Multiple Roles of a Non-fullerene Acceptor Contribute Synergistically for High-Efficiency Ternary Organic Photovoltaics

Xiao, Liangang; He, Bo; Hu, Qin; Maserati, Lorenzo; Zhao, Yun; Yang, Bin; Kolaczkowski, Matthew A.; Anderson, Christopher L.; Borys, Nicholas J.; Klivansky, Liana M.; Chen, Teresa L.; Schwartzberg, Adam; Russell, Thomas P.; Cao, Yong; Peng, Xiaobin; Liu, Yi

doi:10.1016/j.joule.2018.08.002

Cited by 87 publications

(56 citation statements)

References 67 publications

(56 reference statements)

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“…The third component was used as morphology regulator to optimize phase separation for efficient exciton dissociation and charge transport in ternary active layers [19][20][21]. The exciton utilization efficiency can be improved through the additional channels of intermolecular energy/charge transfer [22][23][24]. The highest occupied molecular orbital (HOMO) level and the lowest unoccupied molecular orbital (LUMO) level of the third component are vital parameters to form efficient charge transport channels in ternary active layers with two donors or acceptors, respectively.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…PL spectra were carried out to analyze the influence of the PQDs on the electronic properties and exciton separation behaviors of the active layer. Interestingly, in the blend films based on PTB7‐Th:PQDs (Figure 4b), the PL intensity of PTB7‐Th is gradually enhanced with increasing content of PQDs, due to fluorescence resonance energy transfer (FRET) effect, [ 51 ] since PL emission peak of the PQDs is located exactly at the absorption wavelength range of PTB7‐Th (Figure S7a, Supporting Information). Due to the proper alignment of the energy levels of PQDs and PTB7‐Th (Figure 4a), there is a possibility of charge transfer between PQDs and PTB7‐Th, but FRET is dominant.…”

Section: Figurementioning

confidence: 99%

High‐Efficiency Perovskite Quantum Dot Hybrid Nonfullerene Organic Solar Cells with Near‐Zero Driving Force

et al. 2020

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To take advantages of the intense absorption and fluorescence, high charge mobility, and high dielectric constant of CsPbI3 perovskite quantum dots (PQDs), PQD hybrid nonfullerene organic solar cells (OSCs) are fabricated. Addition of PQDs leads to simultaneous enhancement of open‐circuit voltage (VOC), short‐circuit current density (JSC), and fill factor (FF); power conversion efficiencies are boosted from 11.6% to 13.2% for PTB7‐Th:FOIC blend and from 15.4% to 16.6% for PM6:Y6 blend. Incorporation of PQDs dramatically increases the energy of the charge transfer state, resulting in near‐zero driving force and improved VOC. Interestingly, at near‐zero driving force, the PQD hybrid OSCs show more efficient charge generation than the control device without PQDs, contributing to enhanced JSC, due to the formation of cascade band structure and increased molecular ordering. The strong fluorescence of the PQDs enhances the external quantum efficiency of the electroluminescence of the active layer, which can reduce nonradiative recombination voltage loss. The high dielectric constant of the PQDs screens the Coulombic interactions and reduces charge recombination, which is beneficial for increased FF. This work may open up wide applicability of perovskite quantum dots and an avenue toward high‐performance nonfullerene solar cells.

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“…However, the applications of tandem organic solar cells (OSCs) are limited due to the difficulties in device fabrication and engineering . An interesting alternative to tandem OSCs are ternary solar cells, which combine the easy processing of binary OSCs with an improvement in the efficiency involving a trade‐off between open‐circuit voltage ( V oc ) and J sc . Such systems have given enhanced PCEs up to 12.2% together with improved photocurrent density, open‐circuit voltage, and fill factor (FF).…”

Section: Introductionmentioning

confidence: 99%

Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%

et al. 2020

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A new near‐IR absorbing nonfullerene acceptor (NFA), MPU4, is synthesized in three steps from an accessible selenophene–diketopyrrolopyrrole and rhodanine. The high planarity of the molecule and the extended conjugation determine that the new NFA presents a high optical absorption coefficient and a narrow bandgap. In thin films, MPU4 shows broad absorption in the visible and near‐IR regions from 550 to 930 nm. When blended with a phenothiazine‐based small‐molecule (SM) donor, SM1, the resulting additive‐free binary organic solar cell (OSC) exhibits an efficiency of 8.96% with a high open‐circuit voltage (Voc) of 0.99 V and a short‐circuit current (Jsc) of 14.91 mA cm−2 with a remarkably low energy loss (Eloss) of 0.42 eV. This efficiency is significantly higher (24%) than that achieved with an analogous device with a thiophene‐containing NFA (MPU1, 7.22%) instead of MPU4. Importantly, ternary solar cells prepared with SM1 as the donor and MPU4 and PC71BM as acceptors afford, after solvent vapor annealing, an efficiency of 10.04% with a Voc of 0.92 V, Jsc of 16.32 mA cm−2, fill factor of 0.67, and Eloss of 0.49 eV. These results demonstrate the advantages of using selenophene instead of thiophene in SM OSCs.

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Multiple Roles of a Non-fullerene Acceptor Contribute Synergistically for High-Efficiency Ternary Organic Photovoltaics

Cited by 87 publications

References 67 publications

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

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

High‐Efficiency Perovskite Quantum Dot Hybrid Nonfullerene Organic Solar Cells with Near‐Zero Driving Force

Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%

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