16.5% efficiency ternary organic photovoltaics with two polymer donors by optimizing molecular arrangement and phase separation

Xie, Guanshui; Zhang, Zheling; Su, Zhenying; Zhang, Xiaoling; Zhang, Jian

doi:10.1016/j.nanoen.2020.104447

Cited by 81 publications

(67 citation statements)

References 41 publications

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“…The spectral overlap between PL spectrum of PAEF and absorption spectrum of PM6 can well support the Dexter or Förster resonance energy transfer between PAEF and PM6, which is responsible for the increased J SC ’s. [ 52,53 ] 2) High dielectric insulating polymers, such as PAE resins [ 54–56 ] and polystyrene derivatives, [ 57 ] can induce the enhanced dielectric property and built‐in‐potential of the BHJ layer, which has been proved to result in improved device performance, such as high J SC ’s and PCEs in solar cells. [ 57–62 ] As shown in Figure S27 in the Supporting Information, the integrated J SC ’s from the external quantum efficiency (EQE) curves and enhanced EQE responses are consistent with the J – V measurements.…”

Section: Resultsmentioning

confidence: 99%

A Universal Method to Enhance Flexibility and Stability of Organic Solar Cells by Constructing Insulating Matrices in Active Layers

Han

Bao

Huang

et al. 2020

Adv Funct Materials

113

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With the rapid development of power conversion efficiency (PCE), flexibility–stability of organic solar cells (OSCs) are becoming one of the primary barriers for commercialization. This work shows that insulating poly(aryl ether) (PAE) resins have highly twisted‐stiff backbones without any side chains, which possess excellent mechanical stability, thermal stability, and good compatibility with organic photovoltaic materials. After introducing 5 wt% PAE resin as supporting matrices into the bulk heterojunction (BHJ) layer, the device yields a high PCE of 16.13%. Importantly, the devices show impressive flexibility and improved stability with passivated morphology, such as PM6/Y6‐based devices with 30 wt% PAE retains the PCE of 15.17% and exhibits enhanced 4.4‐fold elongation at break (25.07%). This is the recorded stretchability of the BHJ layer for OSCs with PCE > 8%, and morphological changes during tensile deformation are first investigated by in situ wide‐angle X‐ray scattering measurements. The PAE matrices strategy exhibits good universality in the other four photovoltaic systems. These results demonstrate that heat‐resistant PAE resins serve as supporting matrices with a tunneling effect into OSCs without sacrificing photovoltaic performance and simultaneously improve the flexibility and stability of devices, which can play an important role in promoting the development of stable and wearable electronics.

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Section: Resultsmentioning

confidence: 99%

A Universal Method to Enhance Flexibility and Stability of Organic Solar Cells by Constructing Insulating Matrices in Active Layers

Han

Bao

Huang

et al. 2020

Adv Funct Materials

113

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“…[8][9][10][11][12] Implemented in bulk heterojunction solar cells, device efficiencies of 16% were already reached with various donor/acceptor material combinations using the SMAs BTP-4X 13 and Y6. [14][15][16] Recently, PCE values of 17.35% have been reported. 17 Among the broad variety of different structures, NFAs based on perylenes have been in the focus since the beginning of organic solar cell research and were used in the first organic heterojunction solar cell by C. W. Tang back in 1986.…”

Section: Introductionmentioning

confidence: 99%

Comparison of fluorene, silafluorene and carbazole as linkers in perylene monoimide based non-fullerene acceptors

et al. 2020

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“…On the contrary, morphological traps could be reduced when the two polymers were compatible and an overall increased efficiency could be seen. Ternary strategies based on two polymers and one small-molecule nonfullerene acceptor (NFA) with overall increased PCEs [42][43][44][45][46] are still largely challenged by the success both on selections of guest polymers and on choses of fullerene-free host material systems, as it limits the success enabling to maintain the binary blend film-morphologies and further to improve structural order, done as that seen on smallmolecule guest components based ternary strategies.…”

Section: Introductionmentioning

confidence: 99%

Phthalimide Polymer Donor Guests Enable over 17% Efficient Organic Solar Cells via Parallel‐Like Ternary and Quaternary Strategies

Zhang

Huang

et al. 2020

Advanced Energy Materials

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Ternary strategies show over 16% efficiencies with increased current/voltage owing to complementary absorption/aligned energy level contributions. However, poor understanding of how the guest components tune the active layer structures still makes rational selection of material systems challenging. In this study, two phthalimide based ultrawide bandgap polymer donor guests are synthesized. Parallel energies between the highest occupied molecular orbitals of host and guest polymers are achieved via incorporating selnophene on the guest polymer. Solid‐state 19F magic angle spinning nuclear magnetic spectroscopy, graze‐incidence wide‐angle X‐ray diffraction, elemental transmission electron microscopy mapping, and transient absorption spectroscopy are combined to characterize the active layer structures. Formation of the individual guest phases selectively improves the structural order of donor and acceptor phase. The increased electron mobility in combination with the presence of the additional paths made by the guest not only minimizes the influence on charge generation and transport of the host system but also contributes to increasing the overall current generation. Therefore, phthalimide based polymers can be potential candidates that enable the simultaneous increase of open‐circuit voltage and short‐circuit current‐density via fine‐tuning energy levels and the formation of additional paths for enhancing current generation in parallel‐like multicomponent organic solar cells.

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16.5% efficiency ternary organic photovoltaics with two polymer donors by optimizing molecular arrangement and phase separation

Cited by 81 publications

References 41 publications

A Universal Method to Enhance Flexibility and Stability of Organic Solar Cells by Constructing Insulating Matrices in Active Layers

A Universal Method to Enhance Flexibility and Stability of Organic Solar Cells by Constructing Insulating Matrices in Active Layers

Comparison of fluorene, silafluorene and carbazole as linkers in perylene monoimide based non-fullerene acceptors

Phthalimide Polymer Donor Guests Enable over 17% Efficient Organic Solar Cells via Parallel‐Like Ternary and Quaternary Strategies

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