Selective halogenation of central and end-units of nonfullerene acceptors enables enhanced molecular packing and photovoltaic performance

Energy & Environmental Science, Год журнала: 2023, Номер 16(8), С. 3543 - 3551

Опубликована: Янв. 1, 2023

Qx- p -4Cl with both a para -fluorinated central unit and chlorinated end groups exhibits enhanced molecular packing, facilitating efficient charge transport, thus achieving power conversion efficiency (PCE) of 18.78% when blended donor PM6.

Язык: Английский

---

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Advanced Energy Materials, Год журнала: 2023, Номер 13(20)

Опубликована: Апрель 6, 2023

Abstract Developing efficient and stable all‐polymer solar cells (all‐PSCs) has received increasing attention because of their mechanical robustness for flexible devices. Based on the CH‐series small molecule acceptors, a new polymer acceptor (PZC24) is reported obtains decent power conversion efficiency (PCE) 16.82% when blended with PM6. To further improve performance, an oligomeric (CH‐D1), which possesses same backbone structure as PZC24, proposed synthesized third component all‐PSC system. The creative strategy improves crystallinity molecular packing, can maintain charge transport channels all‐PSCs binary Therefore, PM6:PZC24:CH‐D1 based ternary devices exhibit impressive PCE 17.40%, among highest value all‐PSCs. Compared to PM6:PZC24, device exhibits enhanced photosoaking stability thermal stability, simultaneously. In addition, introduction does not weaken As such, display excellent 15.35%. Importantly, this shows universality in PM6:PY‐IT PM6:PY‐V‐γ improved PCEs over 17%. results provide feasible simultaneously photovoltaic herald bright future

Язык: Английский

---

Molecular Packing and Dielectric Property Optimization through Peripheral Halogen Swapping Enables Binary Organic Solar Cells with an Efficiency of 18.77%

Advanced Functional Materials, Год журнала: 2023, Номер 33(31)

Опубликована: Апрель 17, 2023

Abstract Peripheral halogen regulations can endow non‐fullerene acceptors (NFAs) with enhanced features as organic semi‐conductors and further boost efficient solar cells (OSCs). Herein, based on a remarkable molecular platform of CH14 more than six halogenation positions, preferred NFA CH23 is constructed by synergetic swapping both central end units, rendering the overall enlarged dipole moment, packing density thus relative dielectric constant. Consequently, CH23‐based binary OSC reaches an excellent efficiency 18.77% due to its improved charge transfer/transport dynamics, much better that 17.81% for control CH14. This work demonstrates great potential achieving state‐of‐the‐art OSCs delicately regulating formula these newly explored CH‐series NFAs.

Язык: Английский

---

Terminally Chlorinated and Thiophene‐linked Acceptor‐Donor‐Acceptor Structured 3D Acceptors with Versatile Processability for High‐efficiency Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(38)

Опубликована: Авг. 7, 2023

Abstract To exploit the potential of our newly developed three‐dimensional (3D) dimerized acceptors, a series chlorinated 3D acceptors (namely CH8‐3/4/5) were reported by precisely tuning position chlorine (Cl) atom. The introduction Cl atom in central unit affects molecular conformation. Whereas, replacing fluorinated terminal groups (CH8‐3) with (CH8‐4 and CH8‐5), red‐shift absorption enhanced crystallization are achieved. Benefiting from these, all devices received promising power conversion efficiencies (PCEs) over 16 % as well decent thermal/photo‐stabilities. Among them, PM6:CH8‐4 based device yielded best PCE 17.58 %. Besides, merits multi alkyl chains enable their versatile processability during preparation. Impressive PCEs 17.27 16.23 could be achieved for non‐halogen solvent processable prepared glovebox ambient, respectively. 2.88 cm 2 modules also obtained 13 via spin‐coating blade‐coating methods, These results among performance acceptors. CH8‐4 on small‐area devices, solvent‐processed highlights processing capability applications future.

Язык: Английский

---

Strengthening the Hetero‐Molecular Interactions in Giant Dimeric Acceptors Enables Efficient Organic Solar Cells

Advanced Materials, Год журнала: 2023, Номер 36(4)

Опубликована: Ноя. 23, 2023

Abstract Giant dimeric acceptor (G‐Dimer) is becoming one of the most promising organic solar cell (OSC) materials because its definite structure, long‐term stability, and high efficiency. Strengthening hetero‐molecular interactions by monomer modification greatly influences morphology thus device performance, but lacks investigation. Herein, two novel quinoxaline core‐based G‐Dimers, Dimer‐QX Dimer‐2CF, are synthesized. By comparing trifluoromethyl‐substituted Dimer‐2CF non‐substituted Dimer‐QX, trifluoromethylation effect on G‐Dimer investigated revealed. The trifluoromethyl with strong electronegativity increases electrostatic potential reduces surface energy G‐Dimer, weakening homo‐molecular ordered packing reinforcing interaction donor. suppresses fast assembly during film formation, facilitating small domains molecular in blend, which a trade‐off conventional control. Together favorable vertical phase separation, efficient charge generation, reduced bimolecular recombination concurrently obtained. Hence, Dimer‐2CF‐based OSCs obtain cutting‐edge efficiency 19.02% fill factor surpassing 80%, an averaged extrapolated T 80 ≈12 000 h under continuous °C heating. This study emphasizes importance strategy, providing facile strategy for designing highly stable OSC materials.

Язык: Английский

---

Simple‐Structured Acceptor with Highly Interconnected Electron‐Transport Pathway Enables High‐Efficiency Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(23)

Опубликована: Фев. 19, 2024

Abstract Achieving desirable charge‐transport highway is of vital importance for high‐performance organic solar cells (OSCs). Here, it shown how molecular packing arrangements can be regulated via tuning the alkyl‐chain topology, thus resulting in a 3D network stacking and highly interconnected pathway electron transport simple‐structured nonfused‐ring acceptor (NFREA) with branched alkyl side‐chains. As result, record‐breaking power conversion efficiency 17.38% (certificated 16.59%) achieved NFREA‐based devices, providing an opportunity constructing low‐cost high‐efficiency OSCs.

Язык: Английский

---

The Development of Quinoxaline‐Based Electron Acceptors for High Performance Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(33)

Опубликована: Июнь 19, 2024

In the recent advances of organic solar cells (OSCs), quinoxaline (Qx)-based nonfullerene acceptors (QxNFAs) have attracted lots attention and enabled recorded power conversion efficiency approaching 20%. As an excellent electron-withdrawing unit, Qx possesses advantages many modifiable sites, wide absorption range, low reorganization energy, so on. To develop promising QxNFAs to further enhance photovoltaic performance OSCs, it is necessary systematically summarize reported far. this review, all focused are classified into five categories as following: SM-Qx, YQx, fused-YQx, giant-YQx, polymer-Qx according molecular skeletons. The design concepts, relationships between structure optoelectronic properties, intrinsic mechanisms device discussed in detail. At end, kind materials summed up, direction prospected, challenges faced by given, constructive solutions existing problems advised. Overall, review presents unique viewpoints conquer challenge thus boost OSCs development toward commercial applications.

Язык: Английский

---

Binary All‐polymer Solar Cells with a Perhalogenated‐Thiophene‐Based Solid Additive Surpass 18 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(9)

Опубликована: Янв. 3, 2024

Abstract Morphological control of all‐polymer blends is quintessential yet challenging in fabricating high‐performance organic solar cells. Recently, solid additives (SAs) have been approved to be capable tuning the morphology polymer: small‐molecule improving performance and stability devices. Herein, three perhalogenated thiophenes, which are 3,4‐dibromo‐2,5‐diiodothiophene (SA‐T1), 2,5‐dibromo‐3,4‐diiodothiophene (SA‐T2), 2,3‐dibromo‐4,5‐diiodothiophene (SA‐T3), were adopted as SAs optimize cells (APSCs). For blend PM6 PY‐IT, benefitting from intermolecular interactions between thiophenes polymers, molecular packing properties could finely regulated after introducing these SAs. In situ UV/Vis measurement revealed that assist morphological character evolution blend, leading their optimal morphologies. Compared as‐cast device : all SA‐treated binary devices displayed enhanced power conversion efficiencies 17.4–18.3 % with obviously elevated short‐circuit current densities fill factors. To our knowledge, PCE 18.3 for SA‐T1‐treated ranks highest among APSCs date. Meanwhile, universality SA‐T1 other demonstrated unanimously improved performance. This work provide a new pathway realizing APSCs.

Язык: Английский

---

A generic approach yields organic solar cells with enhanced efficiency and thermal stability

Aggregate, Год журнала: 2022, Номер 4(2)

Опубликована: Ноя. 5, 2022

Abstract The use of deuterium are critical for promoting the fundamental understanding aggregate materials and their new functions. Particularly, solution structure conjugated polymers can be hardly resolved without deuteration. However, studies about isotopic effects casting solvents on aggregated structures photovoltaic bulk‐heterojunction blends deficient. Here, impact deuterated thermal behavior, structures, device performance is clearly delineated first time by multiple techniques. enhanced π‐π stacking order highly relevant to relatively poor miscibility with solvents. Benefiting from higher crystallinity optimized morphology processed films, devices able achieve better efficiency notable improvement in stability. Our results highlight polymer systems reveal potential innovative approaches fabricate thermally stable high‐efficiency solar cells.

Язык: Английский

---

Exploring the significance of packing modes and 3D framework sizes and utilizing three chlorine-mediated acceptors and the “like dissolves like” approach for achieving an efficiency over 19%

Energy & Environmental Science, Год журнала: 2023, Номер 16(12), С. 5944 - 5955

Опубликована: Янв. 1, 2023

It revealed the packing arrangement of three representative chlorinated NFAs, showing differences from linear to compact 3D network structures, which suggests evolution direction NFA materials with gradually enhanced device performance.

Язык: Английский

---