Dipole Moments Regulation of Biphosphonic Acid Molecules for Self-assembled Monolayers Boosts the Efficiency of Organic Solar Cells Exceeding 19.7%

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(20), С. 14287 - 14296

Опубликована: Май 8, 2024

PEDOT:PSS has been widely used as a hole extraction layer (HEL) in organic solar cells (OSCs). However, their acidic nature can potentially corrode the indium tin oxide (ITO) electrode over time, leading to adverse effects on longevity of OSCs. Herein, we have developed class biphosphonic acid molecules with tunable dipole moments for self-assembled monolayers (SAMs), namely, 3-BPIC(i), 3-BPIC, and 3-BPIC-F, which exhibit an increasing moment sequence. Compared centrosymmetric axisymmetric 3-BPIC 3-BPIC-F higher adsorption energies (Eads) ITO, shorter interface spacing, more uniform coverage ITO surface, better interfacial compatibility active layer. Thanks incorporation fluorine atoms, exhibits deeper highest occupied molecular orbital (HOMO) energy level larger compared resulting enlarged work function (WF) ITO/3-BPIC-F substrate. These advantages could not only improve within device but also lower impedance reduce nonradiative recombination at interface. As result, OSCs using SAM based obtained record high efficiency 19.71%, is than that achieved from 3-BPIC(i) (13.54%) (19.34%). Importantly, 3-BPIC-F-based significantly enhanced stability utilizing HEL. Our offers guidance future design functional SAMs realize even performance cells.

Язык: Английский

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Overcoming optical losses in thin metal-based recombination layers for efficient n-i-p perovskite-organic tandem solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Янв. 2, 2025

Abstract Perovskite-organic tandem solar cells (P-O-TSCs) hold substantial potential to surpass the theoretical efficiency limits of single-junction cells. However, their performance is hampered by non-ideal interconnection layers (ICLs). Especially in n-i-p configurations, incorporation metal nanoparticles negatively introduces serious parasitic absorption, which alleviates photon utilization organic rear cell and decisively constrains maximum photocurrent matching with front cell. Here, we demonstrate an efficient strategy mitigate optical losses Au-embedded ICLs tailoring shape size distribution Au via manipulating underlying surface property. Achieving fewer, smaller, more uniformly spherical significantly minimizes localized plasmon resonance while maintaining electron-hole recombination within ICLs. Consequently, optimized P-O-TSCs combining CsPbI 2 Br various benefit from a current gain >1.5 mA/cm cells, achieving champion 25.34%. Meanwhile, contribute improved long-term device stability.

Язык: Английский

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Inverted organic solar cells with an in situ-derived SiOxNy passivation layer and power conversion efficiency exceeding 18%

Nature Photonics, Год журнала: 2025, Номер unknown

Опубликована: Янв. 9, 2025

Язык: Английский

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Acidic Engineering on Buried Interface toward Efficient Inorganic CsPbI₃ Perovskite Light-Emitting Diodes

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

Inorganic CsPbI3 perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles commercialization progress. Herein, we demonstrate effective acidic engineering strategy with wide applicability modify the surface property of ZnO regulate crystallization. Via systematically selecting 1,4-cyclohexanedicarboxylic acid mild dissociation constant functionalize buried interface, mitigate speed deprotonation reaction achieve homogeneous films phase purity fewer defects. The resulting (PeLEDs) exhibit record EQE 19.4% luminance 3400 cd m–2, representing state-of-art PeLEDs. These findings provide valuable insights advancement efficient

Язык: Английский

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Natural Dextran as an Efficient Interfacial Passivator for ZnO‐Based Electron‐Transport Layers in Inverted Organic Solar Cells

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 12, 2025

Abstract Compared to conventional organic solar cells (OSCs) with acidic PEDOT:PSS as the hole transport layer (HTL), inverted OSCs (i‐OSCs) zinc oxide (ZnO) electron (ETL) display significant advantages in terms of high stability. However, an obvious limitation i‐OSCs is that sol‐gel processed ZnO layers possess detrimental defects at interface, which hinders improvement its photovoltaic performance. To address this problem, a natural, and green dextran (Dex) used efficient interfacial passivator modify layer, thereby achieving enhanced device performance i‐OSCs. The introduction Dex efficiently suppresses recombination loss, resulting higher power conversion efficiencies (PCEs). Interestingly, Dex‐passivated exhibits broad applications ETL for different types i‐OSCs, including fullerene, non‐fullerene, all‐polymer OSCs, D18:Y6 system gives highest PCE 18.32%. This one values reported binary Moreover, application significantly improves stability, T 80 lifetimes based on PM6:Y6, D18:Y6, PM6:PY‐IT exceed 1500 h. These results imply excellent ZnO‐based high‐efficiency stable

Язык: Английский

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A dendritic hexamer acceptor enables 19.4% efficiency with exceptional stability in organic solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Янв. 20, 2025

Язык: Английский

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Insulator Polymer Matrix Construction on All‐Small‐Molecule Photoactive Blend Towards Extrapolated 15000 Hour T₈₀ Stable Devices

Advanced Materials, Год журнала: 2024, Номер 36(35)

Опубликована: Июль 11, 2024

Abstract To boost the stability of all‐small‐molecule (ASM) organic photovoltaic (OPV) blends, an insulator polymer called styrene‐ethylene‐butylene‐styrene (SEBS) as morphology stabilizer is applied into host system small molecules BM‐ClEH:BO‐4Cl. Minor addition SEBS (1 mg/ml in solution) provides a significantly enhanced T 80 value 15000 hours (extrapolated), surpassing doping‐free (0 mg/ml) and heavy doping (10 counterparts (900 hours, 30 hours). The material reproducibility cost‐effectiveness active layer will not be affected by this industrially available polymer, where power conversion efficiency (PCE) can well maintained at 15.02%, which still decent for non‐halogen solvent‐treated ASM OPV. Morphological photophysical characterizations clearly demonstrate SEBS's pivotal effect on suppressing degradation donor blend film's crystallization/aggregation reorganization, protects exciton dynamics effectively. This work pays meaningful attention to stability, performs smart strategy suppress film degradation, releases comprehensive understanding mechanism device performance reduction.

Язык: Английский

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All Roads Lead to Rome: Isomers with Divergent Cathode Modification Mechanisms toward Ohmic Contact

Journal of the American Chemical Society, Год журнала: 2024, Номер unknown

Опубликована: Окт. 25, 2024

Cathode interfacial layers (CILs) hold utmost importance for achieving ohmic contact at the organic semiconductor-cathode interface of photovoltaic devices. Delving deep into diverse design principles and working mechanisms is great significance designing novel CILs with high performance. Herein, two nonamine-based are designed: one featuring a cyclopentadiene unit, designated as CIL-cp; while other, lacking cyclopentadiene, referred to CIL-ph, which an isomer CIL-cp. The subtle changes in chemical structures result distinct modification toward contact. On hand, robust electron-withdrawing characteristic endows CIL-cp lower energy levels, resulting dipole active layer-CIL-cp due electron transfer from D18 other CIL-ph exhibits strong CIL-Ag interface, significantly reduces work function (W

Язык: Английский

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A Fluorinated Imide‐Functionalized Arene Enabling a Wide Bandgap Polymer Donor for Record‐Efficiency All‐Polymer Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Окт. 15, 2024

Abstract All‐polymer solar cells (all‐PSCs) present compelling advantages for commercial applications, including mechanical durability and optical thermal stability. However, progress in developing high‐performance polymer donors has trailed behind the emergence of excellent acceptors. In this study, we report a new electron‐deficient arene, fluorinated bithiophene imide (F‐BTI) its donor SA1, which two fluorine atoms are introduced at outer β ‐positions thiophene rings BTI to fine‐tune energy levels aggregation resulting polymers. SA1 exhibits deep HOMO level −5.51 eV, wide bandgap 1.81 eV suitable miscibility with acceptor. Polymer chains incorporating F‐BTI result highly ordered π–π stacking favorable phase‐separated morphology within all‐polymer active layer. Thus, : PY‐IT‐based all‐PSCs exhibit an efficiency 16.31 % stability, is further enhanced record value 19.33 (certified: 19.17 %) by constructing ternary device. This work demonstrates that offers effective route materials improved optoelectronic properties, will change scenario terms stable all‐PSCs.

Язык: Английский

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Synergistic Modulation of Orientation and Steric Hindrance Induced by Alkyl Chain Length in Ammonium Salt Passivator Toward High‐performance Inverted Perovskite Solar Cells and Modules

Advanced Materials, Год журнала: 2024, Номер 37(1)

Опубликована: Ноя. 17, 2024

Abstract Organic ammonium salts are extensively utilized for passivating surface defects in perovskite films to mitigate trap‐assisted nonradiative recombination. However, the influence of alkyl chain length on molecular orientation and spatial steric hindrance salt remains underexplored, hindering advancements more effective passivators. Here, a series organic is reported with varying lengths passivate optimize band alignment. It revealed that long chains promote parallel surface, thereby reinforcing interaction defects, whereas excessive introduces hindrance, weakening anion‐perovskite interactions. Nonylammonium acetate (NAAc) optimal achieves ideal balance between chemical interactions, resulting superior passivation. Through NAAc passivation, high‐performance inverted solar cells (PSCs) modules achieved, power conversion efficiencies (PCE) 25.79% (certified 25.12%) 19.62%, respectively. This marks record PCE PSCs utilizing vacuum flash technology ambient conditions. Additionally, NAAc‐passivated devices retain 91% their initial after 1200 h continuous maximum point operation. work offers new insights into interplay advancing design PSCs.

Язык: Английский

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