Enhancing the Marangoni flow by inner side chain engineering in nonfullerene acceptors for reproducible blade coating-processed organic solar cell manufacturing

Park, Geunhyung; Cho, Yongjoon; Jeong, Seonghun; Park, Jeewon; Yoon, Seong‐Jun; Yang, Changduk

doi:10.1039/d3ta01806g

Cited by 12 publications

(6 citation statements)

References 71 publications

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“…compared to the control device (Table 1). The poorer FF value (Figure 3c) of the ADT-treated device compared to the control device is mainly due to the lower hole mobility (μ h , 5.13×10 À 4 cm 2 V À 1 s À 1 vs. 7.23×10 À 4 cm 2 V À 1 s À 1 ) and electron mobility (μ e , 4.21×10 À 4 cm 2 V À 1 s À 1 vs. 4.56×10 À 4 cm 2 V À 1 s À 1 , as shown in Figure 3d) and the larger energy loss [42][43] (E loss , 0.555 eV vs. 0.535 eV, Figure S9 and Table S10 in the Supporting Information). Relative to the control device, the treatment of ADT had slight effect in exciton dissociation probability (P diss ), carrier lifetime (τ) and bimolecular and trap-assistant charge recombination (as shown in Figure S10 in the Supporting Information).…”

Section: Angewandte Chemiementioning

confidence: 91%

Molecular Stacking and Aggregation Optimization of Photoactive Layer through Solid Additive Enables High‐Performance Organic Solar Cells

Zhang,

Wu,

et al. 2023

Angew Chem Int Ed

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Regulating molecular packing and aggregation of photoactive layer is a critical but challenging issue in developing high‐performance organic solar cells. Herein, two structurally similar analogues of anthra[2,3‐b : 6,7‐b′]dithiophene (ADT) and naphtho[1,2‐b : 5,6‐b′]dithiophene (NDT) are developed as solid additive to exploit their effect in regulating the molecular aggregation and π‐stacking of photoactive layer. We clarify that the perpendicular arrangements of NDT can enlarge the molecular packing space and improve the face‐on stacking of Y6 during the film formation, favoring a more compact and ordered long‐range π‐π stacking in the out‐of‐plane direction after the removal of NDT under thermal annealing. The edge‐to‐face stacked herringbone‐arrangement of ADT along with its non‐volatilization under thermal annealing can induce the coexistence of face‐on and edge‐on stacking of blend film. As a result, the NDT treatment shows encouraging effect in improving the photovoltaic performance of devices based on various systems. Particularly, a remarkable PCE of 18.85 % is achieved in the PM6 : L8‐BO‐based device treated by NDT additive, which is a significant improvement with regard to the PCE of 16.41 % for the control device. This work offers a promising strategy to regulate the molecular packing and aggregation of photoactive layer towards significantly improved performance and stability of organic solar cells.

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Section: Angewandte Chemiementioning

confidence: 91%

Molecular Stacking and Aggregation Optimization of Photoactive Layer through Solid Additive Enables High‐Performance Organic Solar Cells

Zhang,

Wu,

et al. 2023

Angew Chem Int Ed

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“…In general, the relationship between V oc and P light (illumination light intensity) is represented as V oc ∝ nKT / q ln( P light ) (where q , T , and K are the elementary charge, thermodynamic temperature, and the Boltzmann constant, respectively) to investigate carrier recombination. It can be seen in Figure b that the slope of the PY-FBTA-based device is 1.13 kT / q , while that of the PY-DPP-based device is 1.32 kT / q , suggesting less trap-assisted and monomolecular recombination in the PY-FBTA-based devices. , The affinity between J sc and P light is given by the function J sc ∝ P light α . The PY-FBTA-based device presents a larger α value (0.988) than that of the PY-DPP-based device (0.945) (Figure c), which indicates that there is more suppressed bimolecular recombination in the devices based on PY-FBTA .…”

Section: Resultsmentioning

confidence: 93%

“…It can be seen in Figure 7b that the slope of the PY-FBTA-based device is 1.13 kT/q, while that of the PY-DPP-based device is 1.32 kT/q, suggesting less trap-assisted and monomolecular recombination in the PY-FBTA-based devices. 55,56 The affinity between J sc and P light is given by the function J sc ∝ P light α . 57 The PY-FBTA-based device presents a larger α value (0.988) than that of the PY-DPP-based device (0.945) (Figure 7c), which indicates that there is more suppressed bimolecular recombination in the devices based on PY-FBTA.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

A–A Strategy Enables Desirable Performance of All-Polymer Solar Cells Fabricated with Nonhalogenated Solvents

Peng,

Wang,

et al. 2023

ACS Appl. Mater. Interfaces

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Most polymer acceptors have been designed by applying a D (electron-rich unit)–A (electron-deficient unit) strategy, which are principally processed with halogenated solvents to fabricate all-polymer solar cells (all-PSCs). Two novel polymer acceptors, containing an A–A type backbone, were designed and synthesized, which can be readily dissolved in o-xylene. The polymer PY-FBTA, comprising a Y6 derivative as the first A unit and a benzotriazole derivative as the second A unit, shows smaller dihedral angles in the backbone, stronger molecular interactions, higher LUMO level, more complementary absorption spectrum, and better morphology with PM6 than the polymer PY-DPP comprising a diketopyrrolopyrrole derivative as the second A unit. Accordingly, the PM6:PY-FBTA all-PSC achieves a higher PCE of 13.95% than the all-PSC based on PM6:PY-DPP (9.51%) for thoroughly improved J sc (22.34 mA cm–2), V oc (0.963 V), and FF (64.84%) values, which are fabricated with o-xylene as the solvent. This work demonstrates that the A–A structure is a desirable strategy for designing polymer acceptors for efficient all-PSCs prepared with nonhalogenated solvents.

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“…The second acceptors (guest acceptors) are almost as third component materials due to the good compatibility of the host donor and the host acceptor. 13 In contrast, it is more difficult to regulate the compatibility of the second donor and the host donor and coordinate the surface and bulk morphology of the ternary photoactive layer. Research on efficient ternary OPVs based on second donors as third component materials is summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the third component materials play the role of manipulating the morphology of ternary films, achieving a suitable phase-separated size scale (crystalline domains approach tens of nanometer scale) and creating an intertwined donor–acceptor bicontinuous network, resulting in efficient exciton dissociation and charge carrier transport within the ternary photoactive layer. The second acceptors (guest acceptors) are almost as third component materials due to the good compatibility of the host donor and the host acceptor . In contrast, it is more difficult to regulate the compatibility of the second donor and the host donor and coordinate the surface and bulk morphology of the ternary photoactive layer.…”

Section: Introductionmentioning

confidence: 99%

Nonfullerene Ternary Organic Photovoltaics with Long-Wavelength Light-Absorption Guest Donor Materials to Improve Photovoltaic Performance

Yang,

Liu,

Chen

2023

ACS Appl. Polym. Mater.

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In order to achieve efficient organic photovoltaics (OPVs), a ternary strategy was adopted with the efficient long-wavelength light-absorption donor material of PSBTBT as the third component material (guest donor) and the D18-Cl:BTP-eC9 binary film as the host photoactive layer, which facilitates the acquisition of absorption spectra complementary to those of D18-Cl and BTP-eC9. The PL spectrum of D18-Cl was covered by the absorption spectrum of PSBTBT, which further supports the energy transfer from D18-Cl to PSBTBT. In addition, the addition of a small amount of PSBTBT to the D18-Cl:BTP-eC9 binary film slightly changed the bulk and surface morphology of the photoactive layer, while appropriate phase separation size and a smooth surface could be achieved for both the D18-Cl:BTP-eC9 binary film and the optimized ternary film. Thus, with 10% PSBTBT as the third component material (D18-Cl/PSBTBT/BTP-eC9 ratio of 0.9:0.1:1.2), the ternary OPV shows a higher power conversion efficiency (PCE) of 17.35%. The improvement of photovoltaic performance is due to the short-circuit current density (J SC ) enhancement from 24.65 to 26.23 mA cm −2 , even though the open-circuit voltage (V OC ) weakly decreased from 0.905 to 0.900 V. This work provides an effective method to find a guest polymer that matches the host binary photoactive layer, broadens the absorption spectrum, and provides efficient energy transfer within both donor materials.

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Enhancing the Marangoni flow by inner side chain engineering in nonfullerene acceptors for reproducible blade coating-processed organic solar cell manufacturing

Abstract: The industrial-scale, uniform film production of active layers is a prerequisite for high-performance, reproducible organic solar cells (OSCs), becoming a significant challenge. Blade coating, one of the most suitable protocols...

Cited by 12 publications

References 71 publications

Molecular Stacking and Aggregation Optimization of Photoactive Layer through Solid Additive Enables High‐Performance Organic Solar Cells

Molecular Stacking and Aggregation Optimization of Photoactive Layer through Solid Additive Enables High‐Performance Organic Solar Cells

A–A Strategy Enables Desirable Performance of All-Polymer Solar Cells Fabricated with Nonhalogenated Solvents

Nonfullerene Ternary Organic Photovoltaics with Long-Wavelength Light-Absorption Guest Donor Materials to Improve Photovoltaic Performance

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