Dual Polymerized Y‐Acceptors of Distinct‐Dimensionality Create Neuron‐Like Interpenetrating Hierarchical Network towards Efficient and Stable All‐Polymer Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(16)

Опубликована: Янв. 12, 2024

Abstract All‐polymer solar cells have garnered particular attention thanks to their superior thermal, photo, and mechanical stabilities for large‐scale manufacturing, yet the performance enhancement remains largely restrained by inherent morphological challenges of bulk‐heterojunction active layer. Herein, a 3D Y‐branched polymerized small‐molecule acceptor named PYBF , characteristic high molecular weight glass transition temperature, is designed synthesized precisely linking C 3h ‐symmetric benzotrifuran with Y6 acceptors. In comparison benchmark thiophene‐bridged linear PYIT acceptor, an optical blue‐shift absorption observed slightly higher power conversion efficiency (PCE) 15.7% (vs 15.14%) obtained when paired polymer donor PM6, which benefit from more crystalline face‐on‐oriented domains. However, star‐like bulky structure results in nucleation‐growth dominant phase‐separation polymeric blends, generates stumpy droplet‐like fibrils impairs continuity phases. This issue however surprisingly resolved incorporating small amount PYIT, leads formation interconnective neuron‐like dual‐acceptor domains long‐chain entanglements acceptors alleviates bimolecular recombination. Thus, champion device realizes respectable PCE up ≈17% importantly exhibits thermal storage counterpart.

Язык: Английский

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In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells

National Science Review, Год журнала: 2024, Номер 11(12)

Опубликована: Ноя. 4, 2024

ABSTRACT Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells (all-PSCs), a promising photovoltaic technology towards multi-scenario application. Although the nano-fibrillar network of active layer induced by treatment is confirmed as key factor power conversion efficiency (PCE) all-PSCs, its formation mechanism not clearly revealed, lack precise and convincing real-time observation crystallization phase separation during liquid-to-solid transition process spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering (GIWAXS/GISAXS) screening that reveals fact naphthalene derived solid additives can suppress aggregation polymer acceptor (PY-IT) at beginning stage spin coating, which provides sufficient time space donor (PM6) to form fibril structure. Moreover, guided this knowledge, ternary system proposed, achieves cutting-edge level PCEs both small-area (0.04 cm2) (also decent operational stability) large-area (1 devices.

Язык: Английский

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High‐Performance Photoactive Polymers: Innovations in Ternary Polymerization for Solar Applications

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 2, 2025

Abstract In recent years, polymer solar cells (PSCs) have achieved rapid progress, with power conversion efficiencies (PCEs) reaching up to 20.25%, driven by significant advancements in device fabrication and active‐layer materials. The ternary polymerization strategy has proven be a straightforward effective approach for developing high‐performance photoelectric polymers incorporating third monomer into the backbone. This incorporation effectively optimizes intrinsic properties, including UV–vis absorption, energy levels, solubility, crystallinity, morphology, charge transfer, mechanical robustness, batch‐to‐batch reproducibility, stability. review highlights latest designing photoactive copolymers (both donors acceptors), particular focus on stability, potential applications commercial development. aim is provide valuable guidance development of materials using strategy.

Язык: Английский

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Layered All‐Polymer Solar Cells with Efficiency of 18.34% by Employing Alloyed Polymer Donors

Small, Год журнала: 2025, Номер 21(11)

Опубликована: Фев. 7, 2025

Abstract A series of layered all‐polymer solar cells (LA‐PSCs) with the normal or inverted structure are prepared by employing a sequential spin‐coating method PBQx‐TCl, PM1 as polymer donor, and PY‐DT acceptor. The power conversion efficiency (PCE) LA‐PSCs can be improved from 17.20% to 18.34% incorporating 30 wt.% into PBQx‐TCl layer, resulting simultaneously increased J SC 25.35 mA cm −2 , V OC 0.971 FF 74.49%. PCE improvement also achieved PBQx‐TCl:PM1 donor layers. mixed prefer form alloyed states in LA‐PSCs, which confirmed gradually s more content Meanwhile, photogenerated excitons layers dissociated at interface between PM1, especially for located near ITO electrode. exciton dissociation provide an additional channel improving utilization efficiency, positive external quantum spectral difference (∆EQE) values Over 6.6% realized using layer.

Язык: Английский

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Breaking 20% Efficiency of all‐Polymer Solar Cells via Benzo[1,2‐d:4,5‐d′]Bisthiazole‐Based Terpolymer Donor Strategy for Fine Morphology Optimization

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 15, 2025

Abstract Developing high‐performance all‐polymer solar cells (all‐PSCs) remains a challenge due to the difficulty in controlling morphology of polymer blends. In this study, benzo[1,2‐d:4,5‐d′]bisthiazole (BBTz) is incorporated into PM6 main chain create series terpolymer donors, leveraging entropy increase and superior miscibility with acceptors modulate blend morphology. The introduction BBTz broadened absorption range, enhanced film crystallinity, significantly improved donor‐acceptor through its low dipole moment high electrostatic potential. This facilitated formation nanofiber structures active layer, thus optimizing As result, PBZ‐10:PY‐IT‐based device achieved an impressive power conversion efficiency (PCE) 19.06%. Incorporation PBQx‐TF binary can further improve morphology, charge transport, exciton lifetime, dissociation, collection, as well suppressed recombination, finally leading record‐breaking PCE 20.04% for all‐PSCs date. findings demonstrate effectiveness strategy enhancing all‐PSC performance. By molecular design component selection, approach provides viable pathway achieving higher supports advancement renewable energy technologies.

Язык: Английский

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