Efficient and thermally stable organic solar cells based on small molecule donor and polymer acceptor

Zhang, Zijian; Miao, Junhui; Ding, Zicheng; Kan, Bin; Lin, Baojun; Wan, Xiangjian; Ma, Wei; Chen, Yongsheng; Long, Xinggui; Dou, Chuandong; Zhang, Jidong; Liu, Jun; Wang, Lixiang

doi:10.1038/s41467-019-10984-6

Cited by 115 publications

(92 citation statements)

References 51 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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“…The small-molecule donor of DR3TBDTC was synthesized as the reported method in our laboratory. 50 Synthesis of DC3TBDTC. Compound (1) 50 (0.10 g, 0.057 mmol) and methyl 2-cyanoacetate (0.057 g, 0.57 mmol) were dissolved in anhydrous CHCl 3 (15 mL), and then two drops of triethylamine were added to the mixture.…”

Section: Methodsmentioning

confidence: 99%

“…[44][45][46][47][48][49] Recently, we have developed a small-molecule donor with large steric hindrance at the core to inhibit the aggregation of backbones, and greatly improved the performance of M D /P Atype OSCs. 50 The preliminary result motivates us to investigate the structure-performance relationship of molecules and develop efficient small-molecule donors for M D /P A -type OSCs.…”

Section: Introductionmentioning

confidence: 99%

Small-Molecule Donor/Polymer Acceptor Type Organic Solar Cells: Effect of Terminal Groups of Small-Molecule Donors

Miao

Meng

et al. 2019

Organic Materials

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Small-molecule donor/polymer acceptor type (MD/PA-type) organic solar cells (OSCs) have the great advantage of superior thermal stability. However, very few small molecular donors can match polymer acceptors, leading to low power conversion efficiency (PCE) of MD/PA-type OSCs. In this work, we studied the effect of terminal groups of small molecular donors on the optoelectronic properties and OSC device performance of MD/PA-type OSCs. We select a benzodithiophene unit bearing carbazolyl substituents as the core, terthiophene as the bridging unit, and electron-withdrawing methyl 2-cyanoacetate, 3-ethylrhodanine, and 2H-indene-1,3-dione as the terminal groups to develop three small-molecule donors. With the increase of the electron-withdrawing capability of the terminal groups, the small molecular donors exhibit redshifted absorption spectra and downshifted LUMO levels. Among the three small-molecule donors, the one with 3-ethylrhodanine terminal group exhibits the best photovoltaic performance with the PCE of 8.0% in MD/PA-type OSCs. This work provides important guidelines for the design of small-molecule donors for MD/PA-type OSC applications.

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“…BTEC‐1F shows two strong exothermic peaks at 148.3 and 209.2 °C, implying the formation of two crystalline phase . By contrast, a broad and weak exothermic peak at 210.6 °C is recorded in BTEC‐2F, indicating significantly decreased crystallinity . As a result, BTEC‐2F is proved to have a low crystallization propensity, but with intimate molecular stacking, which are beneficial for improving the phase‐separated morphology and enhancing the charge transport, separately.…”

Section: Introductionmentioning

confidence: 98%

13.34 % Efficiency Non‐Fullerene All‐Small‐Molecule Organic Solar Cells Enabled by Modulating the Crystallinity of Donors via a Fluorination Strategy

Xie

Peng

et al. 2020

Angewandte Chemie

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Non-fullerene all-small-molecule organic solar cells (NFSM-OSCs) have shown potential as OSCs,o wing to their high purity,easy synthesis and good reproducibility.However, challenges in the modulation of phase separation morphology have limited their development. Herein, two novel small molecular donors,B TEC-1F and BTEC-2F,d erived from the small molecule DCAO3TBDTT,are synthesized. Using Y6 as the acceptor,d evices based on non-fluorinated DCAO3TBDTT showed an open circuit voltage (V oc )o f 0.804 Vand ap ower conversion efficiency (PCE) of 10.64 %. Mono-fluorinated BTEC-1F showed an increased V oc of 0.870 Va nd aP CE of 11.33 %. The fill factor (FF) of difluorinated BTEC-2F-based NFSM-OSC was improved to 72.35 %r esulting in aP CE of 13.34 %, whichi sh igher than that of BTEC-1F (61.35 %) and DCAO3TBDTT (60.95 %).To our knowledge,t his is the highest PCE for NFSM-OSCs. BTEC-2F had amore compact molecular stackingand alower crystallinity which enhanced phase separation and carrier transport.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Efficient and thermally stable organic solar cells based on small molecule donor and polymer acceptor

Cited by 115 publications

References 51 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

Small-Molecule Donor/Polymer Acceptor Type Organic Solar Cells: Effect of Terminal Groups of Small-Molecule Donors

13.34 % Efficiency Non‐Fullerene All‐Small‐Molecule Organic Solar Cells Enabled by Modulating the Crystallinity of Donors via a Fluorination Strategy

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