Impact of Electrostatic Interaction on Vertical Morphology and Energy Loss in Efficient Pseudo‐Planar Heterojunction Organic Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)

Published: Jan. 27, 2024

Abstract Although a suitable vertical phase separation (VPS) morphology is essential for improving charge transport efficiency, reducing recombination, and ultimately boosting the efficiency of organic solar cells (OSCs), there lack theoretical guidance on how to achieve ideal morphology. Herein, relationship between molecular structure VPS pseudo‐planar heterojunction (PPHJ) OSCs established by using surface electrostatic potential (ESP) as bridge. The morphological evolution mechanism revealed studying four binary systems with vary difference (∆ESP) donors (Ds) acceptors (As). findings manifest that ∆ESP increases, active layer more likely form well‐mixed phase, while smaller favors Interestingly, it also observed larger leads enhanced miscibility Ds As, resulting in higher non‐radiative energy losses (ΔE 3 ). Based these discoveries, ternary PPHJ device meticulously designed an appropriate obtain better lower ΔE , impressive 19.09% achieved. This work demonstrates optimizing ΔESP, not only formation can be controlled, but reduced, paving way further boost OSC performance.

Language: Английский

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

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(22)

Published: March 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.

Language: Английский

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C-shaped ortho-benzodipyrrole-based acceptors with different electronic effects of top substituents for as-cast green-solvent processed high-performance organic solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(18), P. 6844 - 6855

Published: Jan. 1, 2024

We systematically investigated the effects of top substituents on physicochemical properties SMAs and achieved highest PCE for OSCs processed using a non-halogenated solvent without any extra treatment.

Language: Английский

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Dynamic hydrogen-bonding enables high-performance and mechanically robust organic solar cells processed with non-halogenated solvent

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 17, 2025

Developing active-layer systems with both high performance and mechanical robustness is a crucial step towards achieving future commercialization of flexible stretchable organic solar cells (OSCs). Herein, we design synthesize series acceptors BTA-C6, BTA-E3, BTA-E6, BTA-E9, featuring the side chains hexyl, 3, 6, 9 carbon-chain ethyl ester end groups respectively. Benefiting from suitable phase separation vertical distribution, PM6:BTA-E3-based OSCs processed by o-xylene exhibit lower energy loss improved charge transport characteristic achieve power conversion efficiency 19.92% (certified 19.57%), which stands as highest recorded value in binary green solvents. Moreover, due to additional hydrogen-bonding provided chain, enhanced stretchability thermal stability. Our work reveals significance dynamic improving photovoltaic performance, robustness, morphological stability OSCs.

Language: Английский

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Advancing Heteroatom-Enhanced A-DA’D-A Pentacyclic Small Molecule-based Acceptors to Improve the Optoelectronic Characteristics for Organic Photovoltaics

Journal of Physics and Chemistry of Solids, Journal Year: 2025, Volume and Issue: unknown, P. 112610 - 112610

Published: Jan. 1, 2025

Language: Английский

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Central fluorination strategy of biphosphonic acid molecule for self-assembled monolayer enables efficient organic solar cells

Science China Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

Language: Английский

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Deciphering the Role of Rhodanine Flanked Non-Fullerene Acceptor Molecules for Efficient Organic Photovoltaics

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(7), P. 3314 - 3314

Published: April 2, 2025

In recent years, extensive research has been conducted with the aim of developing non-fullerene acceptors as they have a promising ability to drive development cost-effective and highly efficient organic solar cells (OSCs). By harnessing potential rhodanine-flanked (NFAs), we proposed eight new A-D-A type NFAs (SBA1-SBA8) through precise end-cap modifications on both sides bridging-core unit. We performed various advanced quantum chemical analyses unveil these designed materials' compared them synthetic reference molecule (R). The series presented lower binding excitation energy, along narrower energy gaps 2.11 eV enhanced absorption at 671.20 nm 719.88 in gaseous chloroform environments, respectively. Furthermore, optoelectronic photophysical characterizations related electrostatic potential, density states, reorganization electron hole mobilities, transition matrix analysis reveal that materials could be efficiently used acceptor for photovoltaics. Additionally, check impact charge transfer donor: (D: A) interface, studied PTB7-Th:SBA1 D:A demonstrated remarkable interface phenomenon. Therefore, engineered SBA1-SBA8 represent significant advancement sustainable effective options high-performance OSCs.

Language: Английский

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Rational Design of Two Well‐Compatible Dimeric Acceptors Through Regulating Chalcogen‐Substituted Conjugated Backbone Enable Ternary Organic Solar Cells with 19.4% Efficiency

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

Published: Nov. 12, 2024

Abstract To enhance the performance of dimeric acceptors (DMAs) based organic solar cells (OSCs), two new DMAs, designated as DC9‐HD and DYSe‐3, are rationally developed employed to fabricate ternary OSCs. The substitution sulfur atom on outer ring fused‐ring core with a selenium resultes in red‐shifted DYSe‐3. Despite these minor differences, DYSe‐3 possess nearly identical conjugated skeletons, which contribute their similar packing motifs crystallinities, ultimately enabling high degree miscibility between DMAs. Upon incorporating into host PM6:DC9‐HD binary blend, fibril‐like morphologies featured diameters ≈16.9 nm reduced charge recombination observed PM6:DC9‐HD:DYSe‐3 blend. More importantly, owing long exciton diffusion lengths low voltage losses, remarkable power conversion efficiency 19.4% is achieved for OSCs, alongside delicate balance open‐circuit short‐circuit current density. This super result comparable best oligomer acceptor OSCs reported date. Furthermore, proposed strategy, combines one polymer donor well‐compatible not only retains advantages DMAs but also offers streamlined approach fabricating high‐performance

Language: Английский

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Giant Molecule Acceptors for High Performance Polymer Solar Cells

Giant, Journal Year: 2024, Volume and Issue: 20, P. 100336 - 100336

Published: Aug. 23, 2024

Language: Английский

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Fine-tuning of film morphology through addition of a third component enables organic solar cells with efficiency over 18%

Materials Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 8(15), P. 2657 - 2665

Published: Jan. 1, 2024

By incorporating an acceptor Y-TNF with a structure analogous to Y6 as the third component, nanofiber of active layer is further optimized, molecular arrangement more ordered, and PCE device reaches 18.1%.

Language: Английский

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