Tuning of the Polymeric Nanofibril Geometry via Side-Chain Interaction toward 20.1% Efficiency of Organic Solar Cells

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

Опубликована: Дек. 2, 2024

Constructing fibril morphology has been believed to be an effective method of achieving efficient exciton dissociation and charge transport in organic solar cells (OSCs). Despite emerging endeavors on the fibrillization semiconductors via chemical structural design or physical manipulation, tuning geometry, i.e., width length, for tailored optoelectronic properties remains studied depth. In this work, a series alkoxythiophene additives featuring varied alkyl side chains connected thiophene are designed modulate growth aggregates cutting-edge polymer donors PM6 D18. Molecular dynamics simulations morphological characterizations reveal that these preferentially locate near entangle with donors, which enhance conjugated backbone stacking form nanofibrils expanding from 12.6 21.8 nm length increasing 98.3 232.7 nm. This nanofibril structure is feasible acquire simultaneously. By integrating L8-BO as donor acceptor layers pseudo-bulk heterojunction (p-BHJ) OSCs layer-by-layer deposition, improvement power conversion efficiency (PCE) 18.7% 19.8% observed, contributed by enhanced light absorption, transport, reduced recombination. The versatility also verified D18:L8-BO OSCs, PCE 19.3% 20.1%, among highest values reported OSCs.

Язык: Английский

---

Recent Progress of Solution‐Processed Thickness‐Insensitive Cathode Interlayers for High‐Performance Organic Solar Cells

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 5, 2025

Abstract Organic solar cells (OSCs) have shown great applications potential in flexible/wearable electronics, indoor photovoltaics and so on. The efficiencies of single‐junction OSCs exceeded 19%, making the commercialization brighter. Large‐area printing fabrication is a key way to OSCs, solution‐processed thickness‐insensitive cathode interlayers (CILs) are urgently needed for large‐area fabrication. High electron mobility interfacial materials (CIMs) critical enable CILs. N‐type self‐doped characteristics can endow organic CIMs with high mobility. Different type n‐type show different applicability conventional inverted OSCs. External dopants further increase hybrid blends. Particularly, ZnO doped dyes achieve superior photoconductivity This review focuses on CILs high‐performance In small molecules polymers, external n‐doped blends as summarized. small‐molecular electrolytes polyelectrolytes, PEI‐/PEIE‐based (including organic‐organic ZnO‐organic) summarized relationships between particular functions chemical structures highlighted. Finally, summary outlook provided.

Язык: Английский

---

Extending Exciton Diffusion Length via an Organic‐Metal Platinum Complex Additive for High‐Performance Thick‐Film Organic Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 6, 2025

The long exciton diffusion length (LD) plays an important role in promoting dissociation, suppressing charge recombination, and improving the transport process, thereby performance of organic solar cells (OSCs), especially thick-film OSCs. However, limited LD hinders further improvement device as film thickness increases. Here, organic-metal platinum complex, namely TTz-Pt, is synthesized served a solid additive into D18-Cl:L8-BO system. addition TTz-Pt enhanced crystallinity blends, reduced energy disorder, trap density, decreased non-radiative recombination binding energy, which conducive to prolonging TTz-Pt-treated film, facilitating dissociation process along with inhibiting recombination. Consequently, D18:L8-BO:IDIC (100 nm) exhibits champion power conversion efficiency (PCE) 20.12% (certified 19.54%), one highest PCEs reported for OSCs date. Remarkably, record-breaking PCE 18.84% yielded active layer 300 nm. Furthermore, superior universality This work provides simple universal approach extending by introducing complex achieve highly efficient

Язык: Английский

---

Polymer-like tetramer acceptor enables stable and 19.75% efficiency binary organic solar cells

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

Опубликована: Фев. 20, 2025

Abstract Limited by large batch differences and inferior polymerization degree of current polymer acceptors, the potential high efficiency stability advantages all-polymer solar cells (all-PSCs) cannot be fully utilized. Alternatively, largely π-extended structurally definite oligomer acceptors are effective strategies to realize overall performance acceptors. Herein, we report a linear tetramer acceptor namely 4Y-BO with identical molecular skeleton comparable molecular-weight relative control PY-BO. The shows refined film-forming kinetics improved ordering, offering uniform crystallinity donor hence well-defined fibrous heterojunction textures. Encouragingly, PM6:4Y-BO devices achieve an up 19.75% (certified efficiency:19.58%), surpassing that PM6:PY-BO device (15.66%) ranks highest among based on More noticeably, thermal stability, photostability mechanical flexibility collectively enhanced for devices. Our study provides important approach fabricating stable organic photovoltaics.

Язык: Английский

---

Multi‐Selenophene Strategy Enables Dimeric Acceptors‐Based Organic Solar Cells with over 18.5% Efficiency

Advanced Energy Materials, Год журнала: 2024, Номер 14(30)

Опубликована: Май 9, 2024

Abstract Dimeric acceptor (DMA) becomes a promising alternative to small‐molecular and polymeric acceptor‐based organic solar cells (OSCs) due its well‐defined chemical structure, high batch‐to‐batch reproducibility, low molecular diffusion properties. However, DMAs usually exhibit blueshifted absorptions, limiting their photon utilization abilities. Herein, multi‐selenophene strategies are adopted develop redshifted DMAs. From monomer (YSe) dimers (DYSe‐1 DYSe‐2), reduced electron reorganization energies exciton binding enable the efficient charge dynamics in DMAs‐based OSCs. Together with effective absorption extending ≈920 nm, DYSe‐1‐ DYSe‐2‐ based OSCs outstanding short‐circuit current densities ( J SC s) over 27 mA cm −2 , which best among Besides, compared YSe‐based device, both DMA‐based devices have higher electroluminescence quantum efficiencies thus reduce nonradiative recombination loss (ΔE 3 ), contributing energy losses. The resultant open‐circuit voltages V OC of ≈0.88 V, which, combining super values, lead power conversion 18.56% 18.22%, respectively. These results highlight great potential strategy for development performance.

Язык: Английский

---

Asymmetrified Benzothiadiazole‐Based Solid Additives Enable All‐Polymer Solar Cells with Efficiency Over 19 %

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

Опубликована: Авг. 24, 2024

Disordered polymer chain entanglements within all-polymer blends limit the formation of optimal donor-acceptor phase separation. Therefore, developing effective methods to regulate morphology evolution is crucial for achieving morphological features in organic solar cells (APSCs). In this study, two isomers, 4,5-difluorobenzo-c-1,2,5-thiadiazole (SF-1) and 5,6-difluorobenzo-c-1,2,5-thiadiazole (SF-2), were designed as solid additives based on widely-used electron-deficient benzothiadiazole unit nonfullerene acceptors. The incorporation SF-1 or SF-2 into PM6 : PY-DT blend induces stronger molecular packing via interaction, leading continuous interpenetrated networks with suitable phase-separation vertical distribution. Furthermore, after treatment SF-2, exciton diffusion lengths films are extended over 40 nm, favoring charge transport. asymmetrical characterized by an enhanced dipole moment, increases power conversion efficiency (PCE) PY-DT-based device 18.83 % due electrostatic interactions. Moreover, a ternary strategy boosts PCE SF-2-treated APSC 19 %. This work not only demonstrates one best performances APSCs but also offers approach manipulate using rational-designed additives.

Язык: Английский

---

Solid Additive Engineering for Next‐generation Organic Photovoltaics

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 22, 2024

Abstract Solution‐processed bulk heterojunction (BHJ) organic solar cells (OSCs) have emerged as a promising next‐generation photovoltaic technology. In this emerging field, there is growing trend of employing solid additives (SAs) to fine‐tune the BHJ morphology and unlock full potential OSCs. SA engineering offers several significant benefits for commercialization, including ability i) control film‐forming kinetics expedite high‐throughput fabrication, ii) leverage weak noncovalent interactions between materials enhance efficiency stability OSCs, iii) simplify procedures facilitate cost‐effective production scaling‐up. These features make key catalyst accelerating development Recent breakthroughs shown that can achieve an 19.67% in single‐junction demonstrating its effectiveness promoting commercialization devices. This review provides comprehensive overview pivotal contributions SAs, focusing on their roles governing dynamics, stabilizing phase separation, addressing other crucial aspects. The rationale design rules SAs highly efficient stable OSCs are also discussed. Finally, remaining challenges summarized, perspectives future advances offered.

Язык: Английский

---

Electrohydrodynamic Inkjet Printing of Three-Dimensional Perovskite Nanocrystal Arrays for Full-Color Micro-LED Displays

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(19), С. 24908 - 24919

Опубликована: Май 6, 2024

Perovskite nanocrystal (PeNC) arrays are showing a promising future in the next generation of micro-light-emitting-diode (micro-LED) displays due to narrow emission linewidth and adjustable peak wavelength. Electrohydrodynamic (EHD) inkjet printing, with merits high resolution, uniformity, versatility, cost-effectiveness, is among competent candidates for constructing PeNC arrays. However, fabrication red light-emitting CsPbBrxI(3–x) micro-LED still faces challenges, such as low brightness poor stability. This work proposes design colloidal ink that specialized EHD printing three-dimensional enhanced luminescence stability well being adaptable both rigid flexible substrates. Made mixture PeNCs, polymer polystyrene (PS), nonpolar xylene solvent, enables precise control array sizes shapes, which facilitates on-demand micropillar construction. Additionally, inclusion PS significantly increases environmental By adopting this ink, printer successfully fabricated full-color 3D spatial resolution over 2500 ppi. It shows potential strategy high-resolution robust color conversion layers displays.

Язык: Английский

---

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

---

Quasi-Planar Heterojunction: Enhancing Stability and Practicality in Organic Photovoltaics

ACS Energy Letters, Год журнала: 2025, Номер unknown, С. 935 - 946

Опубликована: Янв. 24, 2025

Язык: Английский

---