Regulating the phase separation of ternary organic solar cells via 3D architectured AIE molecules

Adil, Muhammad Abdullah; Zhang, Jianqi; Wang, Yuheng; Yu, Jinde; Yang, Chen; Lu, Guanghao; Wei, Zhixiang

doi:10.1016/j.nanoen.2019.104271

Cited by 53 publications

(45 citation statements)

References 46 publications

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“…With the development of organic optoelectronic materials, device structures, and fabrication processes, device performance has been fundamentally optimized, and power conversion efficiency (PCE) of single-junction OPV has exceeded 18% until now (Lin et al, 2015(Lin et al, , 2019Zhao et al, 2015Zhao et al, , 2017Liu et al, 2016Liu et al, , 2020Meng et al, 2018;Cheng et al, 2019;Yuan et al, 2019). As compared with organic films deposited upon vacuum evaporation, during the BHJ films deposition from solution, the phase evolution of binary or ternary blends usually induces vertical phase separation, leading to film-depth-dependent distribution of both composition and morphology (Xu et al, 2009;Yan et al, 2017;Bi et al, 2018;Huang et al, 2018;Adil et al, 2019;Yan H. et al, 2019). To study the vertical distribution characteristics of film, many methods have been developed.…”

Section: Introductionmentioning

confidence: 99%

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

et al. 2020

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Organic donor-acceptor bulk heterojunction are attracting wide interests for solar cell applications due to solution processability, mechanical flexibility, and low cost. The photovoltaic performance of such thin film is strongly dependent on vertical phase separation of each component. Although film-depth-dependent light absorption spectra measured by non-in situ methods have been used to investigate the film-depth profiling of organic semiconducting thin films, the in situ measurement is still not well-resolved. In this work, we propose an in situ measurement method in combination with a self-developed in situ instrument, which integrates a capacitive coupled plasma generator, a light source, and a spectrometer. This in situ method and instrument are easily accessible and easily equipped in laboratories of the organic electronics, which could be used to conveniently investigate the film-depth-dependent optical and electronic properties.

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Section: Introductionmentioning

confidence: 99%

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

et al. 2020

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“…[ 41 ] Moreover, the accurate distribution of the third component is further estimated by the Flory–Huggins interaction parameter χ (Table S1, Supporting Information). [ 42 ] The smaller χ values of 0.091 and 0.016 for PDI‐2T:BTP‐4Cl and DRCN5T:PM6 with respect to those of PDI‐2T:PM6 (0.511) and DRCN5T:BTP‐4Cl (0.292) validate the better compatibility between two electron acceptors as well as two electron donors, [ 26,43 ] which is very conducive to constructing the alloy states in the acceptor and donor phase. [ 40,44 ] Figure 1b exhibited the normalized absorption spectra of these materials.…”

Section: Resultsmentioning

confidence: 99%

Suppressing Kinetic Aggregation of Non‐Fullerene Acceptor via Versatile Alloy States Enables High‐Efficiency and Stable Ternary Polymer Solar Cells

Zhang

Guo

Zhang

et al. 2021

Adv Funct Materials

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Despite considerable advances devoted to improving the operational stability of organic solar cells (OSCs), the metastable morphology degradation remains a challenging obstacle for their practical application. Herein, the stabilizing function of the alloy states in the photoactive layer from the perspective of controlling the aggregation characteristics of non‐fullerene acceptors (NFAs), is revealed. The alloy‐like model is adopted separately into host donor and acceptor materials of the state‐of‐the‐art binary PM6:BTP‐4Cl blend with the self‐stable polymer acceptor PDI‐2T and small molecule donor DRCN5T as the third components, delivering the simultaneously enhanced photovoltaic efficiency and storage stability. In such ternary systems, two separate arguments can rationalize their operating principles: (1) the acceptor alloys strengthen the conformational rigidity of BTP‐4Cl molecules to restrain the intramolecular vibrations for rapid relaxation of high‐energy excited states to stabilize BTP‐4Cl acceptor. (2) The donor alloys optimize the fibril network microstructure of PM6 polymer to restrict the kinetic diffusion and aggregation of BTP‐4Cl molecules. According to the superior morphological stability, non‐radiative defect trapping coefficients can be drastically reduced without forming the long‐lived, trapped charge species in ternary blends. The results highlight the novel protective mechanisms of engineering the alloy‐like composites for reinforcing the long‐term stability of NFA‐based ternary OSCs.

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“…Subsequently, the miscibility and interaction of the two components in the donor:SMA blend are assessed by calculating Flory-Huggins interaction parameter χ donor-acceptor , according to the empirical equation χ donor-acceptor = k[(γ donor ) 1/2 À (γ acceptor ) 1/2 ] 2 , where k is a positive constant, and γ donor and γ acceptor are the surface energy of the corresponding polymer donor and SMA films, respectively. [61] For the donor: acceptor pair of PBDB-T and DTCFDV-IC, a smaller χ donor-acceptor value (0.12 k) is obtained compared to the PBDB-T:DTCFSV-IC pair (0.18 k), suggesting that DTCFDV-IC has much better miscibility with PBDB-T relative to DTCFSV-IC. When PBDB-TF was used to pair with DTCFDV-IC, a slightly increased χ donoracceptor value of 0.13 k is found, which indicates better miscibility between PBDB-T and DTCFDV-IC than that of between PBDB-TF and DTCFDV-IC.…”

Section: Morphology and Miscibility Analysismentioning

confidence: 88%

Effect of Arylmethylene Substitutions on Molecular Structure, Optoelectronic Properties and Photovoltaic Performance of Dithienocyclopentafluorene‐Based Small‐Molecule Acceptors

Tang

Liao

Zheng

et al. 2021

Chemistry A European J

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Two dithienocyclopentafluorene-based small-molecule acceptors (SMAs) were developed that feature methylene-functionalized conjugated side chains, to study the effect of arylmethylene substitution and its number on structure, optoelectronic properties and device performance. Results showed that two SMAs have better absorption properties and planarity, lower bandgaps and higher LUMOs compared with the control SMA without conjugated side chains. The synthesized SMAs were tested in polymer solar cells for examples of their applicability. This work argues that the introduction of methylene-functionalized conjugated side chains has great potential in tuning molecular structure, optoelectronic properties, device physics and photovoltaic performance of SMAs.

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Regulating the phase separation of ternary organic solar cells via 3D architectured AIE molecules

Cited by 53 publications

References 46 publications

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

Suppressing Kinetic Aggregation of Non‐Fullerene Acceptor via Versatile Alloy States Enables High‐Efficiency and Stable Ternary Polymer Solar Cells

Effect of Arylmethylene Substitutions on Molecular Structure, Optoelectronic Properties and Photovoltaic Performance of Dithienocyclopentafluorene‐Based Small‐Molecule Acceptors

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