A high-efficiency and stable organic solar cell with balanced crystallization kinetics

Zhang, Weichao; Yue, Yaochang; Yang, Rongsheng; Zhang, Yingyu; Du, Wenna; Lu, Guanghao; Zhang, Jianqi; Zhou, Huiqiong; Zhang, Xuning; Zhang, Yuan

doi:10.1039/d3ee04169g

Cited by 20 publications

(1 citation statement)

References 52 publications

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“…With the increasing demand for eco-friendly and sustainable energy, solution-processed bulk-heterojunction organic solar cells (OSCs) have attracted considerable attention owing to their inherent advantages in printing fabrication, cost-effectiveness, flexibility, and lightweight properties. − In recent years, nonfullerene acceptors (NFAs), particularly small-molecule acceptors (SMAs), have demonstrated significant progress. The development and design of numerous SMAs have invigorated the field of organic photovoltaics, leading to advancements in the OSC power conversion efficiency (PCE) of up to 19%. ,− Among the various fused-ring SMAs, those adopting acceptor–donor–acceptor (A–D–A) and A-DA 1 D-A-type molecule structures, such as ITIC and Y6, are esteemed for their exceptional device performance. − Typically, these SMAs comprise three essential components: a fused-ring core, side chains, and electron-withdrawing end-groups. Additionally, various strategies for molecular modification have emerged.…”

Section: Introductionmentioning

confidence: 99%

Nonfullerene Acceptors with Aromatic Heterocycle Substitutions for Efficient Organic Solar Cells

Zeng,

Wu,

Ren

et al. 2024

ACS Appl. Energy Mater.

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Modifying the end groups of nonfullerene acceptors presents a viable strategy for enhancing the efficiency of organic solar cells (OSCs). This study synthesized three nonfullerene acceptors�BO-ICTz, BO-ICTzTh, and BO-ICTh�by incorporating aromatic heterocycle substitutions into the end group. These substitutions included an electron-donating thiophene ring, an electron-withdrawing thiazole ring, and a combination of both asymmetric rings. BO-ICTh, exhibiting a stronger conjugation effect, exhibited robust and broad absorption spectra, along with elevated energy levels. When blended with the polymer donor JD40-BDD20, the optimized BO-ICTh-based device achieved a champion power conversion efficiency (PCE) of 16.25%, surpassing devices based on BO-ICTz and BO-ICTzTh. Further analysis of energy loss, charge generation, recombination, and morphology demonstrated that incorporating the aromatic heterocycle ring into the end group presents as a promising strategy for developing nonfullerene acceptors, thereby enhancing the performance of organic photovoltaic devices.

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Section: Introductionmentioning

confidence: 99%

Nonfullerene Acceptors with Aromatic Heterocycle Substitutions for Efficient Organic Solar Cells

Zeng,

Wu,

Ren

et al. 2024

ACS Appl. Energy Mater.

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Enabling High‐Efficiency and Stable Binary Organic Solar Cells by Solid Additive‐Assisted Morphology Modulation

Cheng,

Li,

Zhang

et al. 2024

Adv Funct Materials

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The solid additive strategy represents a simple yet effective approach to achieving high‐efficiency organic solar cells (OSCs) by enhancing the morphology of the active layer. In this study, a highly volatile solid additive, 2,4,6‐trichloro‐1,3,5‐triazine (TCT), is employed to modulate the morphology. Unlike other solid additives previously reported, TCT exhibits remarkable intermolecular interactions with both polymer donor and acceptor, offering two distinct advantages. Firstly, TCT notably enhances the crystallinity and molecular order of the blend film, subtly optimizing the fiber network structure within, thereby facilitating carrier transport and significantly improving the mobility of the blend film. Secondly, TCT stabilizes the bi‐continuous fibrous morphology of the polymer donor and acceptor, mitigating the morphological evolution of the active layer and enhancing device stability. Consequently, the D18:L8‐BO:TCT device exhibits a higher power conversion efficiency of 19.50% compared to the D18:L8‐BO device (18.13%). Furthermore, after 960 h of storage, the OSC device treated with TCT retains 90% of its initial PCE, significantly outperforming the D18:L8‐BO device (73%). This study presents a promising avenue for achieving high‐performance OSCs through manipulating the active layer morphology with solid additives.

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The Multi‐Functional Third Acceptor Realizes the Synergistic Improvement in Photovoltaic Parameters and the High‐Ratio Tolerance of Ternary Organic Photovoltaics

Liu,

Zhan,

et al. 2024

Advanced Science

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The ternary strategy proves effective for breakthroughs in organic photovoltaics (OPVs). Elevating three photovoltaic parameters synergistically, especially the proportion‐insensitive third component, is crucial for efficient ternary devices. This work introduces a molecular design strategy by comprehensively analyzing asymmetric end groups, side‐chain engineering, and halogenation to explore the outstanding optoelectronic properties of the proportion‐insensitive third component in efficient ternary systems. Three asymmetric non‐fullerene acceptors (BTP‐SA1, BTP‐SA2, and BTP‐SA3) are synthesized based on the Y6 framework and incorporated as the third component into the D18:Y6 binary system. BTP‐SA3, featuring asymmetric terminal (difluoro‐indone and dichloride‐cyanoindone terminal), with branched alkyl side chains, exhibited high open‐circuit voltage (VOC), balanced crystallinity and compatibility, achieving synergistic enhancements in VOC (0.862 V), short circuit‐current density (JSC, 27.52 mA cm−2), fill fact (FF, 81.01%), and power convert efficiency (PCE, 19.19%). Device based on D18/Y6:BTP‐SA3 (layer‐by‐layer processed) reached a high efficiency of 19.36%, demonstrating a high tolerance for BTP‐SA3 (10–50%). This work provides novel insights into optimizing OPVs performances in multi‐component systems and designing components with enhanced tolerance.

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A high-efficiency and stable organic solar cell with balanced crystallization kinetics

Abstract: Obtaining controllable morphology in organic solar cells (OSCs) is long-sought for improving the photovoltaic efficiency and long-term stability toward meaningful applications. Herein, we report a conceptual multiple acceptor OSC based...

Cited by 20 publications

References 52 publications

Nonfullerene Acceptors with Aromatic Heterocycle Substitutions for Efficient Organic Solar Cells

Nonfullerene Acceptors with Aromatic Heterocycle Substitutions for Efficient Organic Solar Cells

Enabling High‐Efficiency and Stable Binary Organic Solar Cells by Solid Additive‐Assisted Morphology Modulation

The Multi‐Functional Third Acceptor Realizes the Synergistic Improvement in Photovoltaic Parameters and the High‐Ratio Tolerance of Ternary Organic Photovoltaics

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