Dithienobenzoxadiazole-based wide bandgap donor polymers with strong aggregation properties for the preparation of efficient as-cast non-fullerene polymer solar cells processed using a non-halogenated solvent

Jiang, Haiying; Qin, Guoming; Zhang, Lianjie; Pan, Feilong; Wu, Zhuhao; Wang, Qian; Wen, Guanzhao; Zhang, Wei; Cao, Yong; Chen, Junwu

doi:10.1039/d0tc04909c

Cited by 12 publications

(12 citation statements)

References 61 publications

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“…A further red−shift occurred in the ssNP system without the addition of DIO during the NP synthesis process (λ max of 636 and 836 nm for PM6 and BTP−eC9, respectively), which indicated a conversion in the molecular packing behavior. Compared to DIO−free ssNPs, a lesser red−shift suggests less aggregates and phase−separation in the ssNP film with DIO [ 35 ]. The PL spectra of DIO−free ssNP films represents an incomplete PL quenching at both PM6 and BTP−eC9 peaks, thus further confirming an insufficient percolation of donor and acceptor without an additive ( Figure 4 ).…”

Section: Resultsmentioning

confidence: 99%

Water−Processed Organic Solar Cell with Efficiency Exceeding 11%

et al. 2022

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Water processing is an ideal strategy for the ecofriendly fabrication of organic photovoltaics (OPVs) and exhibits a strong market−driven demand. Here, we report a state−of−the−art active material, namely PM6:BTP−eC9, for the synthesis of water−borne nanoparticle (NP) dispersion towards ecofriendly OPV fabrication. The surfactant−stripping technique, combined with a poloxamer, facilitates purification and eliminates excess surfactant in water−dispersed organic semiconducting NPs. The introduction of 1,8−diiodooctane (DIO) for the synthesis of surfactant−stripped NP (ssNP) further promotes a percolated microstructure of the polymer and NFA in each ssNP, yielding water−processed OPVs with a record efficiency of over 11%. The use of an additive during water−borne ssNP synthesis is a promising strategy for morphology optimization in NP OPVs. It is believed that the findings in this work will engender more research interest and effort relating to water−processing in preparation of the industrial production of OPVs.

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Section: Resultsmentioning

confidence: 99%

Water−Processed Organic Solar Cell with Efficiency Exceeding 11%

et al. 2022

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“…The increase is more substantial in blends with DIO, i.e., 81% for DIO(xTA), followed by 77% for DIO(TA), compared to 27% for xDIO(xTA). Suggestively, the retained solvent (when no thermal annealing is performed) and DIO provide “pathways” that enhance IT‐4Cl diffusion, which is believed to be driven by the difference in PM6 (38.12 mJ m −2 ) [ 11 ] and IT‐4Cl (42.40 mJ m −2 ) [ 12 ] surface energies to adopt the most stable molecular arrangement.…”

Section: Resultsmentioning

confidence: 99%

Effects of Vertical Molecular Stratifications and Microstructures on the Properties of Fullerene‐Free Organic Solar Cells

Peña

Sharma

et al. 2022

Advanced Photonics Research

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From the past years, the most commonly reported state‐of‐the‐art binary bulk heterojunction organic solar cells (OSCs) are mostly based on mixtures of polymer donors and fullerene‐free acceptors (polymer:NFA). However, along with it are a number of contradictory propositions, including (but not limited to) strategies to reduce energy loss and improve photocurrent generation through energy level alignments. Due to the resulting high similarity of molecular fragments from polymer:NFA heterojunctions, the effects of vertical molecular stratification are not yet well studied. Herein, the time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) molecular depth profiling reveals a vertical stratification in PM6:IT‐4Cl and illustrates how it can significantly influence the photovoltaic properties. The said inhomogeneity is also bound to introduce microstructure variations within device active layers. Consequently, it is systematically demonstrated how thin‐film microstructures can influence optoelectronic properties, wherein important metrics (e.g., energy losses and molecular energy offsets) are highly dependent. Thus, the understanding from this work provides foundations for more precise development of strategies to further advance OSC technology in future studies.

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“…45,56 According to our previous works, ffQx−Thbased polymers and IT-4Cl were suitable for the nonhalogenated solvent-processed devices. 56,57 In addition, O-XY (oral/rat LD 50 = 3567 mg kg −1 ) shows weaker toxicity than the heavily used solvents like CF (oral/rat LD 50 = 695 mg kg −1 ) and CB (oral/rat LD 50 = 1110 mg kg −1 ), even weaker than nonhalogenated and nonaromatic tetrahydrofuran (oral/rat LD 50 = 1650 mg kg −1 ). 58 Consequently, O-XY was selected as the processing solvent.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…To estimate the influence of the branching point position on photovoltaic performance, the inverted PSCs with a configuration of ITO/ZnO/polymer:IT-4Cl (1:1 in weight)/MoO 3 /Al were fabricated. Here, IT-4Cl was chosen because of low synthetic complexity, complementary absorption, and matched energy levels. , According to our previous works, ffQx–Th-based polymers and IT-4Cl were suitable for the nonhalogenated solvent-processed devices. , In addition, O-XY (oral/rat LD 50 = 3567 mg kg –1 ) shows weaker toxicity than the heavily used solvents like CF (oral/rat LD 50 = 695 mg kg –1 ) and CB (oral/rat LD 50 = 1110 mg kg –1 ), even weaker than nonhalogenated and nonaromatic tetrahydrofuran (oral/rat LD 50 = 1650 mg kg –1 ) . Consequently, O-XY was selected as the processing solvent.…”

Section: Resultsmentioning

confidence: 99%

Delicately Controlled Polymer Orientation for High-Performance Non-Fullerene Solar Cells with Halogen-Free Solvent Processing

Yuan

Qin

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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Molecular orientation in polymer solar cells (PSCs) is a critical subject of investigation that promotes the quality of bulk heterojunction morphology and power conversion efficiency (PCE). Herein, the intrinsic polymer orientation transition can be found upon delicate control over the branching point position of the irregular alkoxy side chain in difluoroquinoxaline−thiophene-based conjugated polymers. Three polymers with branching points at the third, fourth, and fifth positions away from the backbone were synthesized and abbreviated as PHT3, PHT4, and PHT5, respectively. Temperature-dependent absorption behavior manifests the polymer aggregation ability in the order of PHT3 < PHT4 < PHT5. Surprisingly, the polymer orientation transition from typical face-on to edgeon emerged between PHT4 and PHT5, as evidenced by X-ray-scattering analysis. The enhanced face-on crystallinity of PHT4 endowed the o-xyleneprocessed PHT4:IT-4Cl-based devices with the highest PCE of 13.40%. For PHT5 with stronger aggregation, the related o-xylene-processed PSCs still showed a good PCE of 12.66%. Our results demonstrate that a delicate polymer orientation transition could be realized through a precisely controlled strategy of the side chain, yielding green-solvent-processed high-performance PSCs.

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Dithienobenzoxadiazole-based wide bandgap donor polymers with strong aggregation properties for the preparation of efficient as-cast non-fullerene polymer solar cells processed using a non-halogenated solvent

Abstract: The efficient as-cast polymer solar cells being processed by the non-halogenated solvent are capable for the roll-to-roll printing technique. Herein, three dithienobenzoxadiazole-based wide bandgap polymers PBOffDT, PBOTT and PBOTVT, which...

Cited by 12 publications

References 61 publications

Water−Processed Organic Solar Cell with Efficiency Exceeding 11%

Water−Processed Organic Solar Cell with Efficiency Exceeding 11%

Effects of Vertical Molecular Stratifications and Microstructures on the Properties of Fullerene‐Free Organic Solar Cells

Delicately Controlled Polymer Orientation for High-Performance Non-Fullerene Solar Cells with Halogen-Free Solvent Processing

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