Dual-functional ambipolar non-fused ring electron acceptor as third component and designing similar molecular structure between two acceptors for high-performance ternary organic solar cells

Luo, Dou; Jiang, Zhengyan; Yang, Wanli; Guo, Xugang; Li, Xuehui; Li, Gongqiang; Li, Lanqing; Duan, Chenghao; Shan, Chengwei; Wang, Zhaojin; Xu, Baomin; Kyaw, Aung Ko Ko

doi:10.1016/j.nanoen.2022.107186

Cited by 37 publications

(38 citation statements)

References 62 publications

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“…Hence, owning to the structural versatility of BODIPY that enables fine‐tuning of its photophysical and optoelectronic properties, we engineer a novel donor–acceptor–donor (D–A–D) configuration, in form of TPA‐azaBODIPY‐TPA, that offers a highly desirable absorption redshift, optimal charge transfer characteristics, and excitation energy levels, while maintaining high solubility and processability. Materials featuring dual functions of both electron accepting and donating are also reported as an effective strategy to improve the efficiency of organic optoelectronic devices 39 . In this work, we show that the newly developed TPA‐azaBODIPY‐TPA conjugated small molecule acts as an ultra‐thin (6 nm) hole transport layer (HTL) in PSCs to achieve superior performance in comparison to control PSCs based on the conventional PEDOT:PSS HTL.…”

Section: Introductionmentioning

confidence: 88%

“…Materials featuring dual functions of both electron accepting and donating are also reported as an effective strategy to improve the efficiency of organic optoelectronic devices. 39 In this work, we show that the newly developed TPA-azaBODIPY-TPA conjugated small molecule acts as an ultra-thin (6 nm) hole transport layer (HTL) in PSCs to achieve superior performance in comparison to control PSCs based on the conventional PEDOT:PSS HTL. Power conversion efficiencies (PCEs) of over 17% highlight the material's promising utilization in next-generation light-harvesting PSCs with robust thermal stability.…”

Section: Introductionmentioning

confidence: 97%

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Versatile aza‐BODIPY‐based low‐bandgap conjugated small molecule for light harvesting and near‐infrared photodetection

Bhat

Kielar

Rao

et al. 2022

InfoMat

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The versatile nature of organic conjugated materials renders their flawless integration into a diverse family of optoelectronic devices with light-harvesting, photodetection, or light-emitting capabilities. Classes of materials that offer the possibilities of two or more distinct optoelectronic functions are particularly attractive as they enable smart applications while providing the benefits of the ease of fabrication using low-cost processes. Here, we develop a novel, multipurpose conjugated small molecule by combining boron-azadipyrromethene (aza-BODIPY) as electron acceptor with triphenylamine (TPA) as end-capping donor units. The implemented donor-acceptor-donor (D-A-D) configuration, in the form of TPA-azaBODIPY-TPA, preserves ideal charge transfer characteristics with appropriate excitation energy levels, with the additional ability to be used as either a charge transporting interlayer or light-sensing semiconducting layer in optoelectronic devices. To demonstrate its versatility, we first show that TPA-azaBODIPY-TPA can act as an excellent hole transport layer in methylammonium lead triiodide (MAPbI 3 )-based perovskite solar cells with measured power conversion efficiencies exceeding 17%, outperforming control solar cells with PEDOT:PSS by nearly 60%. Furthermore, the optical bandgap of 1.49 eV is shown to provide significant photodetection in the wavelength range of up to 800 nm where TPA-azaBODIPY-TPA functions as donor in

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 97%

Versatile aza‐BODIPY‐based low‐bandgap conjugated small molecule for light harvesting and near‐infrared photodetection

Bhat

Kielar

Rao

et al. 2022

InfoMat

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“…The synthesis procedure of C8C8–4Cl is the same as in the literature . C8C8–4Cl was obtained as a black solid (288.6 mg, 83%).…”

Section: Methodsmentioning

confidence: 99%

Simultaneous Tuning of Alkyl Chains and End Groups in Non-fused Ring Electron Acceptors for Efficient and Stable Organic Solar Cells

Luo

Jiang

Shan

et al. 2022

ACS Appl. Mater. Interfaces

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Fine-tuning the alkyl chains and end groups of non-fused ring electron acceptors (NFREAs) plays vital roles in the promotion of charge transfer (CT) and power conversion efficiency (PCE). In this work, we developed a series of A−D−A′−D−A-type NFREAs, which possess the same terminals (A), the cyclopentadithiophene unit (D), and the thieno[3,4-c]pyrrole-4,6-dione (A′). Despite the subtle difference in side chains and halogenated end groups, the six acceptors exhibit a considerable difference in the efficiency and device stability of the organic solar cells (OSCs). Among the molecules, chlorinated NFREAs show a broader light absorption than the fluorinated ones do. Compared with C8C8−4F (1-octylnonyl and fluorination) and C6C4−4Cl (2-butyloctyl and chlorination), C8C8−4Cl (1-octylnonyl and chlorination) exhibits a lower highest occupied molecular orbital level, higher electron mobility, and denser molecular packing. The OSCs based on PM6:C8C8−4Cl yield the best PCE of 14.11%, which is attributed to the faster charge transport, high miscibility, and preferable morphology. Moreover, the PM6:C8C8−4Cl devices retain 91.1% of the initial PCE after being placed in air with 67% relative humidity for 50 days. This work shows that the simultaneous optimization of side chains and end groups facilitates the CT and improves the stability in the OSCs, offering a novel view into the molecular design of A−D−A′−D−A-type NFREAs.

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“…Then, side‐chain and terminal group engineering were carried out for TPDC‐4F, a NFREA C8C8‐4Cl was synthesized by the same group. [ 102 ] The OSC based on PM6:C8C8‐4Cl yielded a PCE of 13.96% due to the improved charge transport, suppressed charge recombination, and optimal blend morphology. They also tried to design a NFREA with BTI as the core.…”

Section: Nfreas With A‐d‐a’‐d‐a Structurementioning

confidence: 99%

Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

Bai

Liang

et al. 2022

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The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have improved considerably in recent years with the development of fused-ring electron acceptors (FREAs). Currently, FREAs-based OSCs have achieved high PCEs of over 19% in single-junction OSCs. Whereas the relatively high synthetic complexity and the low yield of FREAs typically result in high production costs, hindering the commercial application of OSCs. In contrast, noncovalently fused-ring electron acceptors (NFREAs) can compensate for the shortcomings of FREAs and facilitate large-scale industrial production by virtue of the simple structure, facile synthesis, high yield, low cost, and reasonable efficiency. At present, OSCs based on NFREAs have exceeded the PCEs of 15% and are expected to reach comparable efficiency as FREAs-based OSCs. Here, recent advances in NFREAs in this review provide insight into improving the performance of OSCs. In particular, this paper focuses on the effect of the chemical structures of NFREAs on the molecule conformation, aggregation, and packing mode. Various molecular design strategies, such as core, side-chain, and terminal group engineering, are presented. In addition, some novel polymer acceptors based on NFREAs for all-polymer OSCs are also introduced. In the end, the paper provides an outlook on developing efficient, stable, and low-cost NFREAs for achieving commercial applications.

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Dual-functional ambipolar non-fused ring electron acceptor as third component and designing similar molecular structure between two acceptors for high-performance ternary organic solar cells

Cited by 37 publications

References 62 publications

Versatile aza‐BODIPY‐based low‐bandgap conjugated small molecule for light harvesting and near‐infrared photodetection

Versatile aza‐BODIPY‐based low‐bandgap conjugated small molecule for light harvesting and near‐infrared photodetection

Simultaneous Tuning of Alkyl Chains and End Groups in Non-fused Ring Electron Acceptors for Efficient and Stable Organic Solar Cells

Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

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