Polymer Donor with a Simple Skeleton and Minor Siloxane Decoration Enables 19% Efficiency of Organic Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(16)

Published: Jan. 18, 2024

Abstract Development of polymer donors with simple chemical structure and low cost is great importance for commercial application organic solar cells (OSCs). Here, side‐chain random copolymer PMQ‐Si605 a simply 6,7‐difluoro‐3‐methylquinoxaline‐thiophene backbone 5% siloxane decoration side chain synthesized in comparison its alternating PTQ11. Relative to molecular weight ( M n ) 28.3 kg mol −1 PTQ11, the minor beneficial achieving higher up 51.1 . In addition, can show stronger aggregation ability faster charge mobility as well more efficient exciton dissociation active layer revealed by femtosecond transient absorption spectroscopy. With L8‐BO‐F acceptor, based OSCs display power conversion efficiency (PCE) 18.08%, much than 16.21% PTQ11 devices. another acceptor BTP‐H2 optimize photovoltaic performance PMQ‐Si605, further elevated PCEs 18.50% 19.15% be achieved binary ternary OSCs, respectively. Furthermore, layers are suitable processing high humidity air, an important factor massive production OSCs. Therefore, on promising, affording high‐performing candidate.

Language: Английский

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Understanding photochemical degradation mechanisms in photoactive layer materials for organic solar cells

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(14), P. 7426 - 7454

Published: Jan. 1, 2024

Over the past decades, field of organic solar cells (OSCs) has witnessed a significant evolution in materials chemistry, which resulted remarkable enhancement device performance, achieving efficiencies over 19%. The photoactive layer OSCs play crucial role light absorption, charge generation, transport and stability. To facilitate scale-up OSCs, it is imperative to address photostability these electron acceptor donor materials, as their photochemical degradation process remains challenge during photo-to-electric conversion. In this review, we present an overview development emphasizing aspects chemical stability behavior that are linked OSCs. Throughout each section, highlight pathways for link degradation. We also discuss existing interdisciplinary challenges obstacles impede photostable materials. Finally, offer insights into strategies aimed at enhancing future directions developing photo-active layers, facilitating commercialization

Language: Английский

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Revealing the Effect of Halogenation Strategy on the Regulation of Crystallization Kinetics and Molecular Packing for High‐Performance Organic Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(12)

Published: Dec. 8, 2023

Abstract Halogenation of non‐fused ring electron acceptors (NFREAs) plays an important role in regulating their optoelectronic properties. However, the underlying mechanisms and impact on performance organic solar cells (OSCs) have remained unclear. Herein, a series halogenated NFREAs incorporating F, Cl, Br, are prepared to study effect crystallization kinetics, phase separation, molecular packing, charge transport. Among various halogenation strategies, chlorination minimizes Coulomb attractive energy between donor acceptor, thereby facilitating exciton dissociation. In situ UV–vis absorption tests reveal that chlorinated exhibit longer time, effectively suppressing excessive aggregation enhancing overall crystallinity. Additionally, diffusion length, which promotes dissociation while mitigating recombination devices. Consequently, two NFREAs, TCN‐Cl, PCN‐Cl, yield impressive power conversion efficiency (PCE) 14.85% 15.30%, respectively, when blended with PM6 J52 donors. These values represent highest reported PCEs date for A‐π‐A’‐π‐A A‐π‐D‐π‐A structures. The elucidates crucial extending length time. effects significantly benefit separation within active layers, enhance suppress achieving high‐efficiency OSCs.

Language: Английский

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Tert-butyl carbazole modified non-fused ring electron acceptor generating high triplet state energy level for efficient organic solar cell

Nano Energy, Journal Year: 2024, Volume and Issue: 125, P. 109583 - 109583

Published: April 4, 2024

Language: Английский

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Structural modification of A-C-A configured X–PCIC acceptor molecule for efficient photovoltaic properties with low energy loss in organic solar cells

Journal of Molecular Graphics and Modelling, Journal Year: 2024, Volume and Issue: 129, P. 108722 - 108722

Published: Feb. 7, 2024

Language: Английский

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Use of benzothiophene ring to improve the photovoltaic efficacy of cyanopyridinone-based organic chromophores: a DFT study

RSC Advances, Journal Year: 2024, Volume and Issue: 14(18), P. 12841 - 12852

Published: Jan. 1, 2024

The benzothiophene based chromophores (A1D1-A1D5) with A-π-A configuration were designed via end-capped tailoring type acceptors using reference compound (A1R). Quantum chemical calculations accomplished at M06/6-311G(d,p) level to probe optoelectronic and photophysical properties of chromophores. Therefore, frontier molecular orbitals (FMOs), binding energy (Eb), open circuit voltage (Voc), transition density matrix (TDM), state (DOS) UV-Vis analyses A1R A1D1-A1D5 accomplished. compounds exhibited absorption values in the visible region as 616.316-649.676 nm 639.753-665.508 gas chloroform phase, respectively, comparing chromophore. An efficient charge transference from HOMO towards LUMO was found which further supported by TDM DOS analyses. Among all chromophores, A1D2 unique characteristics such reduced band gap (2.354 eV), higher softness (σ = 0.424 lower exciton (0.491 eV) maximum value (Voc 1.981 V). Consequently, may be considered potential candidate for development devices. These revealed that studied promising findings. They utilized realm organic solar cells.

Language: Английский

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Thickness Insensitive Organic Solar Cells with High Figure‐of‐Merit‐X Enabled by Simultaneous D/A Interpenetration and Stratification

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(35)

Published: June 14, 2024

Abstract Low cost and printing friendly fabrication of organic solar cells (OSCs) require thick‐film devices with simply structured photoactive molecules. Thus, achieving high power conversion efficiency (PCE) for non‐fused ring acceptor‐based thickness is great significance. Herein, by transforming traditional blend casting method to emerging sequential deposition (SD) method, D18:A4T‐16 active exhibits large improvement from 8.02% 14.75% in 300 nm thick devices. Systematic morphological photophysical characterizations showcase the effectiveness SD processing sufficient donor/acceptor interpenetration vertical stratification, which eliminates dilemma charge generation/transport films. Meanwhile, D18 bottom layer proven helpful realizing fast evaporation postdeposited poor solvent, resulting naturally thickened well‐regulated crystallization. Furthermore, a new index emphasize based on nonfused acceptors, called figure‐of‐merit‐X (FoM‐X), has been defined. The processed herein, nm, 500 800 thicknesses possess leading FoM‐X values.

Language: Английский

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Intramolecular Lock Conjugated Polymer Electrolytes as the Cathode Interfacial Layer for Nonfullerene Organic Solar Cells

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(9), P. 3851 - 3862

Published: Feb. 21, 2024

D–A polymers exhibit excellent intramolecular charge transfer (ICT) properties due to the differences in energy levels. However, bulky dihedral angles between D and A units with conjugated structures have a negative impact on process of ICT, which inhibits efficient electron transport adjacent units. To solve this problem, noncovalent conformational locks were constructed by introduction π-bridges. Intriguingly, thiophene π-bridges containing sulfur elements can form S─H locks, not only extend structure overcome steric hindrance but also enhance efficiency transport. Therefore, PFPy-TT PFPy-TTBT exhibited superior short-circuit density (JSC) compared PFPy-BT without locks. Meanwhile, benzothiazole moiety exhibits stronger ICT better extraction structure. The enhanced enable intermolecular performance, realizing power conversion (PCE) 16.15%. By constructing using cathode interfacial layers (CILs), problem inferior coplanarity is resolved, favorable molecular alignment promoted, while demonstrating exceptional storage, light, heat, air stability. device maintains over 80% its initial PCE value when stored nitrogen condition for 120 h. These advances hold promise improving film quality organic solar cells.

Language: Английский

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Enhancing efficiency and stability of organic solar cells through a simplified four-step synthesis of fully non-fused ring electron acceptor

Journal of Energy Chemistry, Journal Year: 2024, Volume and Issue: 93, P. 601 - 608

Published: March 5, 2024

Language: Английский

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Enhanced photovoltaic performance of A–D–A’–D–A type non-fused ring electron acceptors via side chain engineering

Science China Materials, Journal Year: 2024, Volume and Issue: 67(5), P. 1594 - 1601

Published: April 15, 2024

Featuring simplified synthesis and flexible chemical alteration, non-fused ring electron acceptors (NFREAs) are the ideal candidates for constructing low-cost organic solar cells (OSCs). Herein, we report three A–D–A'–D–A type NFREAs, namely ffBTz-BO, ffBTz-EH, ffBTz-C4, where difluorinated benzotriazole (ffBTz) with different side chain lengths were employed as weak electron-deficient A' core. Compared ffBTz-BO ffBTz-EH appropriate length strikes a balance between enhanced molecular crystallinity favorable face-on orientation, resulting in high charge mobilities. Consequently, ffBTz-EH-based OSC delivered highest power conversion efficiency (PCE) of 12.96% enabled by its efficient transport most suitable phase separation, which represents one efficiencies among NFREAs. This work demonstrates that alkyl on central core plays critical role tuning crystallinity, active layer morphology, further device performance, provides meaningful perspective designing highly future.

Language: Английский

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