Recent progress in organic solar cells (Part I material science)

Science China Chemistry, Journal Year: 2021, Volume and Issue: 65(2), P. 224 - 268

Published: Dec. 27, 2021

Language: Английский

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Multi‐Selenophene‐Containing Narrow Bandgap Polymer Acceptors for All‐Polymer Solar Cells with over 15 % Efficiency and High Reproducibility

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(29), P. 15935 - 15943

Published: May 3, 2021

Abstract All‐polymer solar cells (all‐PSCs) progressed tremendously due to recent advances in polymerized small molecule acceptors (PSMAs), and their power conversion efficiencies (PCEs) have exceeded 15 %. However, the practical applications of all‐PSCs are still restricted by a lack PSMAs with broad absorption, high electron mobility, low energy loss, good batch‐to‐batch reproducibility. A multi‐selenophene‐containing PSMA, PFY‐3Se, was developed based on selenophene‐fused SMA framework selenophene π‐spacer. Compared its thiophene analogue PFY‐0Se, PFY‐3Se shows ≈30 nm red‐shifted increased improved intermolecular interaction. In all‐PSCs, achieved an impressive PCE 15.1 % both short‐circuit current density 23.6 mA cm −2 fill factor 0.737, which among best values reported date much better than PFY‐0Se (PCE=13.0 %). Notably, maintains similarly properties for realizing reproducible device performance, is first also very rare PSMAs. Moreover, PFY‐3Se‐based show dependence area (0.045–1.0 2 ) active layer thickness (110–250 nm), indicating great potential toward applications.

Language: Английский

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Asymmetric Acceptors Enabling Organic Solar Cells to Achieve an over 17% Efficiency: Conformation Effects on Regulating Molecular Properties and Suppressing Nonradiative Energy Loss

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 11(4)

Published: Dec. 18, 2020

Abstract Y6, as a state‐of‐the‐art nonfullerene acceptor (NFA), is extensively optimized by modifying its side chains and terminal groups. However, the conformation effects on molecular properties photovoltaic performance of Y6 derivatives have not yet been systematically studied. Herein, three analogs, namely, BP4T‐4F, BP5T‐4F, ABP4T‐4F, are designed synthesized. Owing to asymmetric design strategies, representative conformations for Y6‐type NFAs obtained through regulating lateral thiophene orientation fused core. It found that adjustment imposes comprehensive in neat blend films these NFAs. As result, organic solar cells (OSCs) fabricated with PM6:BP4T‐4F, PM6:BP5T‐4F, PM6:ABP4T‐4F show high power conversion efficiency 17.1%, 16.7%, 15.2%, respectively. Interestingly, different also reduced energy loss ( E ) devices via gradually suppressed nonradiative . Moreover, employing selenium‐containing analog, CH1007, complementary third component, ternary OSCs based PM6:BP5T‐4F:CH1007 (1:1.02:0.18) achieve 17.2% efficiency. This work helps shed light engineering voltage loss.

Language: Английский

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High‐Efficiency and Mechanically Robust All‐Polymer Organic Photovoltaic Cells Enabled by Optimized Fibril Network Morphology

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(9)

Published: Dec. 20, 2022

All-polymer organic photovoltaic (OPV) cells possessing high performance and mechanical robustness are promising candidates for flexible wearable devices. However, developing photoactive materials with good properties so far remains challenging. In this work, a polymer donor PBDB-TF weight-average molecular weight (Mw ) is introduced to enable highly efficient all-polymer OPV featuring excellent reliability. By incorporating the high-Mw as third component into PBQx-TF:PY-IT blend, bulk heterojunction morphology finely tuned more compact π-π stacking distance, affording pathways charge transport well stress dissipation. Hence, based on ternary blend film demonstrate maximum power conversion efficiency (PCE) of 18.2% an outstanding fill factor 0.796. The cell delivers decent PCE 16.5% stability. These results present strategy address boost cells.

Language: Английский

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Green‐solvent Processable Dopant‐free Hole Transporting Materials for Inverted Perovskite Solar Cells

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(11)

Published: Jan. 17, 2023

Abstract The commercialization of perovskite solar cells (PVSCs) urgently requires the development green‐solvent processable dopant‐free hole transporting materials (HTMs). However, strong intermolecular interactions that ensure high mobility always compromise solubility and film‐forming ability in green solvents. Herein, we show a simple but effective design strategy to solve this trade‐off, is, constructing star‐shaped D‐A‐D structure. resulting HTMs (BTP1‐2) can be processed by solvent 2‐methylanisole (2MA), kind food additive, multiple defect passivation effects. An impressive efficiency 24.34 % has been achieved for 2MA‐processed BTP1 based inverted PVSCs, highest value so far. Moreover, it is manifested charge separation D‐A type at photoinduced excited state help passivate defects perovskites, indicating new HTM insight.

Language: Английский

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NIR‐II absorbing organic nanoagents for photoacoustic imaging and photothermal therapy

BMEMat, Journal Year: 2023, Volume and Issue: 1(1)

Published: Jan. 30, 2023

Abstract Near‐infrared (NIR) absorbing materials hold great potential in biomedical applications, such as fluorescence imaging (FLI), photoacoustic (PAI), photodynamic therapy (PDT), and photothermal (PTT). Generally, these can be classified into two main categories based on their wavelengths: the first NIR (NIR‐I) (~650–950 nm) second (NIR‐II) (~1000–1700 materials. Due to reduced absorption scattering of NIR‐II light tissue compared NIR‐I light, enable with improved contrast deepened penetration, which is favor practical applications. Various inorganic have been developed for phototheranostics recent years. However, non‐biodegradability toxicity hinder further clinical translation. Biocompatible organic biodegradability well tailored optical property are thus more desired. In this review, we summarize advances nanoagents (ONAs) small molecules (SMs) conjugated polymers (CPs) PAI PTT show our perspectives future challenges development

Language: Английский

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Isomerization of Benzothiadiazole Yields a Promising Polymer Donor and Organic Solar Cells with Efficiency of 19.0%

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(19)

Published: Feb. 2, 2024

The exploration of high-performance and low-cost wide-bandgap polymer donors remains critical to achieve high-efficiency nonfullerene organic solar cells (OSCs) beyond current thresholds. Herein, the 1,2,3-benzothiadiazole (iBT), which is an isomer 2,1,3-benzothiadiazole (BT), used design donor PiBT. PiBT-based reach efficiency 19.0%, one highest efficiencies in binary OSCs. Systemic studies show that isomerization BT iBT can finely regulate polymers' photoelectric properties including i) increasing extinction coefficient photon harvest, ii) downshifting occupied molecular orbital energy levels, iii) improving coplanarity backbones, iv) offering good thermodynamic miscibility with acceptors. Consequently, PiBT:Y6 bulk heterojunction (BHJ) device simultaneously reaches advantageous nanoscale morphology, efficient exciton generation dissociation, fast charge transportation, suppressed recombination, leading larger VOC 0.87 V, higher JSC 28.2 mA cm-2, greater fill factor 77.3%, thus while analog-PBT-based OSCs only 12.9%. Moreover, key intermediate be easily afforded from industry chemicals via two-step procedure. Overall, this contribution highlights a promising motif for designing donors.

Language: Английский

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Control over the aggregated structure of donor–acceptor conjugated polymer films for high‐mobility organic field‐effect transistors

Aggregate, Journal Year: 2024, Volume and Issue: 5(3)

Published: Jan. 15, 2024

Abstract Donor–acceptor (D‐A) conjugated polymers have demonstrated great potential in organic field‐effect transistors application, and their aggregated structure is a crucial factor for high charge mobility. However, the of D‐A polymer films complex structure–property relationship difficult to understand. This review provides an overview recent progress controlling higher mobility, including mechanisms, methods, properties. We first discuss multilevel microstructures films, then summarize current understanding between film transport Subsequently, we theory crystallization. After that, common methods control semi‐crystalline near‐amorphous such as crystallites aggregates, tie chains, alignment, attempt understand them from basic Finally, provide challenges relationship.

Language: Английский

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3D Engineered scaffolds of conjugated polymers/metal organic frameworks for biomedical applications

International Materials Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

The extracellular matrix can be replicated by 3D scaffolds, providing a favorable environment for cell growth, proliferation, and differentiation. Despite their biocompatibility, biodegradability, bioactivity, the poor mechanical strength of scaffolds limits use heavy loads. This creates bottleneck in supply with enhanced all previously mentioned characteristics. Conjugated polymers have emerged as promising option scaffold construction due to electrical conductivity, adjustable surface qualities, ability transfer bioactive molecules. Moreover, metal-organic frameworks (MOFs) are rapidly emerging class nanomaterials uniform porosity, excellent surface-to-volume ratio, variable diverse configurations, well tuanble chemical structures. While both conjugated polymer-based MOF-based suffer from drawbacks such low stability possible toxicity, combination is an imperative strategy construct desirable scaffols biomedical applications. Specific examples investigated polymer-MOF provided each area, along explanation synthesis, fabrication method, physicochemical properties. Finally, applications polymers/MOF tissue engineering cancer theragnostic reviewed, current challenges potential future directions discussed.

Language: Английский

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Squaraine Dyes for Photovoltaic and Biomedical Applications

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 31(12)

Published: Nov. 12, 2020

Abstract Squaraine dyes (SQs) are an important class of polymethine with a unique reasonable‐stabilized zwitterionic structure, in which electrons highly delocalized over the conjugated bridge. These can not only be easily synthesized via condensation, but also exhibit intense absorption and emission visible near‐infrared region excellent photochemical stability, making them attractive material candidates for many photoelectric biomedical applications. Thus, this review, after introduction SQs, recent advances SQs photovoltaic field comprehensively summarized including dye‐sensitized solar cells, organic perovskite cells. Then, use as biosensors, biological imaging, photodynamic/photothermal therapy reagents discussed. Finally, summary outlook will provided some new perspectives future design SQs.

Language: Английский

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