Guest-oriented non-fullerene acceptors for ternary organic solar cells with over 16.0% and 22.7% efficiencies under one-sun and indoor light

Cho, Yongjoon; Kumari, Tanya; Jeong, Seonghun; Lee, Sang Myeon; Jeong, Mingyu; Lee, Byongkyu; Oh, Jiyeon; Zhang, Youdi; Huang, Bin; Chen, Lie; Yang, Changduk

doi:10.1016/j.nanoen.2020.104896

Cited by 79 publications

(75 citation statements)

References 58 publications

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“…Dark and bright regions in TEM images individually represent acceptor and donor domain due to the distinct electron density. [ 56,57 ] Relatively large dark bright regions can be observed from TEM image of the PM6:BTP‐BO‐4F blend film, indicating large phase separation with insufficient donor/acceptor interface for charge separation. No obvious regions can be clearly discriminated from TEM image of PM6:Y6‐1O blend films, and the rather slender phase separation is detrimental to charge transport in the corresponding active layers.…”

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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“…The addition of NFA Y-Th2 was found to broaden the absorption in visible light, adjust the energy level alignment between donor and acceptor and optimise the blend compatibility, allowing efficient chargecarrier transport in the active layer. 34 Moreover, a quaternary OPV (Q-OPV) blend system comprising two polymer donors and two small molecule acceptors was demonstrated by Nam et al 35 Compared to the reference binary OPV system, this Q-OPV system has advantages of improved charge transfer processes from the donors to acceptors, increased R sh and V oc values and well-aligned energy levels of the donors and acceptors. It was further found that higher R sh can be achieved in thicker Q-OPV devices, resulting in increased FF and J sc and thereby enhanced PCE with increasing the active layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Indoor application of emerging photovoltaics—progress, challenges and perspectives

et al. 2020

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“…With extensive efforts by many research groups, PCEs of the nonfullerene PSCs have far exceeded those of state‐of‐the‐art fullerene‐based solar cells by now. [ 7–13 ]…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Photovoltaic Performance of Ladder‐Type Heteroheptacene‐based Nonfullerene Acceptors by Incorporating Halogen Atoms on Their Ending Groups

Wan

Cai

et al. 2021

Adv Funct Materials

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Ending group halogenation is an effective strategy for modulating the energy levels, bandgaps, and intermolecular interactions of nonfullerene acceptors. Understanding the influence of different halogen atoms on the acceptor properties is of great importance for designing high‐performance nonfullerene acceptors. Here, three acceptor–donor–acceptor (A‐D‐A) type nonfullerene acceptors (M5, M6, and M7), which are constructed by using a ladder‐type heteroheptacene core without the traditional sp3 carbon‐bonded side chains as the electron‐rich core, and 2‐(3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene)malononitrile without or with halogen atoms as the ending groups. The nonfullerene acceptors with chlorinated (M6) and brominated (M7) ending groups exhibit broadened absorption spectra, down‐shifted energy levels, and enhanced molecular ordering compared to the counterpart without any halogenated ending groups (M5). Among the nonfullerene acceptors, M6 has the strongest intermolecular ππ interaction with its shortest ππ interaction distance and the longest coherent length which are beneficial for enhancing the charge transport and therefore boosting the photovoltaic performance. An excellent power conversion efficiency of 15.45% is achieved for the best‐performing polymer solar cell based on M6. These results suggest that the halogenated ending groups are essential for high‐performance heteroheptacene‐based nonfullerene acceptors considering their simultaneous enhancements in both the light‐harvesting and the charge transport.

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Guest-oriented non-fullerene acceptors for ternary organic solar cells with over 16.0% and 22.7% efficiencies under one-sun and indoor light

Cited by 79 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

Indoor application of emerging photovoltaics—progress, challenges and perspectives

Enhancing the Photovoltaic Performance of Ladder‐Type Heteroheptacene‐based Nonfullerene Acceptors by Incorporating Halogen Atoms on Their Ending Groups

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