Journal of Materials Chemistry C, Год журнала: 2024, Номер 13(5), С. 2183 - 2189
Опубликована: Дек. 3, 2024
In this work, a novel low melting temperature solid additive CB8-Br was designed and synthesized through simple reliable method, superior PCE of 18.12% with excellent device stability obtained in CB8-Br-processed devices.
Язык: Английский
ACS Sustainable Chemistry & Engineering, Год журнала: 2025, Номер unknown
Опубликована: Янв. 9, 2025
The rapid development of organic solar cells (OSCs) has been particularly remarkable following the introduction high-performance small molecule electron acceptor Y6 and its derivatives. Despite advances in state-of-the-art OSCs, challenges remain, notably relatively low open circuit voltage (VOC) charge mobility imbalance, which continue to hinder further improvements OSCs' performance. To address these issues, this work, we synthesized a main-chain twisted wide bandgap i-IEDTB, not only possesses superior hole over but also higher lowest unoccupied molecular orbital (LUMO) energy levels, adopted it as bifunctional third compound couple with terpolymer Z10 based OSC system. integration i-IEDTB Z10:Y6 blend, either an or donor, significantly reduces excessive aggregation facilitates harmonized distribution mobilities by modulating crystallization properties materials. This strategic intervention leads marked improvement VOC fill factor (FF). Consequently, power conversion efficiency (PCE) optimized Z10:(Y6:i-IEDTB) ternary device is elevated impressive 17.70%, surpassing 16.50% binary OSC. Besides, after doping 5% weight replaced that Z10, device's VOC, FF were increased 0.846 V 78.08% respectively, resulting enhanced PCE 17.47%. Further investigation demonstrates universality PM6:BTP-eC9-based PM6:L8-BO-based achieving champion efficiencies 18.14 18.08%, respectively. work highlights key role complementary component crystallographic order carrier balance within Y-type acceptor-based OSCs.
Язык: Английский
Процитировано
3
Advanced Science, Год журнала: 2024, Номер 11(31)
Опубликована: Июнь 17, 2024
Abstract Halogenation of Y‐series small‐molecule acceptors (Y‐SMAs) is identified as an effective strategy to optimize photoelectric properties for achieving improved power‐conversion‐efficiencies (PCEs) in binary organic solar cells (OSCs). However, the effect different halogenation 2D‐structured large π‐fused core guest Y‐SMAs on ternary OSCs has not yet been systematically studied. Herein, four 2D‐conjugated (X‐QTP‐4F, including halogen‐free H‐QTP‐4F, chlorinated Cl‐QTP‐4F, brominated Br‐QTP‐4F, and iodinated I‐QTP‐4F) by attaching halogens into 2D‐conjugation extended dibenzo[ f , h ]quinoxaline are developed. Among these X‐QTP‐4F, Cl‐QTP‐4F a higher absorption coefficient, optimized molecular crystallinity packing, suitable cascade energy levels, complementary with PM6:L8‐BO host. Moreover, among PM6:L8‐BO:X‐QTP‐4F blends, PM6:L8‐BO:Cl‐QTP‐4F obtains more uniform size‐suitable fibrillary network morphology, well vertical phase distribution, thus boosting charge generation, transport, extraction, suppressing loss OSCs. Consequently, PM6:L8‐BO:Cl‐QTP‐4F‐based achieve 19.0% efficiency, which state‐of‐the‐art based superior devices host (17.70%) guests H‐QTP‐4F (18.23%), Br‐QTP‐4F (18.39%), I‐QTP‐4F (17.62%). The work indicates that promising gain efficient
Язык: Английский
Процитировано
14
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Окт. 22, 2024
Abstract The ideal vertical phase separation active layer morphology is crucial for the photoelectric conversion of organic solar cells. In this work, a layer‐by‐layer sequential deposition method used to prepare D18/L8‐BO‐based cells and dual additives strategy adopted construct layer. Additive DIM regulates crystallization D18 layer, additive DIO induces L8‐BO diffuse into interior form composition distribution with large donor/acceptor interpenetrated regions. improvement induced by promote exciton generation dissociation, shorten charge transfer distance, improve carrier dynamics. With improved transport performance suppressed recombination, short‐circuit current density fill factor D18/L8‐BO quasi‐bulk heterojunction are simultaneously, power efficiency boosted significantly from 18.21% 19.59%. Moreover, photovoltaic further verified in D18/Y6 PM6/L8‐BO‐based cells, which implies generalizability additive‐assisted ‐sequential method.
Язык: Английский
Процитировано
9
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 5, 2025
Abstract Conjugated polymers can undergo complex, concentration‐dependent self‐assembly during solution processing, yet little is known about its impact on film morphology and device performance of organic solar cells. Herein, lyotropic liquid crystal (LLC) mediated assembly across multiple conjugated reported, which generally gives rise to improved blade‐coated non‐fullerene bulk heterojunction Using D18 as a model system, the formation mechanism LLC unveiled employing X‐ray scattering microscopic imaging tools: first aggregates into semicrystalline nanofibers, then assemble achiral nematic goes through symmetry breaking yield chiral twist‐bent LLC. The pathway driven by increasing concentration – common driving force evaporative relevant scalable manufacturing. This be largely modulated coating regimes give 1) crystalline in evaporation regime 2) random fiber aggregation Landau–Levich regime. resulted films with crystallinity 2.63 times that from pathway, significantly enhancing T80 lifetime 50‐fold. generality LLC‐mediated enhanced further validated using polythiophene quinoxaline‐based donor polymers.
Язык: Английский
Процитировано
1
Energy & Fuels, Год журнала: 2025, Номер unknown
Опубликована: Фев. 14, 2025
In this study, we have successfully incorporated a small molecular acceptor, Y-LC, with conjugated π-extension as secondary acceptor in the PM6:BTP-eC9-based organic photovoltaics. The performance of device was significantly promoted from 18.45% binary system PM6:BTP-eC9 to over 19% ternary minimal Y-LC loading. This enhancement can be attributed alloy-like structures acceptors and optimized active layer morphology, which leads improved hole electron mobilities, thereby suppressing charge recombination, finally resulting higher photocurrent solar cells. Furthermore, complementary absorption is observed PM6 BTP-eC9, broaden spectrum photoactive enable more photons sunlight absorbed. Additionally, facilitates efficient transfer donor by forming cascade energy levels between BTP-eC9. These advantages collectively contribute superior obtained work also highlights that adoption nonfullerene suitable π-extensions minor additive photovoltaics powerful approach for achieving state-of-the-art
Язык: Английский
Процитировано
1
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Сен. 9, 2024
Abstract Organic solar cells (OSCs) are gaining attention in building‐integrated and agricultural photovoltaics due to their light weight, mechanical flexibility, low‐cost solution processability. To achieve commercial viability, understanding the relationships between active layer material structure, film morphology, photovoltaic performance is crucial. Nanoscale infrared spectroscopy coupled with atomic force microscopy (nanoIR‐AFM) offers an advanced characterization of morphology at high resolution help understand OSC performance. This review outlines recent developments applications nanoIR‐AFM research, detailing its principles, instruments, functions. Strategies enhance morphological by discussed, offering insights into evolution device The highlights challenges faced potential role advancing technology. As continues evolve, it will play a critical development, providing essential technical means for further progress.
Язык: Английский
Процитировано
6
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(28), С. 36705 - 36714
Опубликована: Июль 3, 2024
Great progress has been made in organic solar cells (OSCs) recent years, especially after the report of highly efficient small-molecule electron acceptor Y6. However, relatively low open circuit voltage (VOC) and unbalanced charge mobilities remain two issues that need to be resolved for further improvement performance OSCs. Herein, a wide-band-gap amorphous IO-4Cl, which possessed shallower lowest unoccupied molecular orbital (LUMO) energy level than Y6, was introduced into PM6:Y6 binary system construct ternary device. The mechanism study revealed IO-4Cl alloyed with Y6 prevent overaggregation offer dual channels effective hole transportation, resulting balanced mobilities. Taking these advantages, an enhanced VOC 0.894 V improved fill factor 75.58% were achieved optimized PM6:Y6:IO-4Cl-based device, yielding promising power conversion efficiency (PCE) 17.49%, surpassed 16.72% This work provides alternative solution balance PM6:Y6-based devices by incorporating high-performance LUMO A–D–A small molecule as third compound.
Язык: Английский
Процитировано
5
Small, Год журнала: 2024, Номер 20(46)
Опубликована: Авг. 6, 2024
Abstract Volatile solid additives have emerged as a promising strategy for enhancing film morphology and promoting the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, series novel polycyclic aromatic with analogous chemical structures, including fluorene (FL), dibenzothiophene (DBT), dibenzofuran (DBF) derived from crude oils, are presented incorporated into OSCs. All these exhibit strong interactions electron‐deficient terminal groups L8‐BO within bulk‐heterojunction Moreover, they demonstrate significant sublimation during thermal annealing, leading to increase free volumes rearrangement recrystallization L8‐BO. This phenomenon leads an improved elevated glass‐transition temperature photoactive layers. Consequently, PCE PM6:L8‐BO blend has been boosted 16.60% 18.60% 40 wt% DBF additives, champion 19.11% achieved ternary PM6:L8‐BO:BTP‐eC9 Furthermore, prolonged shelf stability observed in OSCs additives. study emphasizes synergic effect volatile on performance OSCs, highlighting their potential advancing field photovoltaics.
Язык: Английский
Процитировано
5
Chinese Journal of Chemistry, Год журнала: 2024, Номер unknown
Опубликована: Сен. 16, 2024
Comprehensive Summary The ternary strategy has demonstrated its efficacy in improving charge transport organic solar cells (OSCs). Here, three novel non‐fullerene acceptors, SN6C9‐4F, SN6C9‐4Cl and SN6C10‐4F, based on S,N‐heteroacene linear backbone were designed synthesized. acceptors exhibit excellent molecular coplanarity, high crystallinity possess a deep‐lying lowest unoccupied orbital energy level, which is beneficial for injection field‐effect transistors (OFETs). Notably, the OFET devices all achieved impressive electron mobilities, with SN6C10‐4F achieving up to 0.73 cm 2 ·V –1 ·s , one of highest values among A‐D‐A type small molecules. In addition, OSCs device PBDB‐T:SN6C9‐4F exhibited best power conversion efficiency 12.07% owing optimal morphology enhanced transport. Moreover, incorporation SN6C9‐4F into efficient PM6:L8‐BO binary system form resulted extended absorption range, donor crystallization, improved more balanced transport, ultimately leading an improvement PCE from 17.78% 18.32%. This study highlights potential developing distinct structures Y‐series broaden regulate providing approach enhance OSCs.
Язык: Английский
Процитировано
4
Advanced Energy Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 3, 2025
Abstract Metal–organic complexes have demonstrated excellent performance in organic light‐emitting diodes, yet their potential solar cells (OSCs) remains underexplored. In this study, a novel metal–organic complex, Pt‐Y, which features platinum core connected to Y‐acceptor arms, for application OSCs is designed and synthesized. The dimerized Pt‐Y acceptor prepared through straightforward reactions, with the key precursor linking metal Y‐acceptors synthesized Sonogashira coupling. Steady‐state transient photoluminescence measurements revealed that exhibits distinct singlet triplet states microsecond lifetimes—significantly longer than nanosecond lifetimes of without metal. Incorporating as third component ternary has resulted remarkable efficiency 19.2%. Further morphological analysis absorption indicate displays miscibility Y‐acceptor, leading minimal phase separation formation fibrillar structures. These structures enhance charge transport while reducing recombination. This work presents facile approach developing exceptional photovoltaic OSCs.
Язык: Английский
Процитировано
0