zhang, Ming; Yin, Hang; Xu, Huajun; Li, Jianfeng; Xin, Hao; Liu, Feng; Gao, Ke; Li, Yuliang

doi:10.1016/j.joule.2022.10.005

Cited by 109 publications

(88 citation statements)

References 56 publications

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“…The strategy of quasi-orthogonal solvent processing is believed to be favorable for improving the vertical component distribution in pseudo-bilayer blends. 47 A higher PCE of 18.8% is achieved due to an improved J SC of 27.8 mA cm −2 and a further increased FF of 78.9% (Table 1), which is among the highest efficiencies reported for binary OPV devices. The histogram of PCE for 12 individual devices validates the good reproducibility of D18:3-ClTh-based devices (Figure 3c).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

et al. 2023

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Organic photovoltaics (OPVs) have achieved great progress in recent years due to delicately designed non-fullerene acceptors (NFAs). Compared with tailoring of the aromatic heterocycles on the NFA backbone, the incorporation of conjugated side-groups is a cost-effective way to improve the photoelectrical properties of NFAs. However, the modifications of side-groups also need to consider their effects on device stability since the molecular planarity changes induced by side-groups are related to the NFA aggregation and the evolution of the blend morphology under stresses. Herein, a new class of NFAs with local-isomerized conjugated side-groups are developed and the impact of local isomerization on their geometries and device performance/stability are systematically investigated. The device based on one of the isomers with balanced side- and terminal-group torsion angles can deliver an impressive power conversion efficiency (PCE) of 18.5%, with a low energy loss (0.528 V) and an excellent photo- and thermal stability. A similar approach can also be applied to another polymer donor to achieve an even higher PCE of 18.8%, which is among the highest efficiencies obtained for binary OPVs. This work demonstrates the effectiveness of applying local isomerization to fine-tune the side-group steric effect and non-covalent interactions between side-group and backbone, therefore improving both photovoltaic performance and stability of fused ring NFA-based OPVs.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

et al. 2023

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“…Through sequentially depositing donor and acceptor layers, the quasibilayer active layer is constructed for realizing effective LbL PSCs, deriving from the donor’s and acceptor’s high-purity domain for effective charge carrier transportation. The LbL PSCs present comparable performance with BHJ PSCs based on the same functional materials, signifying that the LbL method should be a promising alternative for realizing highly efficient PSCs. − The exciton diffusion distance is relatively limited in organic materials, many efforts have been devoted to enlarging component interdiffusion between donor and acceptor layers for further performance improvement of LbL PSCs. − For instance, Huang et al incorporated a solvent additive DIO into acceptor solution to enhance the interdiffusion region between the donor and the acceptor, leading to more efficient exciton dissociation that contributes to over 17% power conversion efficiency (PCE) in PM6/Y6:PC 71 BM-based LbL PSCs . The mixed solvent strategy was employed by Hou et al to control the PBDB-TFS1 and IT-4F interdiffusion, leading to enough D/A interfaces as well as a well-optimized nanoscale phase separation degree in LbL PSCs .…”

Section: Introductionmentioning

confidence: 99%

Over 18.1% Efficiency of Layer-by-Layer Polymer Solar Cells by Enhancing Exciton Utilization near the ITO Electrode

Zhang

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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In this work, layer-by-layer (LbL) polymer solar cells (PSCs) are constructed without/with the incorporation of a dissociation strengthening layer (DSL) on the basis of the wide-bandgap donor D18-Cl, as well as the narrow-bandgap nonfullerene acceptor Y6. The efficiency of LbL PSCs is enhanced from 17.62 to 18.15% through introducing a DSL, originating from the enhanced dissociation of D18-Cl excitons near the ITO electrode. Meanwhile, the interfacial energy between D18-Cl and Y6 layers is decreased by incorporating a DSL, which should facilitate molecular interdiffusion for more adequate exciton dissociation in LbL active layers. This work offers a simple and resultful way for realizing power conversion efficiency (PCE) improvement of LbL PSCs with maximized exciton utilization in LbL active layers. The universality of the DSL incorporation strategy on performance improvement can be further confirmed with a boosted PCE from 17.39 to 18.03% or from 17.13 to 17.61% for D18-Cl/L8-BO-or D18-Cl/N3-based LbL PSCs by incorporating a DSL.

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“…Over the past few decades, organic photovoltaic (OPV) devices 1 have attracted significant attention from researchers due to their unique advantages of being light weight, low cost, easy to process, and flexible. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Typically, the active layer of OPV devices consists of a donor (D) material and an acceptor (A) material, resulting in a narrow absorption spectrum that is difficult to match with sunlight.…”

Section: Introductionmentioning

confidence: 99%

Efficient ternary organic photovoltaic device with a non-halogenated solvent via synergistic inhibiting charge recombination and regulating morphology

et al. 2023

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Rational control of sequential morphology evolution and vertical distribution toward 17.18% efficiency all-small-molecule organic solar cells

Cited by 109 publications

References 56 publications

Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

Over 18.1% Efficiency of Layer-by-Layer Polymer Solar Cells by Enhancing Exciton Utilization near the ITO Electrode

Efficient ternary organic photovoltaic device with a non-halogenated solvent via synergistic inhibiting charge recombination and regulating morphology

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