Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties

Zhu, Lei; Zhang, Ming; Zhou, Guanqing; Hao, Tianyu; Xu, Jinqiu; Wang, Jing; Qiu, Chaoqun; Prine, Nathaniel; Ali, Jazib; Feng, Wei; Gu, Xiaodan; Ma, Zaifei; Tang, Zheng; Zhu, Haiming; Ying, Lei; Zhang, Yongming; Liu, Feng

doi:10.1002/aenm.201904234

Cited by 430 publications

(482 citation statements)

References 56 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

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“…For the PM6:Y6 blend films, the absorption peak (within 750$900 nm, belongs to Y6) and the onset of XY-processed film are still red-shifted in comparison with that of CF-processed film, indicating that the aggregation of Y6 was still stronger in XY-processed PM6:Y6 film. 32 In contrast, XY-processed PM6:DTY6 blend films exhibit nearly identical absorption peak with that of CF-processed blend film.…”

Section: Synthesis and Characterizationsmentioning

confidence: 99%

“…To further verify these phenomena, the Hansen solubility parameters of PM6, Y6, and DTY6 were calculated by group contribution methods: d PM6 = 19.20, d Y6 = 19.80, and d DTY6 = 18.60. 32,33 Hansen solubility parameters of solvent CF and XY are d CF = 18.95 and d XY = 18.10. The Flory-Huggins interaction parameters of solvents and molecules (c s-m ) were further calculated: c CF-PM6 = 0.342, c XY-PM6 = 0.399, c CF-Y6 = 0.364, c XY-Y6 = 0.483, c CF-DTY6 = 0.342, and c XY-DTY6 = 0.357.…”

Section: Morphology Characterization Of Blend Filmsmentioning

confidence: 99%

Single-Component Non-halogen Solvent-Processed High-Performance Organic Solar Cell Module with Efficiency over 14%

Dong

Jia

Zhang

et al. 2020

Joule

240

232

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“…We used quaternary blends, comprised of existing donor-acceptor pairs mixed with additional donor and acceptor components to mediate de ciencies in electronic performance or morphology, to address this high short-circuit current (J SC , ~25 mA/cm 2 ), and low energy loss (E loss , 0.5-0.6 eV) [15][16][17][18][19] . Enhancement of the photovoltaic characteristics requires more e cient exciton splitting and carrier transport pathways in the active layer.…”

Section: Introductionmentioning

confidence: 99%

Single-layered organic photovoltaics with double cascading charge transport pathways: 18 % efficiencies

Zhang

Zhu

Zhou

et al. 2020

Preprint

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The chemical structure of donors (Ds) and acceptors (As) limit the power conversion efficiencies (PCEs) achievable with bulk heterojunction (BHJ) active layers of binary D-A mixtures. However, using quaternary D-A blends, double cascading energy level alignment in BHJ organic photovoltaic active layers are realized, enabling efficient carrier splitting and transport. Numerous avenues to optimize light absorption, carrier transport, and charge transfer state energy levels are opened by the chemical constitution of the components. Record-breaking PCEs of 18.07% are achieved where, by electronic structure and morphology optimization, simultaneous improvements of the open-circuit voltage, short-circuit current and fill factor occur. The D and A chemical structures afford control over electronic structure and charge transfer state energy levels, enabling manipulation of hole-transfer rates, carrier transport, and non-radiative recombination losses.

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Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties

Cited by 430 publications

References 56 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

Single-Component Non-halogen Solvent-Processed High-Performance Organic Solar Cell Module with Efficiency over 14%

Single-layered organic photovoltaics with double cascading charge transport pathways: 18 % efficiencies

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