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

Haotian Hu,

Jinfeng Ge, Zhenyu Chen

et al.

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(17)

Published: Feb. 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.

Language: Английский

Isomerization strategy on a non-fullerene guest acceptor for stable organic solar cells with over 19% efficiency DOI
Zhenyu Chen, Jintao Zhu, Daobin Yang

et al.

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(7), P. 3119 - 3127

Published: Jan. 1, 2023

Isomeric non-fullerene acceptor guest with large π-conjugation skeleton is used to construct stable organic solar cells efficiencies over 19%.

Language: Английский

Citations

170
Benzo[d]thiazole Based Wide Bandgap Donor Polymers Enable 19.54% Efficiency Organic Solar Cells Along with Desirable Batch‐to‐Batch Reproducibility and General Applicability DOI
Bo Pang,

Chentong Liao,

Xiaopeng Xu

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 4, 2023

Abstract The limited selection pool of high‐performance wide bandgap (WBG) polymer donors is a bottleneck problem the nonfullerene acceptor (NFA) based organic solar cells (OSCs) that impedes further improvement their photovoltaic performances. Herein, series new WBG polymers, namely PH‐BTz, PS‐BTz, PF‐BTz, and PCl‐BTz, are developed by using bicyclic difluoro‐benzo[d]thiazole (BTz) as block benzo[1,2‐b:4,5‐b′]dithiophene (BDT) derivatives donor units. By introducing S, F, Cl atoms to alkylthienyl sidechains on BDT, resulting polymers exhibit lowered energy levels enhanced aggregation properties. fluorinated PBTz‐F not only exhibits low‐lying HOMO level, but also has stronger face‐on packing order results in more uniform fibril‐like interpenetrating networks related PF‐BTz:L8‐BO blend. A high‐power conversion efficiency (PCE) 18.57% achieved. Moreover, good batch‐to‐batch reproducibility general applicability. In addition, ternary blend OSCs host PBTz‐F:L8‐BO PM6 guest PCE 19.54%, which among highest values OSCs.

Language: Английский

Citations

159
Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer DOI
Qunping Fan, Ruijie Ma, Jie Yang

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 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

Language: Английский

Citations

72
Halogenated Nonfused Ring Electron Acceptor for Organic Solar Cells with a Record Efficiency of over 17% DOI

Dawei Li,

Huarui Zhang, Xinyue Cui

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Nov. 23, 2023

Abstract Three nonfused ring electron acceptors (NFREAs), namely, 3TT‐C2‐F , 3TT‐C2‐Cl and 3TT‐C2 are purposefully designed synthesized with the concept of halogenation. The incorporation F or/and Cl atoms into molecular structure ( ) enhances π–π stacking, improves mobility, regulates nanofiber morphology blend films, thus facilitating exciton dissociation charge transport. In particular, films based on D18: demonstrate a high an extended diffusion distance, well‐formed network. These factors contribute to devices remarkable power conversion efficiency 17.19%, surpassing that (16.17%) (15.42%). To best knowledge, this represents highest achieved in NFREA‐based up now. results highlight potential halogenation NFREAs as promising approach enhance performance organic solar cells.

Language: Английский

Citations

65
Constructing Multiscale Fibrous Morphology to Achieve 20% Efficiency Organic Solar Cells by Mixing High and Low Molecular Weight D18 DOI Open Access
Nan Wei,

Jieni Chen,

Yetai Cheng

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)

Published: Sept. 1, 2024

This study underscores the significance of precisely manipulating morphology active layer in organic solar cells (OSCs). By blending polymer donors D18 with varying molecular weights, a multiscale interpenetrating fiber network structure within is successfully created. The introduction 10% low weight (LW-D18) into high (HW-D18) produces MIX-D18, which exhibits an extended exciton diffusion distance and orderly stacking. Devices utilizing MIX-D18 demonstrate superior electron hole transport, improves dissociation, enhances charge collection efficiency, reduces trap-assisted recombination compared to other two materials. Through use nonfullerene acceptor L8-BO, remarkable power conversion efficiency (PCE) 20.0% achieved. methodology, integrates favorable attributes polymers, opens new avenue for enhancing performance OSCs.

Language: Английский

Citations

56
Dual Function of the Third Component in Ternary Organic Solar Cells: Broaden the Spectrum and Optimize the Morphology DOI
Jiangang Liu, Xingpeng Liu, Jingming Xin

et al.

Small, Journal Year: 2024, Volume and Issue: 20(24)

Published: Jan. 29, 2024

Abstract Ternary organic solar cells (T‐OSCs) have attracted significant attention as high‐performance devices. In recent years, T‐OSCs achieved remarkable progress with power conversion efficiency (PCE) exceeding 19%. However, the introduction of third component complicates intermolecular interaction compared to binary blend, resulting in poor controllability active layer and limiting performance improvement. To address these issues, dual‐functional components been developed that not only broaden spectral range but also optimize morphology. this review, effect on expanding absorption is first discussed. Second, extra functions are introduced, including adjusting crystallinity molecular stack layer, regulating phase separation purity, altering orientation donor or acceptor. Finally, a summary current research provided, followed by discussion future directions.

Language: Английский

Citations

33
High-Efficiency Ternary Polymer Solar Cells with a Gradient-Blended Structure Fabricated by Sequential Deposition DOI
Jianghao Jin, Qiao Wang, Wenfei Shen

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(12), P. 15121 - 15132

Published: March 19, 2024

Acquiring the ideal blend morphology of active layer to optimize charge separation and collection is a constant goal polymer solar cells (PSCs). In this paper, ternary strategy sequential deposition process were combined make sufficient use spectrum, energy-level structure, regulate vertical phase morphology, ultimately enhance power conversion efficiency (PCE) stability PSCs. Specifically, donor acceptor illustrated gradient-blended distribution in deposition-processed films, thus resulting facilitated carrier characteristics devices. Consequently, PSCs based on D18-Cl/Y6:ZY-4Cl have achieved device over 18% with synergetic improvement open-circuit voltage (VOC), short-circuit current density (JSC), fill factor (FF). Therefore, work reveals facile approach fabricating improved performance stability.

Language: Английский

Citations

21
Insight Into Designing High‐Performance Polythiophenes for Reduced Urbach Energy and Nonradiative Recombination in Organic Solar Cells DOI
Zhe Sun,

Hayoung Ma,

Sangjin Yang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: April 18, 2024

Abstract In the pursuit of high‐efficiency polythiophene (PT) organic solar cells (OSCs), a critical challenge is reduction nonradiative recombination. This study comprehensively explores polydithienylthiazolothiazole (PTTz)‐based PT terpolymers: PTTz‐Tz and PTTz‐TzT, in which it demonstrate that molecular structure alterations greatly influence aggregation kinetics orientation these polymers. Specifically, PTTz‐TzT achieves rapid ordering during spin coating, effectively suppressing excessive polymer facilitating appropriate phase separation upon mixing with acceptor. Meanwhile, inherently adopts face‐on orientation, resulting more structured π–π stacking vertical direction after acceptor integration, compared to intrinsic edge‐on PTTz‐Tz. These factors collectively contribute lower Urbach energy substantial recombination PTTz‐TzT‐based OSCs, culminating high photovoltaic conversion efficiency (PCE) exceeding 16%. Furthermore, prominent PCE 19.11% obtained by via ternary blend strategy, among highest values reported for OSCs. investigation underscores significance PT‐based polymers, especially regarding recombination, offers novel insights designing high‐performance donors.

Language: Английский

Citations

21
Achieving 19.78%‐Efficiency Organic Solar Cells by 2D/1A Ternary Blend Strategy with Reduced Non‐Radiative Energy Loss DOI
Xiaolin Jiang, Xiaodong Wang, Yifan Wang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: June 2, 2024

Abstract Reducing non‐radiative energy loss (∆ E nr ) is critical for enhancing the photovoltaic performance of organic solar cells (OSCs). To achieve this, a small molecular donor, LJ1, introduced as third component in host system D: A (D18: BTP‐eC9‐4F). The cascade‐like level alignment D18, and BTP‐eC9‐4F facilitates efficient charge transfer. LJ1's good solubility processing solvent high miscibility with delay precipitation BTP‐eC9‐4F, leading to improved phase morphology blend films. Additionally, LJ1 increases spacing between polymer donor (PD) molecule acceptor (SMA), optimizing film reducing OSCs. Ternary OSCs based on D18:LJ1:BTP‐eC9‐4F power conversion efficiency (PCE) 19.43% reduced ∆ . Notably, ternary device using D18:LJ1:L8‐BO attains an outstanding PCE 19.78%, which one highest OSC. work highlights effectiveness strategy OSC while minimizing

Language: Английский

Citations

20
Non-fullerene acceptors with high crystallinity and photoluminescence quantum yield enable >20% efficiency organic solar cells DOI
Chao Li,

Jiali Song,

Hanjian Lai

et al.

Nature Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Language: Английский

Citations

13