Achieving organic solar cells with efficiency over 14% based on a non-fullerene acceptor incorporating a cyclopentathiophene unit fused backbone

Cai, Yao; Meng, Lingxian; Gao, Huanhuan; Guo, Ziqi; Zheng, Nan; Xie, Zengqi; Zhang, Hongtao; Li, Chenxi; Wan, Xiangjian; Chen, Yongsheng

doi:10.1039/d0ta00677g

Cited by 22 publications

(14 citation statements)

References 44 publications

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“…The metal-free dye structure relies on a triphenylamine (TPA) donor group functionalized by two protected carboxylic acid groups for its future anchoring onto semiconducting oxide-based electrodes and a cyanoacrylate/cyanoacrylamide acceptor group, separated by the electron-rich cyclopenta[1,2b:5,4-b']dithiophene (CPDT) bridge. The latter is classically employed as a building block in organic photovoltaics or for dye-sensitized solar cell applications, thanks to its increased light absorption properties in the visible region of the spectrum [23,24].…”

Section: Introductionmentioning

confidence: 99%

Investigating Light-Induced Processes in Covalent Dye-Catalyst Assemblies for Hydrogen Production

et al. 2020

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The light-induced processes occurring in two dye-catalyst assemblies for light-driven hydrogen production were investigated by ultrafast transient absorption spectroscopy. These dyads consist of a push-pull organic dye based on a cyclopenta[1,2-b:5,4-b’]dithiophene (CPDT) bridge, covalently linked to two different H2-evolving cobalt catalysts. Whatever the nature of the latter, photoinduced intramolecular electron transfer from the excited state of the dye to the catalytic center was never observed. Instead, and in sharp contrast to the reference dye, a fast intersystem crossing (ISC) populates a long-lived triplet excited state, which in turn non-radiatively decays to the ground state. This study thus shows how the interplay of different structures in a dye-catalyst assembly can lead to unexpected excited state behavior and might open up new possibilities in the area of organic triplet sensitizers. More importantly, a reductive quenching mechanism with an external electron donor must be considered to drive hydrogen production with these dye-catalyst assemblies.

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Section: Introductionmentioning

confidence: 99%

Investigating Light-Induced Processes in Covalent Dye-Catalyst Assemblies for Hydrogen Production

et al. 2020

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“…Recently, Cai et al. synthesized and studied a new acceptor, BCPT‐4F, which comprises a CPT (cyclopentadithiophene)‐fused central backbone [119] . In comparison to CPT‐based acceptors having an unfused backbone, BCPT‐4F demonstrated a red‐shifted absorption in NIR.…”

Section: Challenges and Opportunities For Achieving Higher Efficiency...mentioning

confidence: 99%

Recent Progress in Advanced Organic Photovoltaics: Emerging Techniques and Materials

et al. 2022

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Organic photovoltaics have received active research interest during the past 30 years due to their low cost, flexibility, easy scalability, and robustness. Recently, several efforts have been made to enhance their power conversion efficiency (PCE) and stability by considering advanced photon harvesting technology, utilization of novel donor–acceptor materials, and optimizing device design strategy. Specifically, the photon multiplication process like singlet fission (SF) and design of novel materials, including low‐bandgap conjugated polymers and non‐fullerene acceptors (NFA), have led to the development of advanced organic photovoltaics with PCE close to theoretical Shockley–Queisser (SQ) limit. Here, an up‐to‐date overview of the recent progress during the last five years in advanced organic photovoltaics with a special focus on emerging techniques and materials was reported. Further, various designing and deployment strategies for these processes and materials were explored along with their properties, challenges, and achievements. Finally, a strategy for the next‐stage research directions was analyzed and proposed that could drive this field even further beyond laboratory research to reach the final goal of commercialization.

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“…[ 119–122 ] Incorporating appropriate third component into binary host system, the PCE of ternary OSCs can be increased by more than 10% due to various factors such as alignment of the cascade energy level, the formation of alloys, optimized morphology, and increased charge mobility. [ 123–126 ] The ternary strategy may have a positive effect on the performance improvement of thick‐film OSCs. In this part, we summarize the recent progress of efficient ternary thick‐film OSCs, which can be classified into three categories of two donors with one NFA, one donor with one NFA and one FA, as well as one donor with two NFAs.…”

Section: Categories Of Efficient Thick‐film Oscsmentioning

confidence: 99%

A Critical Review on Efficient Thick‐Film Organic Solar Cells

Gao

Wang

et al. 2020

Solar RRL

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To date, the power conversion efficiency (PCE) of lab‐scale organic solar cells (OSCs) has exceeded 17%, which heralds the bright future for commercial applications of OSCs. High‐performance OSCs with thick active layers are essential for large‐scale production. First, the relatively thick active layers should be more compatible with the roll‐to‐roll (R2R) large‐area processing, which is conducive to forming uniform and defect‐free active layers in the process of high‐speed, mass production. Second, the thick active layers can absorb more incident light in their spectral range, which helps thick‐film OSCs to obtain relatively high short‐circuit current density (JSC). So far, relatively little attention has been paid to thick‐film OSCs, and the PCE of thick‐film OSCs lags far behind its thin‐film analogues. Herein, the recent development of thick‐film OSCs is highlighted and the critical limit factors on the PCE of thick‐film OSCs are pointed out. Some strategies are highlighted to improve the efficiency of thick‐film OSCs. This review study will be helpful to the researchers engaging in the development of efficient thick‐film OSCs.

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Achieving organic solar cells with efficiency over 14% based on a non-fullerene acceptor incorporating a cyclopentathiophene unit fused backbone

Abstract: An acceptor molecule with a cyclopentathiophene fused backbone, BCPT-4F, has been designed and synthesized. A power conversion efficiency of 14.23% was achieved for BCPT-4F based organic solar cells.

Cited by 22 publications

References 44 publications

Investigating Light-Induced Processes in Covalent Dye-Catalyst Assemblies for Hydrogen Production

Investigating Light-Induced Processes in Covalent Dye-Catalyst Assemblies for Hydrogen Production

Recent Progress in Advanced Organic Photovoltaics: Emerging Techniques and Materials

A Critical Review on Efficient Thick‐Film Organic Solar Cells

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