Two compatible polymer donors contribute synergistically for ternary organic solar cells with 17.53% efficiency

An, Qiaoshi; Wang, Junwei; Gao, Jinhua; Hu, Zhenghao; Liu, Bin; Sun, Huiliang; Guo, Xugang; Zhang, Xiaoli; Zhang, Fujun

doi:10.1039/d0ee02516j

Cited by 207 publications

(135 citation statements)

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“…It is known that charge mobility is closely related to molecular packing property of blend films. [ 46,47 ] The grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) characterization was conducted to explore the influence of incorporating Y6‐1O content on molecular packing property of blend films, [ 15,16,48 ] as shown in Figure a. The corresponding out‐of‐plane (OOP) and in‐plane (IP) scattering profiles are shown in Figure 5b,c.…”

Section: Resultsmentioning

confidence: 99%

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

et al. 2021

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Efficient organic photovoltaic cells (OPVs) are fabricated using two structurally similar Y6 derivations (BTP‐BO‐4F and Y6‐1O) as acceptor and PM6 as donor. The two binary OPVs exhibit a high fill factor (FF) (>76%), the complementary short‐circuit‐current density (JSC) and open‐circuit voltage (VOC). The high FFs of binary OPVs indicate the good compatibility of corresponding materials to form efficient charge transport channels. A power conversion efficiency (PCE) of 17.59% is obtained from ternary OPVs with 15 wt% Y6‐1O in acceptors, benefiting from the simultaneously improved JSC of 26.13 mA cm−2, a VOC of 0.860 V, and an FF of 78.26%. The values of VOC of ternary OPVs can be gradually increased along with the incorporation of Y6‐1O, suggesting the preferred formation of an alloyed state between BTP‐BO‐4F and Y6‐1O due to their good compatibility. Meanwhile, the cascaded energy levels of BTP‐BO‐4F and Y6‐1O can form efficient electron transport channels in ternary active layers. The main contribution of Y6‐1O can be summarized as enhancing photon harvesting, optimizing phase separation, and adjusting molecular arrangement. The experimental results may provide new insight on developing efficient ternary OPVs by selecting two well‐compatible acceptors.

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Section: Resultsmentioning

confidence: 99%

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

et al. 2021

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“…In principle, it should be impossible for exciton to be separated between BP5T-4F and CH1007 due to insufficient driving force. [19][20]64,65] However, BP5T-4F and CH1007 show many similarities in molecular structure and can stack easily with each other, therefore, ternary OSCs might work under an alloy-like mechanism. Apart from this, the unique feature that V oc s of ternary OSCs decreases linearly with the increased CH1007 content also support this mechanism well.…”

Section: Doi: 101002/aenm202003177mentioning

confidence: 99%

Asymmetric Acceptors Enabling Organic Solar Cells to Achieve an over 17% Efficiency: Conformation Effects on Regulating Molecular Properties and Suppressing Nonradiative Energy Loss

Gao

et al. 2020

Advanced Energy Materials

130

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Y6, as a state‐of‐the‐art nonfullerene acceptor (NFA), is extensively optimized by modifying its side chains and terminal groups. However, the conformation effects on molecular properties and photovoltaic performance of Y6 and its derivatives have not yet been systematically studied. Herein, three Y6 analogs, namely, BP4T‐4F, BP5T‐4F, and ABP4T‐4F, are designed and synthesized. Owing to the asymmetric molecular design strategies, three representative molecular conformations for Y6‐type NFAs are obtained through regulating the lateral thiophene orientation of the fused core. It is found that conformation adjustment imposes comprehensive effects on the molecular properties in neat and blend films of these NFAs. As a result, organic solar cells (OSCs) fabricated with PM6:BP4T‐4F, PM6:BP5T‐4F, and PM6:ABP4T‐4F show high power conversion efficiency of 17.1%, 16.7%, and 15.2%, respectively. Interestingly, these NFAs with different conformations also show reduced energy loss (Eloss) in devices via gradually suppressed nonradiative Eloss. Moreover, by employing a selenium‐containing analog, CH1007, as the complementary third component, ternary OSCs based on PM6:BP5T‐4F:CH1007 (1:1.02:0.18) achieve a 17.2% efficiency. This work helps shed light on engineering the molecular conformation of NFAs to achieve high efficiency OSCs with reduced voltage loss.

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“…[ 12–15 ] Presently, binary blends based on a bulk‐heterojunction of a polymer donor and a NFA are still not desirable for manufacturing wearable and stretchable (portable) devices, which is in part due to the relatively poor photovoltaic properties and mechanical/morphological instability. To overcome these possible limitations of binary blends, introducing a third component [ 16,17 ] such as polymer donor, [ 18–20 ] NFA, [ 21–25 ] fullerene acceptor, [ 26–29 ] and so on [ 30,31 ] can be considered.…”

Section: Introductionmentioning

confidence: 99%

Modulation of Morphological, Mechanical, and Photovoltaic Properties of Ternary Organic Photovoltaic Blends for Optimum Operation

Peng

Jiang

Qin

et al. 2021

Advanced Energy Materials

103

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Ternary solar cells comprising both fullerene and nonfullerene acceptors have shown a rapid increase in power conversion efficiency, which holds promise in commercial applications. Despite the rapid progress, there is still a lack of fundamental understanding of the relations between microstructure and (photovoltaic/mechanical) properties in these ternary blend systems. In this work, the dependence of molecular packing, phase separation, mechanical properties, and photovoltaic performance on acceptor composition of a recently certificated ternary system is thoroughly investigated by combined scattering and microscopy characterizations. It is demonstrated that incorporating a small amount (20% by weight) PC71BM to the PM6:N3 binary blend can afford the best device efficiency and the highest ductility simultaneously. This maximum performance is due to the optimized molecular order, orientational texture, and phase separation. Additionally, increasing the amount of PC71BM results in higher elastic modulus, as probed by two distinct methods. A more crucial observation is that the elastic modulus of ternary blends can be well captured by an extended Halpin–Tsai model. This finding is expected to enable the prediction of the elastic modulus of various kinds of ternary blends that are widely used in solar cells and other electronics.

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Two compatible polymer donors contribute synergistically for ternary organic solar cells with 17.53% efficiency

Abstract: Ternary strategy has been demonstrated as a promising method to further boost the performance of organic solar cells (OSCs). Herein, an efficient polymer donor S3 was synthesized and incorporated into...

Cited by 207 publications

References 58 publications

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

Ternary Organic Photovoltaic Cells Exhibiting 17.59% Efficiency with Two Compatible Y6 Derivations as Acceptor

Asymmetric Acceptors Enabling Organic Solar Cells to Achieve an over 17% Efficiency: Conformation Effects on Regulating Molecular Properties and Suppressing Nonradiative Energy Loss

Modulation of Morphological, Mechanical, and Photovoltaic Properties of Ternary Organic Photovoltaic Blends for Optimum Operation

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