Synergistic control of multilength-scale morphology and vertical phase separation for high-efficiency organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(20), С. 7762 - 7771

Опубликована: Янв. 1, 2024

Controlling the morphology of organic solar cells (OSCs) presents a significant challenge due to their complex structure and composition.

Язык: Английский

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Achieving 19.72% Efficiency in Ternary Organic Solar Cells through Electrostatic Potential‐Driven Morphology Control

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 9, 2024

Abstract The ternary strategy has proven effective in enhancing the performance of organic solar cells (OSCs), yet identifying optimal third component remains a challenge due to lack theoretical frameworks for predicting its impact based on molecular structure. This study addresses this by proposing quantitative parameters derived from surface electrostatic potential (ESP) as criteria selecting components. asymmetric acceptor BTP‐OS, which exhibits lower total average ESP and larger polarization index relative host acceptor, is introduced into PM6:L8‐BO system. incorporation led weakened ESP‐induced intermolecular interactions reduce miscibility with donor polymer, resulting an optimized multi‐scale morphology blend. Consequently, device achieved efficiency 19.72%, one highest values PM6:L8‐BO‐based devices, enhanced exciton dissociation charge collection, energy disorder, minimized non‐radiative losses. Comparable improvements are also verified PM6:BTP‐eC9 D18:N3 systems, demonstrating broad applicability proposed approach. not only provides practical principle components but establishes broader framework optimizing OSCs, potentially advancing development more efficient OSCs across diverse material systems.

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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Tailoring small-molecule acceptors through asymmetric side-chain substitution for efficient organic solar cells

Science China Materials, Год журнала: 2025, Номер 68(3), С. 860 - 867

Опубликована: Фев. 13, 2025

Язык: Английский

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Improving the Performance of Ternary Organic Solar Cells via Optimizing Molecular Orientation and 3D Charge Transport

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 20, 2025

Abstract Recently, through in‐depth investigations of ternary organic solar cells (OSCs), scientists have discovered that small molecules (SMs) with edge‐on orientation serving as the third component can boost transverse charge transport and consequently enhance device performance. Nevertheless, little research has been conducted on determining how to select an appropriate improve 3D transport. Herein, four SMs are designed by gradually increasing quantity alkyl thiophene π‐bridge adjust their crystallinity orientation. The resulting show similar but different crystalline degrees, due complex effects molecular steric hindrance extended conjugation. After introduction SMs, most devices exhibited a pronounced improvement in power conversion efficiencies (PCEs) than control binary counterparts. An elegant PCE 19.02% fill factor approaching 80% collected OSCs. A balanced bimodal mechanism is proposed effectively elucidated blend film, enabling charges bypass interfering domains thereby This provides guidance for development SM components form percolation paths facilitate subsequently performance devices.

Язык: Английский

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α‐ZnO Manipulated Growth of Ag Gird on AgNWs Enables High Conductive Flexible Electrode for Large‐Area Monolithic Organic Photovoltaics

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

Abstract The conductivity of AgNWs electrodes can be enhanced by incorporating Ag grids, thereby facilitating the development large‐area flexible organic solar cells (FOSCs). grids from vacuum evaporation offer advantages simple film formation, adjustable thickness, and unique structure. However, complex 3D multi‐component structure will exacerbate aggregation large particles, causing device short circuits. To address this issue, relationship between surface energy modification layers morphology ultrathin on is studied. amorphous ZnO (α‐ZnO) layer promotes growth Volmer–Weber (VW) to Frank–Van der Merwe (FM), reducing particle aggregation. 1 µm thick PET/AgNWs/Ag grid electrode with α‐ZnO exhibited low contact resistance high conductivity. As a result, cm 2 FOSCs achieve power conversion efficiency (PCE) 16.01%. area increased 4 9 , performance monolithic 14.70% 12.69%, showing less loss during upscaling. 8 16 modules constructed series parallel connection devices yield PCEs 14.47% 12.92%, respectively. This study offers valuable insights into constructing for highly efficient FOSCs.

Язык: Английский

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All‐Polymer Bulk‐Heterojunction Enables Stable Monolithic Perovskite/Organic Tandem Solar Cells with High Efficiency

Small, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Perovskite-based tandem solar cells (PTSCs) are promising for achieving higher efficiency limits, making them candidates energy supply. However, the commercialization in complex scenarios necessitate extreme stability and reliability of devices, particularly ambient conditions. Herein, use a high-efficiency air-stable quaternary all-polymer bulk heterojunction (BHJ) is pioneered to optimize spectral absorption, facilitate charge transport, suppress exciton recombination, resulting 18.0% power conversion (PCE) organic subcell. The resultant monolithic perovskite/organic cell (POTSC) delivers an impressive PCE 24.8%, with minimal distribution negligible hysteresis. Ambient tests on devices reveal outstanding stability, which attributed reduced increase recombination. Remarkably, unencapsulated device maintained 88% its initial after exposure air 500 h. superior owing enhanced resistance hydrophobic BHJ water oxygen, thereby protecting perovskite active layer. This work provides novel approach from perspective POTSC holds promise future real-world applications field cells.

Язык: Английский

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Dipole Moment Modulation of Terminal Groups Enables Asymmetric Acceptors Featuring Medium Bandgap for Efficient and Stable Ternary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 64(3)

Опубликована: Сен. 9, 2024

Abstract This study puts forth a novel terminal group design to develop medium‐band gap Y‐series acceptors beyond conventional side‐chain engineering. We focused on the strategical integration of an electron‐donating methoxy and electron‐withdrawing halogen atom at benzene‐fused groups. combination precisely modulated dipole moment electron density groups, effectively attenuating intramolecular charge transfer effect, widening band acceptors. The incorporation these groups yielded two asymmetric acceptors, named BTP‐2FClO BTP‐2FBrO, both which exhibited open‐circuit voltage ( V oc ) as high 0.96 in binary devices, representing highest OC s among small molecule More importantly, BTP‐2FBrO exhibit modest aggregation behaviors molecular crystallinity, making them suitable third component mitigate excess PM6 : BTP‐eC9 blend optimize devices’ morphology. As result, optimized BTP‐2FClO‐based ternary organic solar cells (OSCs) achieved remarkable power conversion efficiency (PCE) 19.34 %, positioning it highest‐performing OSCs. Our highlights importance manipulating moments developing offers highly efficient for high‐performance

Язык: Английский

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Regulating Intermolecular Interactions and Film Formation Kinetics for Record Efficiency in Difluorobenzothiadizole‐based Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 64(1)

Опубликована: Сен. 12, 2024

The difluorobenzothiadizole (ffBT) unit is one of the most classic electron-accepting building blocks used to construct D-A copolymers for applications in organic solar cells (OSCs). Historically, ffBT-based polymers have achieved record power conversion efficiencies (PCEs) fullerene-based OSCs owing their strong temperature-dependent aggregation (TDA) characteristics. However, excessive miscibility and rapid kinetics during film formation hindered performance with state-of-the-art non-fullerene acceptors (NFAs). Herein, we synthesized two copolymers, PffBT-2T PffBT-4T, incorporating different π-bridges modulate intermolecular interactions tendencies. Experimental theoretical studies revealed that PffBT-4T exhibits reduced electrostatic potential differences L8-BO compared PffBT-2T. This facilitates improved phase separation active layer, leading enhanced molecular packing optimized morphology. Moreover, demonstrated a prolonged nucleation crystal growth process, Consequently, PffBT-4T-based devices remarkable PCE 17.5 %, setting new photovoltaic polymers. Our findings underscore importance conjugate backbone modulation controlling behavior kinetics, providing valuable insights design high-performance polymer donors photovoltaics.

Язык: Английский

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Spacer Twisting Strategy to Realize Ultrabright Near-Infrared II Polymer Nanoparticles for Fluorescence Imaging-Guided Tumor Phototheranostics

ACS Nano, Год журнала: 2024, Номер 18(41), С. 28178 - 28188

Опубликована: Окт. 3, 2024

Conjugated polymers are becoming popular near-infrared II (NIR-II) phototheranostic agents (PTAs) due to their numerous advantages, such as high photostability, large molar extinction coefficients, and excellent photothermal properties. However, the strong π-π interactions between chains of conjugated resulted in generally low NIR-II emission quantum yields (QY). Therefore, synthesis with QY is an interesting but challenging task. Herein, we proposed a spacer twisting strategy realize ultrabright polymer nanoparticles for fluorescence imaging-guided tumor phototheranostics. Theoretical calculations indicated that PY-IT has largest dihedral angle largely π-conjugated skeleton spacer, which can effectively inhibit intermolecular stacking, resulting improved 16.5% nanoparticles. In addition, NPs perform imaging treatment tumors. The work presents some valuable guides achieving polymeric PTAs QY.

Язык: Английский

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