Thiolactone copolymer donor gifts organic solar cells a 16.72% efficiency

Xiong, Jie; Jin, Ke; Yin, Jiuli; Qin, Jianqiang; Tan, Wenfa; Liu, Jinfeng; Liu, Qishi; Peng, Huanhua; Li, Xiongfeng; Sun, Anxin; Meng, Xianghe; Zhang, Lixiu; Liu, Ling; Li, Wenting; Fang, Zhimin; Xue, Jia; Xiao, Zuo; Feng, Yaqing; Zhang, Xiaotao; Sun, Kuan; Yang, Shangfeng; Shi, Shengwei; Ding, Liming

doi:10.1016/j.scib.2019.10.002

Cited by 144 publications

(83 citation statements)

References 18 publications

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“…Organic solar cells (OSCs) have great prospects for many industrial applications thanks to their flexibility, semitransparency, and light weight. [ 1–6 ] Nonfullerene small molecular acceptors (SMAs) [ 7–29 ] are the main driving force for the recent development of the field, with power conversion efficiencies (PCEs) over 17% reported by different teams. [ 30–43 ] SMAs have many attractive properties including their strong and tunable absorption, the easily adjustable energy levels and the enhanced chemical and device stability.…”

Section: Methodsmentioning

confidence: 99%

Understanding the Effect of End Group Halogenation in Tuning Miscibility and Morphology of High‐Performance Small Molecular Acceptors

et al. 2020

Solar RRL

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A multitude of studies have been conducted on organic solar cells (OSCs) to understand how end group halogenation changes the property of the small molecular acceptors (SMAs) energetically, morphologically, and so on. But how the halogenation impacts the miscibility between SMAs and polymers, which is an important index to thermodynamically predict and understand the morphology of blend films, has not been systematically studied, particularly for the state‐of‐the‐art polymer–SMA blends. Herein, three series of asymmetric or symmetric SMAs, all reported recently with high photovoltaic performances, are used to investigate the effect of halogenation on miscibility, crystallinity, and solar cell performance. Using the asymmetric SMA named TPIC, and its derivatives (TPIC‐4F and TPIC‐4Cl) as the focus, it is revealed that the enhancement in solar cell performance for the halogenated SMAs is to reduce the miscibility between the acceptor and donor, which leads to a more favorable morphology, enhanced charge transport, and an extended absorption range. Similarly, the halogenation‐induced reduction in miscibility for the initially overmixed donor:acceptor blend is also demonstrated in the symmetric ITIC and the state‐of‐the‐art BTP series, where attractive power conversion efficiencies (PCEs) of 16.5% and 16.8%, respectively, are achieved by the halogenated‐SMA‐based devices in each series.

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Section: Methodsmentioning

confidence: 99%

Understanding the Effect of End Group Halogenation in Tuning Miscibility and Morphology of High‐Performance Small Molecular Acceptors

et al. 2020

Solar RRL

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“…Single bulk heterojunction polymer solar cells (PSCs) have achieved dramatic progress through material evolution, device fabrication optimization and working mechanism exploration [1][2][3][4][5][6][7][8][9]. The power conversion efficiency (PCE) of PSCs has already exceeded 16% with narrow band gap nonfullerene material Y6 as acceptor [10][11][12][13][14]. Based on the well optimized binary PSCs, ternary strategy also exhibits great potential in improving PSCs performance by selecting the well matched third component and employing appropriate device engineering [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Alloy-like ternary polymer solar cells with over 17.2% efficiency

et al. 2020

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“…Their easily‐tailored chemical structures allow judicious optimization of optical properties, energy levels and crystallization/aggregation properties . The power conversion efficiencies (PCEs) of OSCs have grown rapidly in the past two decades: from an initial PCE of 1% to more than 16% nowadays in single‐junction devices . Though continuous progression on developing SMAs has enabled high‐performance OSCs, there are still several critical issues need to be overcome for the purpose of practical applications .…”

Section: Introductionmentioning

confidence: 99%

Thick‐Film Organic Solar Cells Achieving over 11% Efficiency and Nearly 70% Fill Factor at Thickness over 400 nm

Gao

Hao

et al. 2020

Adv Funct Materials

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Thickness‐insensitive small molecule acceptors (SMAs) are still a great challenge for developing thick‐film organic solar cells (OSCs) towards practical use. Herein, two SMAs, MF1 and MF2, are designed and synthesized by employing a bifunctional end group with fluorine and methyl moieties. Combined with fused‐ring cores with alkyl side chains, both MF1 and MF2 exhibit ordered π–π stacking and high charge carrier mobilities in neat and blend films. The champion devices based on PM7:MF1 and PM7:MF2 deliver high power conversion efficiencies (PCEs) of 12.4% and 13.7%, and high fill factors (FFs) of 78.3% and 74.5%, respectively. With increasing active layer thickness, the FFs of the OSCs decrease relatively slowly, demonstrating the preferrable properties of MF1 and MF2 in terms of their thickness insensitivity, especially for MF1. As a result, the two thick‐film OSCs achieve over 11% PCEs at an active layer thickness over 400 nm (an FF close to 70% for PM7:MF1) and over 10% PCEs when the thickness is increased up to 500 nm. These are the highest PCEs among OSCs with such active layer thicknesses to date. This work reveals a molecular design strategy by reasonably combining fluorine and methyl together to simultaneously enhance charge carrier mobilities and fine‐tune the morphology, which is beneficial to achieve high‐performance thick‐film OSCs.

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Thiolactone copolymer donor gifts organic solar cells a 16.72% efficiency

Cited by 144 publications

References 18 publications

Understanding the Effect of End Group Halogenation in Tuning Miscibility and Morphology of High‐Performance Small Molecular Acceptors

Understanding the Effect of End Group Halogenation in Tuning Miscibility and Morphology of High‐Performance Small Molecular Acceptors

Alloy-like ternary polymer solar cells with over 17.2% efficiency

Thick‐Film Organic Solar Cells Achieving over 11% Efficiency and Nearly 70% Fill Factor at Thickness over 400 nm

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