Theoretical Insight into Fluorination on Low‐Cost A‐π‐D‐π‐A Type Donor Materials for All‐Small‐Molecule Organic Photovoltaic Cells DOI

Jia‐Qian Nong,

Jin‐Hong Han,

Pan Jian

et al.

ChemPhotoChem, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

Abstract Low‐cost organic photovoltaic (OPV) devices have shown enormous potential in large‐scale industrial applications. And it has attracted widespread attention the past few decades. However, photophysical characteristics of these budget‐friendly materials haven't been explored much. Here, low‐cost small materials, including molecule 1 ( asm1 ) with ortho‐fluorinated side chain and 2 asm2 meta‐fluorinated were selected to probe fluorination effect on absorption spectra, electrochemical energy levels, electrostatic (ESP), etc. The results show that molecules good planarity backbone. contributes more highest occupied molecular orbital less lowest unoccupied than . Moreover, differences ESP are found between donor acceptor materials. Furthermore, strong broad light visible region is observed, resulting a better short‐circuit current density for constructed by donors , Y6 In addition, charge transfer mechanisms characterized asm1/Y6 system. introduction ortho‐fluorination conjugated favorable approach, which will provide theoretical guidance further design experiments.

Language: Английский

Extending Exciton Diffusion Length via an Organic‐Metal Platinum Complex Additive for High‐Performance Thick‐Film Organic Solar Cells DOI Open Access

Wentao Zou,

Yanna Sun, Lei Sun

et al.

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

Published: Jan. 6, 2025

The long exciton diffusion length (LD) plays an important role in promoting dissociation, suppressing charge recombination, and improving the transport process, thereby performance of organic solar cells (OSCs), especially thick-film OSCs. However, limited LD hinders further improvement device as film thickness increases. Here, organic-metal platinum complex, namely TTz-Pt, is synthesized served a solid additive into D18-Cl:L8-BO system. addition TTz-Pt enhanced crystallinity blends, reduced energy disorder, trap density, decreased non-radiative recombination binding energy, which conducive to prolonging TTz-Pt-treated film, facilitating dissociation process along with inhibiting recombination. Consequently, D18:L8-BO:IDIC (100 nm) exhibits champion power conversion efficiency (PCE) 20.12% (certified 19.54%), one highest PCEs reported for OSCs date. Remarkably, record-breaking PCE 18.84% yielded active layer 300 nm. Furthermore, superior universality This work provides simple universal approach extending by introducing complex achieve highly efficient

Language: Английский

Citations

5
In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells DOI Creative Commons
Ruijie Ma, Hongxiang Li, Top Archie Dela Peña

et al.

National Science Review, Journal Year: 2024, Volume and Issue: 11(12)

Published: Nov. 4, 2024

ABSTRACT Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells (all-PSCs), a promising photovoltaic technology towards multi-scenario application. Although the nano-fibrillar network of active layer induced by treatment is confirmed as key factor power conversion efficiency (PCE) all-PSCs, its formation mechanism not clearly revealed, lack precise and convincing real-time observation crystallization phase separation during liquid-to-solid transition process spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering (GIWAXS/GISAXS) screening that reveals fact naphthalene derived solid additives can suppress aggregation polymer acceptor (PY-IT) at beginning stage spin coating, which provides sufficient time space donor (PM6) to form fibril structure. Moreover, guided this knowledge, ternary system proposed, achieves cutting-edge level PCEs both small-area (0.04 cm2) (also decent operational stability) large-area (1 devices.

Language: Английский

Citations

10
Discerning Blend Microstructure and Charge Recombination for Stable Biorenewable‐Based Organic Photovoltaics DOI Creative Commons
Eva Mazzolini, Zhuoran Qiao, Jolanda Simone Müller

et al.

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Abstract The power conversion efficiency of organic photovoltaics (OPV) has recently surpassed 20%. However, the degradation mechanisms affecting blends based on these materials require urgent attention to improve stability such devices towards long timescales necessary for commercialization. In this work, we evaluated OPVs sustainable and scalable donors poly[(thiophene)‐alt‐(6,7‐difluoro‐2‐(2‐hexyldecyloxy)quinoxaline)] (PTQ10) poly[(5‐fluoro‐6‐((2‐hexyldecyl)oxy)benzo[c][1,2,5]thiadiazole)‐alt‐thiophene] (FO6‐T) blended with Y‐family NFAs different side‐chain lengths processed from biorenewable 2MeTHF PTQ10:Y12 FO6‐T:Y12 chloroform FO6‐T:Y6 blends. Superior is observed an extrapolated T80 over 2000 h under LED illumination, a more stable trend metal halide lamps illumination compared other By analyzing thin film microstructure using Atomic Force Microscope (AFM), significant phase separation in Y6‐based blend, FO6‐T:Y12, clear red‐shift UV–vis profile. superior blend attributed less morphological upon aging increased number photogenerated charges degradation. Finally, through series light intensity temperature‐dependent J–V characterizations, recombination mechanisms.

Language: Английский

Citations

2
Achieving Finely Optimized Morphology and Highly Efficient Layer-by-Layer Organic Solar Cells via Fluorinated Quinoxaline-Based Polymer Additives DOI
Yujie Wu,

Xingjian Dai,

Chentong Liao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Vertical phase-separated active layer morphology is essential for organic solar cells (OSCs), which can be effectively achieved through layer-by-layer (LbL) processing, enabling independent optimization of donor and acceptor layers. Here, we present a novel strategy to optimize the D18/L8-BO-based OSCs by incorporating polyfluoroquinoxaline-type polymer additives. Three quinoxaline-based polymers with varying fluorination contents, namely, P2FQx, P3FQx, P4FQx, were synthesized evaluated. Although these showed limited performance as standalone materials in bulk heterojunction (BHJ) devices, their use additives LbL-OSCs significantly enhanced device efficiency. These promoted D18 aggregation, L8-BO penetration, facilitated formation vertically interpenetrating donor/acceptor network. Among additives, P2FQx demonstrated best performance, an optimized achieving champion power conversion efficiency (PCE) 20.13% well high fill factor (FF) 80.13%. Our results highlight potential rationally designed address morphology-related challenges provide pathway further development high-performance scalable photovoltaic devices.

Language: Английский

Citations

2
Chlorinated Bithiophene Imide‐Based n‐Type Polymers: Synthesis, Structure–Property Correlations, and Applications in Organic Electronic Devices DOI Open Access

Suxiang Ma,

Henan Li,

Wenchang Wu

et al.

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Abstract Developing electron‐deficient (hetero)arenes with optimized geometries and electronic properties is imperative for advancing n ‐type polymers organic devices. We report here the design synthesis of two chlorinated imide‐functionalized heteroarenes, namely chlorine‐substituted bithiophene imide (ClBTI) its fused dimer (ClBTI2). The corresponding show a near‐planar framework, appropriate frontier molecular orbital levels, good solubility. When integrated into thin‐film transistors, ClBTI2‐based n‐type polymer afforded unipolar electron mobility up to 0.48 cm 2 V −1 s . binary all‐PSCs based on PM6 new power conversion efficiency (PCE) exceeding 1%. Interestingly, by introducing these ordered structure, high crystallinity, sizable as third component host system PM6:PY‐IT, continuous interpenetrating networks large fibrillar structures can be formed. Investigations charge transfer kinetics energy loss analyses unveiled that P(ClBTI2‐BTI) enables transport, reduced recombination, minimized non‐radiative within all‐polymer ternary blends, yielding remarkable PCE 19.35% (certified: 19.20%) through optimizing state‐of‐the‐art PM6:PY‐IT blend. structure–property–performance relationships provide valuable insights polymers, marking great progress in development high‐performance

Language: Английский

Citations

1
Triplet State Suppression for Energy Loss Reduction in 20% Nonhalogenated Solvent Processed Binary Organic Solar Cells DOI Creative Commons
Ruijie Ma, Bosen Zou, Yulong Hai

et al.

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

Published: March 16, 2025

Abstract Boosting power conversion efficiency (PCE) of organic solar cells (OSCs) has been restricted by its undesirably high energy loss, especially for those nonhalogenated solvent‐processed ones. Here,a dichloro‐methoxylated terminal group in an asymmetric small molecular acceptor design, which realizes a significantly reduced non‐radiative loss (0.179 eV) compared to symmetric counterpart (0.202 eV), is reported. Consequently, the device improved up 20% PM6:BTP‐eC9‐4ClO, without sacrificing photon harvest or charge transport ability control system PM6:BTP‐eC9. Further characterizations reveal BTP‐eC9‐4ClO's blend film demonstrates suppressed triplet state formation, enabled enhanced electron delocalization. In addition, BTP‐eC9‐4ClO found be thermally stabler than BTP‐eC9, and thus providing stability, whose T80 value reaches > 7800 h under 80 °C anneal N 2 via linear extrapolation. This work represents state‐of‐the‐art performance binary OSCs with certified results (19.45%).

Language: Английский

Citations

1
17.2% Efficiency for Completely Non‐Fused Acceptor Organic Solar Cells Via Re‐Intermixing Strategy in D/A Stratified Active Layer DOI Creative Commons

Xiyun Xie,

Ruijie Ma, Sen Zhang

et al.

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

Published: Sept. 9, 2024

Abstract Pursuing power conversion efficiency (PCE) is the priority of developing organic solar cells (OSCs) based on low‐cost completely non‐fused ring acceptors. Herein, a donor/acceptor re‐intermixing strategy to enhance photon capturing process, previously established well‐stratified active layer morphology reported. By adding 20 wt% PTQ10 (polymer donor) into acceptor's precursor, device PCE increased 16.03% from 15.11% D18/A4T‐16 control system, which attributed additional charge generation interface and suppressed bimolecular recombination. On contrary, using equal ratio PM6 leads significant loss, indicating importance considering vertical distribution perspective thermodynamics. Moreover, cutting‐edge level 17.21% for acceptor systems realized by altering PBQx‐TF/TBT‐26 PTQ11, via identical processing strategy. This work thus presents attractive engineering cell performance, as well in‐depth understanding.

Language: Английский

Citations

3
Chlorinated Bithiophene Imide‐Based n‐Type Polymers: Synthesis, Structure–Property Correlations, and Applications in Organic Electronic Devices DOI Open Access

Suxiang Ma,

Henan Li,

Wenchang Wu

et al.

Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Abstract Developing electron‐deficient (hetero)arenes with optimized geometries and electronic properties is imperative for advancing n ‐type polymers organic devices. We report here the design synthesis of two chlorinated imide‐functionalized heteroarenes, namely chlorine‐substituted bithiophene imide (ClBTI) its fused dimer (ClBTI2). The corresponding show a near‐planar framework, appropriate frontier molecular orbital levels, good solubility. When integrated into thin‐film transistors, ClBTI2‐based n‐type polymer afforded unipolar electron mobility up to 0.48 cm 2 V −1 s . binary all‐PSCs based on PM6 new power conversion efficiency (PCE) exceeding 1%. Interestingly, by introducing these ordered structure, high crystallinity, sizable as third component host system PM6:PY‐IT, continuous interpenetrating networks large fibrillar structures can be formed. Investigations charge transfer kinetics energy loss analyses unveiled that P(ClBTI2‐BTI) enables transport, reduced recombination, minimized non‐radiative within all‐polymer ternary blends, yielding remarkable PCE 19.35% (certified: 19.20%) through optimizing state‐of‐the‐art PM6:PY‐IT blend. structure–property–performance relationships provide valuable insights polymers, marking great progress in development high‐performance

Language: Английский

Citations

0
Stability of Organic Photovoltaics: From Root Causes to Advanced Analytical Techniques DOI Creative Commons
Yelim Choi, Dohyun Kim, Seung Un Ryu

et al.

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 10, 2025

Abstract The primary challenge in the commercialization of organic photovoltaics (OPVs) is ensuring long‐term stability, making study their degradation mechanisms essential. This centered on underlying degradation, providing a systematic and in‐depth analysis instability factors. A clear distinction between burn‐in loss established, with comprehensive examination governing each process. review highlights how pathways vary depending external environmental factors specific device layers, while also identifying key indicators for mitigating instability. Furthermore, this work extensively discusses analytical tools employed stability research, offering structured overview methodologies, obtained results, practical implications. Advanced high potential future applications are introduced, along principles prospective contributions to analysis. By integrating mechanistic perspective an exploration techniques, provides framework understanding OPV offers valuable insights into development effective stabilization strategies.

Language: Английский

Citations

0
Non‐Halogenated Solvent Processed Ternary All‐Polymer Solar Cell with PCE of 18.55% Enabled by Two Compatible Polymer Acceptors† DOI Creative Commons

Rouren Chen,

Tianyi Zhang,

Qiqing Ruan

et al.

Chinese Journal of Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 29, 2025

Comprehensive Summary Herein, a theory‐guided ternary construction case on boosting power conversion efficiency (PCE) for all‐polymer solar cell (all‐PSC) is reported, where guest acceptor's characteristics include high miscibility with host polymer acceptor, significantly larger optical bandgap, and improved luminescence. Consequently, only 10 wt% PFFO‐Th (third component) addition, the PCE of binary control promoted to 18.55% from 16.69%, 11.1% relative increase, demonstrating great effectiveness this strategy. Besides, realized at state‐of‐the‐art level all‐PSCs processed by ortho ‐xylene, widely acknowledged green non‐ halogenated solvent field. This study shares new thought designing high‐performance photovoltaic devices reduced energy losses favorable charge dynamics, which would nourish future development all‐PSCs, even other organic electronics.

Language: Английский

Citations

0