Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(36)

Опубликована: Июль 18, 2023

Achieving both high open-circuit voltage (Voc ) and short-circuit current density (Jsc to boost power-conversion efficiency (PCE) is a major challenge for organic solar cells (OSCs), wherein energy loss (Eloss inefficient charge transfer usually take place. Here, three new Y-series acceptors of mono-asymmetric asy-YC11 dual-asymmetric bi-asy-YC9 bi-asy-YC12 are developed. They share the same asymmetric D1 AD2 (D1 =thieno[3,2-b]thiophene D2 =selenopheno[3,2-b]thiophene) fused-core but have different unidirectional sidechain on side, allowing fine-tuned molecular properties, such as intermolecular interaction, packing pattern, crystallinity. Among binary blends, PM6 : one has better morphology with appropriate phase separation higher order than asy-YC9 bi-asy-YC11 ones. Therefore, bi-asy-YC12-based OSCs offer PCE 17.16 % Voc Jsc , due reduced Eloss efficient properties. Inspired by strong NIR-absorption, introduced into L8-BO construct ternary OSCs. Thanks broadened absorption, optimized morphology, furtherly minimized achieve champion 19.23 %, which highest efficiencies among these annealing-free devices. Our developed engineering constructing bi-asymmetric provides an approach

Язык: Английский

---

Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2% Efficiency Ortho-Xylene Processed Organic Solar Cells

Nano-Micro Letters, Год журнала: 2023, Номер 16(1)

Опубликована: Ноя. 23, 2023

Abstract With plenty of popular and effective ternary organic solar cells (OSCs) construction strategies proposed applied, its power conversion efficiencies (PCEs) have come to a new level over 19% in single-junction devices. However, previous studies are heavily based chloroform (CF) leaving behind substantial knowledge deficiencies understanding the influence solvent choice when introducing third component. Herein, we present case where newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy, named BTP-BO-3FO with enlarged bandgap, brings different morphological evolution performance improvement effect on host system PM6:BTP-eC9, processed by CF ortho-xylene ( o -XY). detailed analyses supported series experiments, best PCE 19.24% for green solvent-processed OSCs is found be fruit finely tuned crystalline ordering general aggregation motif, which furthermore nourishes favorable charge generation recombination behavior. Likewise, can achieved replacing spin-coating blade coating active layer deposition. This work focuses commonly met yet frequently ignored issues building blends demonstrate cutting-edge device performance, hence, will instructive other OSC works future.

Язык: Английский

---

Cyano-functionalized pyrazine: an electron-deficient unit as a solid additive enables binary organic solar cells with 19.67% efficiency

Energy & Environmental Science, Год журнала: 2024, Номер 17(10), С. 3365 - 3374

Опубликована: Янв. 1, 2024

A strong electron-deficient unit CNPz as a solid additive was developed in PTQ10/ m -BTP-PhC6 binary organic solar cells. high PCE of 19.67% achieved with significant increase the J SC and FF (81.8%).

Язык: Английский

---

Defining Solid Additive's Pivotal Role on Morphology Regulation in Organic Solar Cells Produced by Layer‐by‐layer Deposition

Advanced Energy Materials, Год журнала: 2024, Номер 14(22)

Опубликована: Март 8, 2024

Abstract Herein, two emerging device optimization methods, solid additive and layer‐by‐layer (LBL) process, for organic solar cells (OSCs) are simultaneously studied. Through traditional blend cast recently proposed identical solvent LBL cast, BDCB (2‐monobromo‐1,3‐dichloro‐bezene), a benzene derivative, is used to improve the performance based on celebrity combination PM6:L8‐BO. The results reveal that finely optimized concentration in PM6 solution can push efficiency of 19.03% compared with only 18.12% while power conversion (PCE) changing trend determined by BDCB's ratio L8‐BO's precursor. morphology characterizations confirm there exists no significant stratification LBL‐processed devices, supported previously reported swelling‐intercalation‐phase separation (SIPS) model. Thereby, additive's 2D considered smart strategy tuning SIPS which various final states. This work not reports cutting‐edge binary OSCs, but also new insight deep understanding method‐based development.

Язык: Английский

---

Isomerization of Benzothiadiazole Yields a Promising Polymer Donor and Organic Solar Cells with Efficiency of 19.0%

Advanced Materials, Год журнала: 2024, Номер 36(19)

Опубликована: Фев. 2, 2024

The exploration of high-performance and low-cost wide-bandgap polymer donors remains critical to achieve high-efficiency nonfullerene organic solar cells (OSCs) beyond current thresholds. Herein, the 1,2,3-benzothiadiazole (iBT), which is an isomer 2,1,3-benzothiadiazole (BT), used design donor PiBT. PiBT-based reach efficiency 19.0%, one highest efficiencies in binary OSCs. Systemic studies show that isomerization BT iBT can finely regulate polymers' photoelectric properties including i) increasing extinction coefficient photon harvest, ii) downshifting occupied molecular orbital energy levels, iii) improving coplanarity backbones, iv) offering good thermodynamic miscibility with acceptors. Consequently, PiBT:Y6 bulk heterojunction (BHJ) device simultaneously reaches advantageous nanoscale morphology, efficient exciton generation dissociation, fast charge transportation, suppressed recombination, leading larger VOC 0.87 V, higher JSC 28.2 mA cm-2, greater fill factor 77.3%, thus while analog-PBT-based OSCs only 12.9%. Moreover, key intermediate be easily afforded from industry chemicals via two-step procedure. Overall, this contribution highlights a promising motif for designing donors.

Язык: Английский

---

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

---

Oligomeric semiconductors enable high efficiency open air processed organic solar cells by modulating pre-aggregation and crystallization kinetics

Energy & Environmental Science, Год журнала: 2023, Номер 16(12), С. 6078 - 6093

Опубликована: Янв. 1, 2023

Two novel oligomers boost the 1 cm 2 device to achieve a remarkable PCE exceeding 17% using green solvent in open-air without post-treatment. In-depth situ & ex studies elucidate mechanisms of action oligomers. This work demonstrates effective guidelines for future manufacturing.

Язык: Английский

---

3D Crystal Framework Regulation Enables Se‐Functionalized Small Molecule Acceptors Achieve Over 19% Efficiency

Advanced Energy Materials, Год журнала: 2024, Номер 14(19)

Опубликована: Март 10, 2024

Abstract Se‐functionalized small molecule acceptors (SMAs) exhibit unique advantages in constructing materials with near‐infrared absorption, but their photovoltaic performance lags behind that of S‐containing analogs organic solar cells (OSCs). Herein, two new Se‐containing SMAs, namely Se‐EH and Se‐EHp, are designed synthesized by regulating bifurcation site outer alkyl chain, which enables Se‐EHp to form different 3D crystal frameworks from CH1007. displays tighter π–π stacking denser packing framework smaller‐sized pore structure induced larger steric hindrance effect chain branched at 2‐position, a higher dielectric constant PM6:Se‐EH active layer can be obtained. OSCs based on achieved very high PCEs 18.58% binary 19.03% ternary devices FF approaching 80% for SMAs. A more significant adjusts the molecular crystallization favorable nanofiber interpenetrating network an appropriate domain size reduce rate sub‐ns recombination promote balanced transport carriers. This work provides references further design development highly efficient

Язык: Английский

---

19% efficiency in organic solar cells of Benzo[1,2-b:4,5-b′]Difuran-based donor polymer realized by volatile + non-volatile dual-solid-additive strategy

Materials Science and Engineering R Reports, Год журнала: 2024, Номер 159, С. 100794 - 100794

Опубликована: Апрель 13, 2024

Язык: Английский

---

Correlating Aggregation Ability of Polymer Donors with Film Formation Kinetics for Organic Solar Cells with Improved Efficiency and Processability

Advanced Materials, Год журнала: 2024, Номер 36(29)

Опубликована: Май 4, 2024

Film formation kinetics significantly impact molecular processability and power conversion efficiency (PCE) of organic solar cells. Here, two ternary random copolymerization polymers are reported, D18─N-p D18─N-m, to modulate the aggregation ability D18 by introducing trifluoromethyl-substituted pyridine unit at para- meta-positions, respectively. The introduction reduces material adjusts interactions with acceptor L8-BO, thereby leading largely changed film earlier phase separation longer times, which enlarge fiber sizes in blend films improve carrier generation transport. As a result, moderate delivers high PCE 18.82% is further improved 19.45% via interface engineering. Despite slightly inferior small area device performances, D18─N-m shows solubility, inspires adjust ratio meta-trifluoromethyl carefully obtain polymer donor D18─N-m-10 good solubility nonhalogenated solvent o-xylene. High PCEs 13.07% 12.43% 1 cm

Язык: Английский

---