Achieving 20.8% organic solar cells via additive-assisted layer-by-layer fabrication with bulk p-i-n structure and improved optical management

Joule, Год журнала: 2024, Номер 8(11), С. 3153 - 3168

Опубликована: Авг. 29, 2024

Язык: Английский

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Double Hole Transport Layers Enable 20.42% Efficiency Organic Solar Cells by Aggregation Control of Self‐Assembled Molecules on Cobalt Salt Surfaces

Small, Год журнала: 2025, Номер unknown

Опубликована: Март 26, 2025

Heterojunction interfaces play a crucial role in charge carrier transport, influencing the overall photovoltaic performance of organic solar cells (OSCs). Despite importance, advancements interfacial engineering, especially optimizing microstructure and nanomorphology, have not kept pace with research on photoactive layers. In study, strategy is explored to control self-assembly growth alcohol-soluble Me-4PACz (4P) used as hole transport layer (HTL) OSCs. The surface architecture modified inorganic Co salts via Cu doping UV-ozone treatments, creating smooth top an increased Co3+/Co2+ ratio hydroxyl groups. This meticulous design fine-tuned assembly behavior self-assembled molecules, resulting transition from spherical aggregates more uniform worm-like morphology. Additionally, electrical optical properties are optimized passivate defects enhance wettability solvents, leading improved extraction reduced recombination losses. Consequently, OSC Cu-Co/4P HTL exhibited highest power conversion efficiency 20.42% (certified 20.20%). characteristic universality stability make potential candidate for widespread applications, particularly providing rationalized guidance further

Язык: Английский

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Post-Treatment Free Yttrium Phosphotungstate Anode Interfacial Material for Organic Solar Cells with 20.55% Efficiency

ACS Energy Letters, Год журнала: 2025, Номер unknown, С. 2045 - 2051

Опубликована: Апрель 1, 2025

Язык: Английский

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Binary Organic Solar Cells with >19.6% Efficiency: The Significance of Self-Assembled Monolayer Modification

ACS Energy Letters, Год журнала: 2024, Номер 9(9), С. 4209 - 4217

Опубликована: Авг. 1, 2024

Improving the uniformity and density of self-assembled monolayers (SAMs) is crucial to elevate photovoltaic performance organic solar cells (OSCs). Herein, we introduced small molecules 1-hydroxybenzotriazole (HOBT) modulate distribution electrical properties (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid (4PADCB) on indium tin oxide (ITO) transparent electrodes in an innovative manner. The hydroxyl group HOBT interacts with phosphate SAMs, while steric repulsion exerted by backbone efficiently regulates SAMs. This led a more uniform dense SAMs ITO. Furthermore, HOBT-modified have improved crystallization vertical phase separation upper active layer. Consequently, PM6:BTP-eC9 binary OSCs based exhibit impressive PCE 19.66%. Our work presents effective strategy for regulating SAM morphology offers promising approach advancing OSCs.

Язык: Английский

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Local Dipole Modulation Toward High Fill Factor in Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(41)

Опубликована: Авг. 12, 2024

Abstract Dipole moment arrangement in organic semiconductors plays a critical role affecting the intermolecular packing, determining optoelectronic properties and device performance. Here, to get desired fill factor (FF) values solar cells (OSCs), local dipole of non‐fullerene acceptors (NFAs) is modulated by changing molecular asymmetries. Two NFAs, AA‐1 AA‐2 are designed synthesized, which have different substitutions alkyl alkoxyl groups. The unidirectional asymmetry creates distinct dipoles, while bidirectional mitigates variation. Despite minimal impact on monomolecular properties, significantly influences terminal group packing modes film state. This, turn, enhances relative dielectric constant, prolongs exciton lifetime, reduces sub‐bandgap defect states. Consequently, PBDB‐TF:AA‐2‐based OSCs achieve an exceptional FF 0.830 power conversion efficiency (PCE) 18.3%, with ternary reaching PCE 19.3%. This work highlights potential modulation material design ideal for high‐performance OSCs.

Язык: Английский

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Molecular Design of Hole-Collecting Materials for Co-Deposition Processed Perovskite Solar Cells: A Tripodal Triazatruxene Derivative with Carboxylic Acid Groups

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

High-performance and cost-effective hole-collecting materials (HCMs) are indispensable for commercially viable perovskite solar cells (PSCs). Here, we report an anchorable HCM composed of a triazatruxene core connected with three alkyl carboxylic acid groups (3CATAT-C3). In contrast to the phosphonic acid-containing tripodal analog (3PATAT-C3), 3CATAT-C3 molecules can form hydrophilic monolayer on transparent conducting oxide surface, which is beneficial subsequent film deposition in traditional layer-by-layer fabrication process. More importantly, larger diffusion coefficient higher surface energy make suitable simplified, one-step co-deposition process was directly added as part precursor solution. predominantly located at bottom after spin-coating mixed solution, facilitating charge extraction. Devices fabricated by this method exhibit superior performance champion power conversion efficiency over 23%. The unencapsulated devices showed good operational stability (retaining 90% initial output 100 h), thermal durability 95% value heating 105 °C under air), excellent storage (showing no drop 8000 h). Based results time-of-flight secondary-ion mass spectroscopy (ToF-SIMS) order nuclear magnetic resonance (DOSY), elucidated effect anchoring HCMs PSCs well mechanism Our findings provide valuable insights molecular design multifunctional materials, further advancing cells.

Язык: Английский

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A Brief Review on Self-Assembled Monolayers in Organic Solar Cells: Progress, Challenges, and Future Prospects

ACS Applied Electronic Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

Over the past decade, organic solar cells (OSCs) have made noticeable progress in photovoltaic performance thanks to emergence of electron acceptors capable intramolecular charge transfer, namely, nonfullerene small molecules. OSCs continue gain momentum by employing self-assembled monolayers (SAMs) as transport layers, particularly those involving conjugated system their functional groups and/or spacers. This review provides an overview SAMs, covering molecular designs, fabrication methods, and various functions OSCs. Additionally, it highlights currents issues surrounding along with efforts address them future perspectives.

Язык: Английский

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Progress in the Stability of Small Molecule Acceptor‐Based Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 5, 2024

Abstract Significant advancements in power conversion efficiency have been achieved organic solar cells with small molecule acceptors. However, stability remains a primary challenge, impeding their widespread adoption renewable energy applications. This review summarizes the degradation of different layers within device structure under varying conditions, including light, heat, moisture, and oxygen. For photoactive layers, chemical pathways polymer donors acceptors are examined detail, alongside morphological bulk heterojunction structure, which plays crucial role performance. The mechanisms commonly used anode cathode interlayers electrodes addressed, as these significantly influence overall stability. Mitigation methods for identified provided each section to offer practical insights improving longevity. Finally, an outlook presents remaining challenges achieving long‐term stability, emphasizing research directions that require further investigation enhance reliability performance real‐world

Язык: Английский

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U‐Shaped Dimeric Acceptors for Balancing Efficiency and Stability in Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 27, 2024

Abstract Despite significant improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs), achieving excellent stability remains a great challenge to their commercial feasibility. Here, U ‐shaped dimeric acceptors (5‐IDT and 6‐IDT) with different molecular lengths are introduced into the binary OSCs as third component, respectively. The introduction component effectively reduces energetic disorder non‐radiative voltage losses improves exciton dissociation charge transport devices. Consequently, PCEs 6‐IDT‐ 5‐IDT‐treated significantly improved 19.32% 19.96%, respectively, which is highest PCE for oligomeric acceptors‐based ternary date. Meanwhile, thermal treated devices dramatically improved, initial efficiency retention increasing from 18% 32% 75%, after 1000 h stress. This mainly attributed ability smaller length 5‐IDT stabilize phase‐separated morphology polymeric donor small acceptor, rather than high glass transition temperature low diffusion coefficient.

Язык: Английский

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Central fluorination strategy of biphosphonic acid molecule for self-assembled monolayer enables efficient organic solar cells

Science China Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 14, 2025

Язык: Английский

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