Conjugated π-Extension of Small Molecular Nonfullerene Acceptor for Efficient Ternary Organic Solar Cells with an Efficiency of 19.10%

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

In this study, we have successfully incorporated a small molecular acceptor, Y-LC, with conjugated π-extension as secondary acceptor in the PM6:BTP-eC9-based organic photovoltaics. The performance of device was significantly promoted from 18.45% binary system PM6:BTP-eC9 to over 19% ternary minimal Y-LC loading. This enhancement can be attributed alloy-like structures acceptors and optimized active layer morphology, which leads improved hole electron mobilities, thereby suppressing charge recombination, finally resulting higher photocurrent solar cells. Furthermore, complementary absorption is observed PM6 BTP-eC9, broaden spectrum photoactive enable more photons sunlight absorbed. Additionally, facilitates efficient transfer donor by forming cascade energy levels between BTP-eC9. These advantages collectively contribute superior obtained work also highlights that adoption nonfullerene suitable π-extensions minor additive photovoltaics powerful approach for achieving state-of-the-art

Language: Английский

---

Tailoring small-molecule acceptors through asymmetric side-chain substitution for efficient organic solar cells

Science China Materials, Journal Year: 2025, Volume and Issue: 68(3), P. 860 - 867

Published: Feb. 13, 2025

Language: Английский

---

Medium‐Bandgap Acceptors for Efficient Ternary Organic Solar Cells Achieved by End‐Group Engineering

Solar RRL, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

The ternary strategy has been evidenced as one of the most crucial methods to improve photovoltaic performance organic solar cells. However, selection and design third components are decisive factors facilitating progress cells (TOSCs). In this study, focuses concentrated on D18‐Cl:N3 binary host device by developing a weakly electron‐withdrawing end group synthesizing guest acceptor, BTP‐CM, which holds similar backbone N3. structure resemblance ensures good compatibility molecule with N3, improves charge transport reduces recombination. Thereby, D18‐Cl:N3:BTP‐CM‐based TOSC exhibits an improved power conversion efficiency 18.32%, compared 17.13% device. This work provides effective for acceptors, aims introduce new groups obtain molecules complementary absorptions matched energy levels while preserving molecular acceptor.

Language: Английский

---

Trifluoroacetic Acid‐Induced Adsorption Dipole Modulation of Perylene Diimide Dipole Moment Enables 19.5% Efficiency in Binary Organic Solar Cells

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

Published: April 19, 2025

Abstract Perylene diimides (PDIs) have emerged as promising materials for cathode interfacial layers (CILs) in organic solar cells (OSCs) due to their advantageous energy level alignment with active layer and insensitivity film thickness, enabling the easy fabrication of efficient large‐area devices. However, inherent low dipole moment PDIs results suboptimal charge transport properties, limiting device performance. Herein, a new strategy by incorporating trifluoroacetic acid (TFA) into PDI material fabricate compound large number moments is introduced. Density functional theory calculations reveal that highly electronegative F groups attract ammonium end PDIN significantly increase from 0.3 2.6 Debye, enhancing transfer OSCs. By optimizing TFA concentration 2% using CILs, champion efficiencies 18.0% 19.5% are achieved state‐of‐the‐art binary comprising PM6:Y6 PM6:L8‐BO (Layer‐by‐Layer), respectively. Notably, these devices maintain 88.3% initial efficiency after 240 h, demonstrating exceptional operational stability. The work shows F‐induced adsorbed not only provides mechanism design but also paves way achieving high‐efficiency stable

Language: Английский

---

Fabricating High‐Performance Organic Solar Cells by Using Inside‐Chain Chlorinated Acceptor as a Ternary Component

Small, Journal Year: 2025, Volume and Issue: unknown

Published: May 19, 2025

Abstract In this study, two molecules, WLA1 and WLA2, with the same molecular backbone but different degrees of inside‐chain chlorination, are designed synthesized to elucidate effects chlorine substitution strategies on morphology small‐molecule acceptors blended films. The chlorinated WLA2 enhances crystallinity stacking. For binary organic solar cells (OSCs), corresponding films exhibit suitable phase separation crystallinity. Therefore, WLA2‐based OSCs achieve a power conversion efficiency (PCE) 16.80%, which is higher than that WLA1‐based (16.21%). ternary blending strategy, incorporated into D18:L8‐BO system as third component, introduction acceptor further improves facilitates induction fiber formation. have significantly exciton diffusion charge transport efficiencies compared L8‐BO WLA1. PCE 19.64%. This study emphasizes great potential combining an molecule strategy prepare high‐performance OSCs.

Language: Английский

---