AI Article Synopsis
- Three newly designed nonfused ring electron acceptors (NFREAs) include 3TT-C2-F, 3TT-C2-Cl, and 3TT-C2, utilizing halogenation to improve their molecular properties.
- The addition of fluorine and chlorine enhances π-π stacking, boosts electron mobility, and optimizes nanofiber structure, leading to better exciton dissociation and charge transport.
- Blend films using D18:3TT-C2-F show exceptional power conversion efficiency at 17.19%, outperforming the other two acceptors and marking a new high for NFREA-based devices in organic solar cells.
Article Abstract
Three nonfused ring electron acceptors (NFREAs), namely, 3TT-C2-F, 3TT-C2-Cl, and 3TT-C2, are purposefully designed and synthesized with the concept of halogenation. The incorporation of F or/and Cl atoms into the molecular structure (3TT-C2-F and 3TT-C2-Cl) enhances the π-π stacking, improves electron mobility, and regulates the nanofiber morphology of blend films, thus facilitating the exciton dissociation and charge transport. In particular, blend films based on D18:3TT-C2-F demonstrate a high charge mobility, an extended exciton diffusion distance, and a well-formed nanofiber network. These factors contribute to devices with a remarkable power conversion efficiency of 17.19%, surpassing that of 3TT-C2-Cl (16.17%) and 3TT-C2 (15.42%). To the best of knowledge, this represents the highest efficiency achieved in NFREA-based devices up to now. These results highlight the potential of halogenation in NFREAs as a promising approach to enhance the performance of organic solar cells.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/adma.202310362 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enantioselective Synthesis of Nonfused Eight-Membered O-Heterocycles by Sequential Catalysis.
Org Lett
January 2025
Catalytic Hydrogenation Research Center, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
This work describes a chiral bifunctional squaramide/DBU sequential catalytic strategy for the enantioselective synthesis of nonfused chiral eight-membered O-heterocycles through the asymmetric addition of ynones to β,γ-unsaturated α-ketoesters followed by the regio- and diastereoselective cyclization of the adduct intermediates. Mechanistic experiments revealed that an isomerization process should be involved in the ring formation step, and the origin of the high regioselectivity and diastereoselectivity has also been elucidated by the DFT calculations.
View Article and Find Full Text PDFSimple A-D-A Nonfullerene Acceptors for Efficient Binary Bulk Heterojunction Organic Solar Cells.
ACS Appl Mater Interfaces
January 2025
Département de chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.
Article Synopsis
- Two new nonfused ring electron acceptors were synthesized, showing a unique A-D-A (acceptor-donor-acceptor) structure and demonstrating significant absorption properties in the range of 540 nm to 700 nm.
- Their fluorescence occurs in the near-IR region, with lifetimes between 75-410 ps, and electrochemical measurements provide insights into their energy levels (HOMO and LUMO).
- The nonfused NFAs were incorporated into photovoltaic cells, achieving impressive power conversion efficiencies of 10.17% and 14.09%, indicating their potential for simpler applications in organic solar technology.
Emergence of Low-Cost and High-Performance Nonfused Ring Electron Acceptors.
Acc Chem Res
December 2024
College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China.
Article Synopsis
- Organic solar cells (OSCs) are lightweight and can be made semitransparent, making them appealing for various applications since the introduction of the bulk heterojunction concept in 1995.
- Fullerene derivatives were once the go-to electron acceptors for OSCs but have reached a power conversion efficiency (PCE) plateau of around 12% due to limitations like poor light absorption and energy level tunability.
- Nonfullerene electron acceptors (NFAs), particularly fused-ring electron acceptors (FREAs), have emerged as superior alternatives since 2015, achieving PCEs up to 20% but face challenges in complex and costly synthesis; nonfused ring electron acceptors (NFREAs
Terminal Fluorination Modulates Crystallinity and Aggregation of Fully Non-Fused Ring Electron Acceptors for High-Performance and Durable Near-Infrared Organic Photodetectors.
Angew Chem Int Ed Engl
November 2024
State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.
High dark current density (J) severely hinders further advancement of near-infrared organic photodetectors (NIR OPDs). Herein, we tackle this grand challenge by regulating molecular crystallinity and aggregation of fully non-fused ring electron acceptors (FNREAs). TBT-V-F, which features fluorinated terminals, notably demonstrates crystalline intensification and a higher prevalence predominance of J-aggregation compared to its chlorinated counterpart (TBT-V-Cl).
View Article and Find Full Text PDFFully Non-Fused Ring Electron Acceptors Enable Effective Additive-Free Organic Solar Cells with Enhanced Exciton Diffusion Length.
Small
December 2024
Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
Low-cost photovoltaic materials and additive-free, non-halogenated solvent processing of photoactive layers are crucial for the large-scale commercial application of organic solar cells (OSCs). However, high-efficiency OSCs that possess all these advantages remain scarce due to the lack of insight into the structure-property relationship. In this work, three fully non-fused ring electron acceptors (NFREAs), DTB21, DTB22, and DTB23, are reported by utilizing a simplified 1,4-di(thiophen-2-yl)benzene (DTB) core with varied alkoxy chain lengths on the thiophene bridge.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!