Rational strategy to enhance the thermal stability of solar cell performance using a photocrosslinkable conjugated polymer

Chau, Hong Diem; Park, Sungnam; Jung, Sung Hoon; Park, Jin Young; Kang, Min Ji; Harit, Amit Kumar; Woo, Han Young; Cho, Min Ju; Choi, Donghoon

doi:10.1039/d3ta00872j

Cited by 4 publications

(5 citation statements)

References 71 publications

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“…The optimal sample exhibited a PCE of 11.20%, which was achieved with 2.5 wt % BABP and 8 min of UV treatment. The UV treatment time was reduced to mitigate prolonged UV irradiation, which can induce cross-linking reactions, accompanied by the degradation and photobleaching of the PM6 material . A comparative analysis (Table S1) revealed that with 2 wt % BABP, PCE values of 10.24 and 8.71% were recorded for 8 and 15 min of UV treatment, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In our experiments, photo-cross-linking was performed by exposing the PM6 films with BABP to UV light for less than 15 min. This is because prolonged irradiation under such harsh conditions can induce cross-linking reactions, accompanied by degradation and photobleaching of the organic materials …”

Section: Resultsmentioning

confidence: 99%

“…This is because prolonged irradiation under such harsh conditions can induce cross-linking reactions, accompanied by degradation and photobleaching of the organic materials. 28 Furthermore, PL quenching of the electron donor component provides direct evidence of exciton dissociation and subsequent photoinduced electron transfer. Efficient PL quenching is a necessity for the efficient OSCs.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

“…However, this approach requires synthesizing a polymer having reactive side chains compatible with the selected cross-linker. 27,28 In recent development, cross-linkers featuring oxetane, bromo, vinyl, acrylate, and azide side chains have been used to fabricate OSCs. 27,29−31 The cross-linking of conjugated polymers relies on a bimolecular reaction between their functional groups, which is activated by thermal or ultraviolet (UV) light treatment.…”

Section: Introductionmentioning

confidence: 99%

“…As part of the widely utilized BSD process, numerous researchers have employed cross-linkers to cross-link the reactive side chains of the polymers, thereby stabilizing the morphology of the BHJ film and enhancing device performance. However, this approach requires synthesizing a polymer having reactive side chains compatible with the selected cross-linker. , …”

Section: Introductionmentioning

confidence: 99%

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Enhancing Reproducibility in Organic Solar Cell Fabrication via Static Sequential Deposition with Cross-Linked Polymer Donor and Nonfullerene Acceptor

Kim,

Kong,

Kim

et al. 2024

ACS Appl. Polym. Mater.

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The key to developing highly efficient organic solar cells (OSCs) hinges on crafting a photoactive layer with a bulk heterojunction (BHJ) structure. In this study, we fabricated a BHJ via sequential deposition (SqD), employing a PM6 polymer and Y6 small molecules as the donor and acceptor materials, respectively. Renowned for their pivotal roles in boosting the device performance, PM6 and Y6 have garnered significant attention among researchers. To address challenges associated with SqD techniques, such as achieving uniform coverage and establishing interfacial compatibility between layers, our approach (referred to as XSqD) involves depositing a cross-linked PM6 donor layer, followed by a Y6 acceptor layer, utilizing a static coating method and a good solvent. An azide-functionalized small molecule is employed to cross-link the PM6 polymer. Notably, the exposure of the PM6 polymer to the cross-linker under ultraviolet light and thermal annealing induces preferential cross-linking, resulting in the formation of a stable polymer network that effectively locks the internal morphology of the active layer without compromising its optical or electrical properties. OSCs fabricated via XSqD demonstrated enhanced power conversion efficiency and reproducibility compared with OSCs prepared using SqD with un-cross-linked PM6.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Photophysical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhancing Reproducibility in Organic Solar Cell Fabrication via Static Sequential Deposition with Cross-Linked Polymer Donor and Nonfullerene Acceptor

Kim,

Kong,

Kim

et al. 2024

ACS Appl. Polym. Mater.

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High Polymer Molecular Weight Yields Solar Cells with Simultaneously Improved Performance and Thermal Stability

Riera‐Galindo,

Sanz‐Lleó,

Gutiérrez‐Fernández

et al. 2024

Small

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Simple synthetic routes, high active layer thickness tolerance as well as stable organic solar cells are relentlessly pursued as key enabling traits for the upscaling of organic photovoltaics. Here, the potential to address these issues by tuning donor polymer molecular weight is investigated. Specifically, the focus is on PTQ10, a polymer with low synthetic complexity, with number average molecular weights of 2.4, 6.2, 16.8, 52.9, and 54.4 kDa, in combination with three different non‐fullerene acceptors, namely Y6, Y12, and IDIC. Molecular weight, indeed, unlocks a threefold increase in power conversion efficiency for these blends. Importantly, efficiencies above 10% for blade coated devices with thicknesses between 200 and 350 nm for blends incorporating high molecular weight donor are shown. Spectroscopic, GIWAXS and charge carrier mobility data suggest that the strong photocurrent improvement with molecular weight is related to both, improved electronic transport and polymer contribution to exciton generation. Moreover, it is demonstrated that solar cells based on high molecular weight PTQ10 are more thermally stable due to a higher glass transition temperature, thus also improving device stability.

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Cross-Linking-Integrated Sequential Deposition: A Method for Efficient and Reproducible Bulk Heterojunctions in Organic Solar Cells

Kim,

Heo,

et al. 2024

ACS Appl. Mater. Interfaces

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The formation of bulk heterojunctions (BHJs) through sequential deposition (SqD) of polymer donor and nonfullerene acceptor (NFA) solutions offers advantages over the widely used single-step deposition of polymer:NFA blend solutions (BSD). To enhance the application of SqD in organic solar cell production, it is crucial to improve reproducibility and stability while maintaining a high efficiency. This study introduces a novel method termed cross-linking-integrated sequential deposition (XSqD) for fabricating efficient and reproducible BHJs. In this method, polymers are cross-linked using efficient 2Bx-4EO or 2Bx-8EO cross-linkers, which enhance the solvent resistance of the polymer donor layer against the solvents used for NFAs. This approach addresses the challenge of selecting a suitable solvent for NFAs, a major obstacle in SqD-processed OSCs. The utilization of 2Bx-4EO in XSqD leads to a significant increase in reproducibility compared to that of conventional SqD, coupled with a high-power conversion efficiency (PCE) of 14.1%. Furthermore, XSqD devices exhibit superior stability, showing only 1% and 6% reductions in their initial PCE after thermal stress at 80 and 120 °C for 50 h, respectively.

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Rational strategy to enhance the thermal stability of solar cell performance using a photocrosslinkable conjugated polymer

Abstract: In addition to the power conversion efficiency (PCE) of polymer solar cells (PSCs), long-term stability is a critical requirement. In this study, a crosslinkable PM6-based polymer donor, PM6-X30, was developed...

Cited by 4 publications

References 71 publications

Enhancing Reproducibility in Organic Solar Cell Fabrication via Static Sequential Deposition with Cross-Linked Polymer Donor and Nonfullerene Acceptor

Enhancing Reproducibility in Organic Solar Cell Fabrication via Static Sequential Deposition with Cross-Linked Polymer Donor and Nonfullerene Acceptor

High Polymer Molecular Weight Yields Solar Cells with Simultaneously Improved Performance and Thermal Stability

Cross-Linking-Integrated Sequential Deposition: A Method for Efficient and Reproducible Bulk Heterojunctions in Organic Solar Cells

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