Device Performance of Emerging Photovoltaic Materials (Version 4)

Advanced Energy Materials, Год журнала: 2023, Номер 14(4)

Опубликована: Дек. 15, 2023

Abstract Following the 3rd release of “Emerging PV reports” , best achievements in performance emerging photovoltaic (e‐PV) devices diverse e‐PV research subjects are summarized, as reported peer‐reviewed articles academic journals since August 2022. Updated graphs, tables, and analyses provided with several parameters, such power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization stability test energy yield. These parameters presented a function bandgap average visible transmittance for each technology application, put into perspective using, example, detailed balance efficiency limit. The 4th installment discusses “PV emergence” classification respect to generations” waves” highlights latest device progress multijunction flexible photovoltaics. Additionally, Dale‐Scarpulla's plots efficiency‐effort terms cumulative publication count also introduced.

Язык: Английский

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Alkoxy Modification of the Terminal Group in Nonfullerene Acceptors to Achieve Efficient Ternary Organic Solar Cells With a High Open‐Circuit Voltage

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Abstract Y‐series nonfullerene acceptors (NFAs) usually bear halogenated end groups to achieve narrow bandgaps and tunable molecules crystallinity; however, it results in small open‐circuit voltage ( V oc ) of 0.8–0.9 V. Here, three NFAs BTP‐eC9‐G51, BTP‐eC9‐G52, BTP‐eC9‐G53 are synthesized by introducing both an electron‐withdrawing fluoro group electron‐donating alkoxy commonly used 2‐(3‐oxo‐2,3‐dihydroinden1‐ylidene)‐malononitrile (IC) terminal groups. These compounds demonstrate a high larger than 0.9 when employed as organic solar cells (0.91 for BTP‐eC9‐G51 0.95 the others). The effect chain length on photoelectric properties is systematically studied. show that dipole moments aggregation behaviors these changes obviously with increase length. active layer based shows suitable phase separation structure good charge transport. Devices device efficiency 16.65%, higher those BTP‐eC9‐G52 devices (14.33% 13.24%, respectively). Furthermore, introduced into D18:L8‐BO third component, which improves J sc , reduces nonradiation energy loss, increased 19.03% 0.92

Язык: Английский

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Optimized Crystal Framework by Asymmetric Core Isomerization in Selenium‐Substituted Acceptor for Efficient Binary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(49)

Опубликована: Окт. 12, 2023

Both the regional isomerization and selenium-substitution of small molecular acceptors (SMAs) play significant roles in developing efficient organic solar cells (OSCs), while their synergistic effects remain elusive. Herein, we developed three isomeric SMAs (S-CSeF, A-ISeF, A-OSeF) via subtly manipulating mono-selenium substituted position (central, inner, or outer) type heteroaromatic ring on central core by strategies for OSCs, respectively. Crystallography asymmetric A-OSeF presents a closer intermolecular π-π stacking more ordered 3-dimensional network packing charge-hopping pathways. With successive out-shift position, neat films give slightly wider band gap gradually higher crystallinity electron mobility. The PM1 : afford favourable fibrous phase separation morphology with charge transportation compared to other two counterparts. Consequently, A-OSeF-based devices achieve champion efficiency 18.5 %, which represents record value reported selenium-containing binary OSCs. Our precise engineering selenium-based provides promising approach optimizing crystal boosting top-ranked SMAs-based

Язык: Английский

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The Asymmetric Strategy of Small‐Molecule Materials for Organic Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер 14(17)

Опубликована: Фев. 8, 2024

Abstract The conjugated small‐molecule materials of organic solar cells have always played a crucial role in light‐harvesting, charge transport, morphology optimization, and the attainment efficient devices. advancement novel understanding underlying molecular design rules serve as driving force for furthering stable photovoltaic Among variety principles, symmetry‐breaking strategy, which is well developed 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d’]‐s‐indaceno[1,2‐b:5,6‐b’]dithiophene (ITIC)‐series acceptors, recently demonstrates great potential acceptors donors realizing high power conversion efficiency. In this review, order to give deep insight on asymmetric are systematically summarized with structure elucidate structure‐performance relationship, packing behaviors, evolution. Not only delicate balance between open circuit voltage short‐circuit current density, but also reductions recombination non‐radiative considered play key points improving performance when molecule used host or guest materials. Finally, concise challenges outlooks provided future development application molecules strategies.

Язык: Английский

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Selenium substitution for dielectric constant improvement and hole-transfer acceleration in non-fullerene organic solar cells

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 7, 2024

Abstract Dielectric constant of non-fullerene acceptors plays a critical role in organic solar cells terms exciton dissociation and charge recombination. Current feature dielectric 3-4, correlating to relatively high recombination loss. We demonstrate that selenium substitution on acceptor central core can effectively modify molecule constant. The corresponding blend film presents faster hole-transfer ~5 ps compared the sulfur-based derivative (~10 ps). However, blends with Se-acceptor also show after 100 upon optical pumping, which is explained by disordered stacking Se-acceptor. Encouragingly, dispersing an optimized cell system interrupt aggregation while still retain With improved fibril morphology, ternary device exhibits obvious reduction non-radiative 0.221 eV efficiency 19.0%. This work unveils heteroatom-substitution induced improvement, associated dynamics morphology manipulation, finally contributes better material/device design performance.

Язык: Английский

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The Influence of Donor/Acceptor Interfaces on Organic Solar Cells Efficiency and Stability Revealed through Theoretical Calculations and Morphology Characterizations

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(10)

Опубликована: Янв. 8, 2024

Abstract End‐groups halogenation strategies, generally refers to fluorination and chlorination, have been confirmed as simple efficient methods regulate the photoelectric performance of non‐fullerene acceptors (NFAs), but a controversy over which one is better has existed for long time. Here, two novel NFAs, C9N3‐4F C9N3‐4Cl, featured with different end‐groups were successfully synthesized blended renowned donors, D18 PM6, electron‐withdrawing units. Detailed theoretical calculations morphology characterizations interface structures indicate NFAs based on possess binding energy miscibility shows an obvious influence phase‐separation morphology, charge transport behavior device performance. After verified by other three pairs reported universal conclusion obtained devices fluorination‐end‐groups‐based PM6 chlorination‐end‐groups‐based show excellent efficiencies, high fill factors stability. Finally, D18: PM6: C9N3‐4Cl yield outstanding efficiency 18.53 % 18.00 %, respectively. Suitably selecting donor regulating donor/acceptor can accurately present conversion ability points out way further molecular design selection high‐performance stable organic solar cells.

Язык: Английский

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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

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A Difluoro‐Methoxylated Ending‐Group Asymmetric Small Molecule Acceptor Lead Efficient Binary Organic Photovoltaic Blend

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 16, 2024

Abstract Developing a new end group for synthesizing asymmetric small molecule acceptors (SMAs) is crucial achieving high‐performance organic photovoltaics (OPVs). Herein, an acceptor, BTP‐BO‐4FO, featuring difluoro‐methoxylated end‐group reported. Compared to its symmetric counterpart L8‐BO, BTP‐BO‐4FO exhibits upshifted energy level, larger dipole moment, and more sequential crystallinity. By adopting two representative widely available solvent additives (1‐chloronaphthalene (CN) 1,8‐diiodooctane (DIO)), the device based on PM6:BTP‐BO‐4FO photovoltaic blend demonstrates power conversion efficiency (PCE) of 18.62% with excellent open‐circuit voltage ( V OC ) 0.933 V, which surpasses optimal result L8‐BO. The PCE realizes best efficiencies binary OPVs SMAs groups. A series investigations reveal that optimized film similar molecular packing motif fibrillar phase distribution as PM6:L8‐BO (DIO) does, resulting in comparable recombination dynamics, thus, fill factor. Besides, it found possesses efficient charge generation, yields better – J SC balance. This study provides ending enables cutting‐edge SMA‐based OPVs, enriching material library shed light further design ideas.

Язык: Английский

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High‐Performance Photoactive Polymers: Innovations in Ternary Polymerization for Solar Applications

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 2, 2025

Abstract In recent years, polymer solar cells (PSCs) have achieved rapid progress, with power conversion efficiencies (PCEs) reaching up to 20.25%, driven by significant advancements in device fabrication and active‐layer materials. The ternary polymerization strategy has proven be a straightforward effective approach for developing high‐performance photoelectric polymers incorporating third monomer into the backbone. This incorporation effectively optimizes intrinsic properties, including UV–vis absorption, energy levels, solubility, crystallinity, morphology, charge transfer, mechanical robustness, batch‐to‐batch reproducibility, stability. review highlights latest designing photoactive copolymers (both donors acceptors), particular focus on stability, potential applications commercial development. aim is provide valuable guidance development of materials using strategy.

Язык: Английский

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Preparation of Dual-Asymmetric Acceptors via Selenium Substitution Combined with Terminal Group Optimization Strategy for High Efficiency Organic Solar Cells

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

Опубликована: Фев. 25, 2025

Improving both the open-circuit voltage (VOC) and short-circuit current density (JSC) through development of photovoltaic materials to achieve high power conversion efficiency (PCE) is critical a significant challenge for organic solar cells (OSCs). Here, we designed novel dual-asymmetric acceptors A-SSe-TCF A-SSe-LSF by simultaneously asymmetrically regulating backbone terminal groups investigated their synergistic effects on performance in comparison with monoasymmetric acceptor A-SSe-4F. The exhibit broader spectral absorption larger half-molecule dipole moment differences, which favored enhancement JSC reduction energy loss (Eloss). Among binary blends, PM6:A-SSe-TCF exhibits superior phase separation, vertical distribution morphology, more ordered π-π stacking compared PM6:A-SSe-LSF PM6:A-SSe-4F. As result, OSCs based achieved higher PCE 18.53% VOC due suppressed nonradiative recombination enhanced charge extraction capabilities. Furthermore, incorporating as third component, PM6:L8-BO:A-SSe-TCF-based device achieves champion 19.73% without account decrement Eloss. strategy provides new insights into molecular design improvement OSCs.

Язык: Английский

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