Wide-bandgap organic solar cells with a novel perylene-based non-fullerene acceptor enabling open-circuit voltages beyond 1.4 V

Hofinger, Jakob; Weber, Stefan; Mayr, Felix; Jodlbauer, Anna; Reinfelds, Matiss; Rath, Thomas; Trimmel, Gregor; Scharber, Markus C.

doi:10.1039/d1ta09752k

Cited by 22 publications

(30 citation statements)

References 52 publications

(63 reference statements)

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“…[26] A π-extended linker based on tetraoctyl-indeno[1,2-b]fluorene in combination with the D18 polymer allowed to boost the V OC to 1.4 V (with a PCE over 5 %). [27] These promising results motivated us to perform a detailed structure-property relationship study on these P-L-P systems. To that end, we have chosen the simplest aromatic linker -benzene.…”

Section: Introductionmentioning

confidence: 99%

“…With all three acceptors, efficiencies over 5 % and V OC s over 1 V could be reached (PBDB‐T as donor polymer) [26] . A π‐extended linker based on tetraoctyl‐indeno[1,2‐b]fluorene in combination with the D18 polymer allowed to boost the V OC to 1.4 V (with a PCE over 5 %) [27] . These promising results motivated us to perform a detailed structure–property relationship study on these P‐L‐P systems.…”

Section: Introductionmentioning

confidence: 99%

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Phenylene‐Bridged Perylene Monoimides as Acceptors for Organic Solar Cells: A Study on the Structure–Property Relationship

Schweda

Reinfelds

Hofinger

et al. 2022

Chemistry A European J

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A series of non‐fullerene acceptors based on perylene monoimides coupled in the peri position through phenylene linkers were synthesized via Suzuki‐coupling reactions. Various substitution patterns were investigated using density functional theory (DFT) calculations in combination with experimental data to elucidate the geometry and their optical and electrochemical properties. Further investigations of the bulk properties with grazing incidence wide angle X‐ray scattering (GIWAXS) gave insight into the stacking behavior of the acceptor thin films. Electrochemical and morphological properties correlate with the photovoltaic performance of devices with the polymeric donor PBDB‐T and a maximum efficiency of 3.17 % was reached. The study gives detailed information about structure–property relationships of perylene‐linker‐perylene compounds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phenylene‐Bridged Perylene Monoimides as Acceptors for Organic Solar Cells: A Study on the Structure–Property Relationship

Schweda

Reinfelds

Hofinger

et al. 2022

Chemistry A European J

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“…According to literature, the energy difference between the LUMOs of D/A should be more than 0.3 V for good charge separation. [14][15][16][17][18] The deeper HOMO and closer LUMO of P(BDTSi-DTffQ) compared to those of ITIC resulted in higher bimolecular recombination on photoactive layer of NFA-OSC. In contrast, the HOMO level of P(BDTSi-DTfQ) was higher than that of ITIC, and the LUMO level was situated above (⁓0.33 eV) the LUMO level of ITIC.…”

Section: Photovoltaic Properties Of the Polymersmentioning

confidence: 99%

“…[7][8][9][10][11][12][13] The open circuit voltage (V oc ) of the OSC was increased by maximizing the energy gap between the highest occupied molecular orbital (HOMO) level of the donor (polymer) and lowest unoccupied molecular orbital (LUMO) level of the acceptor (NFA). [14][15][16][17][18] However, the HOMO/LUMO levels of the donor should be positioned above the HOMO/ LUMO level of the acceptor for reduced exciton recombination. Especially, the LUMO level of the donor must be positioned by at least over 0.3 eV higher than the LUMO level of the acceptor for efficient charge dissociation at donor/ acceptor (D/A) interfaces on photoactive films.…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the LUMO level of the donor must be positioned by at least over 0.3 eV higher than the LUMO level of the acceptor for efficient charge dissociation at donor/ acceptor (D/A) interfaces on photoactive films. [14][15][16][17][18] However, the fill factor (FF) of the OSCs was influenced by carrier mobility, molecular stacking, and good interpenetrating network formations between the donor and acceptor molecules. [19][20][21][22][23] Hence, the progress of structurally new wide bandgap polymeric donors and narrow bandgap NFAs is crucial to enhancing the performance of NFA-OSCs.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photovoltaic performance for quinoxaline‐based polymeric donor via backbone engineering for non‐fullerene organic solar cells

Agneeswari

Ahn

Tamilavan

et al. 2022

Bulletin Korean Chem Soc

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Herein, we demonstrate a facile technique for transforming a low‐energy‐converting quinoxaline‐based polymer into an efficient polymeric donor for non‐fullerene acceptor‐based organic solar cells (NFA‐OSCs). Alternating copolymers, namely P(BDTSi‐DTfQ), incorporating electron‐rich 4,8‐bis(triisopropylsilylethynyl)‐benzo[1,2‐b:4,5‐′]dithiophene (BDTSi) and electron‐deficient 2,3‐didodecyl‐6‐fluoro‐5,8‐di(thiophen‐2‐yl)quinoxaline (DTfQ) units were synthesized. The properties of P(BDTSi‐DTfQ) were thoroughly studied and briefly compared to those of the reported polymers, namely P(BDTSi‐DTffQ), made up of BDTSi and 2,3‐didodecyl‐6,7‐difluoro‐5,8‐di(thiophen‐2‐yl)quinoxaline (DTffQ) units. Polymer P(BDTSi‐DTfQ) exhibited a lower bandgap (Eg) and higher highest occupied and lowest unoccupied energy levels (HOMO and LUMO) than P(BDTSi‐DTffQ). The estimated Eg and HOMO/LUMO for P(BDTSi‐DTfQ) were 1.90 eV and −5.46 eV/−3.56 eV, respectively, and for P(BDTSi‐DTffQ) the same were 1.94 eV and −5.58 eV/−3.64 eV, respectively. Interestingly, the NFA‐OSCs made from P(BDTSi‐DTfQ) as the donor and NFA, namely ITIC, as the acceptor, gave a power conversion efficiency (PCE) of 3.68%, which is much higher than the PCE obtained (⁓0.75%) for the OSCs prepared by using the P(BDTSi‐DTffQ):ITIC blend. Noticeably, the energy levels of P(BDTSi‐DTfQ) were found to be favorable for efficient charge separation when it was blended with ITIC. This blend not only allowed a better charge separation at the donor/acceptor interfaces but also significantly lowered bimolecular recombination. The overall effect was to provide a higher PCE. However, P(BDTSi‐DTffQ) showed mismatched energy levels with ITIC resulting in a higher bimolecular recombination and lower PCE.

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Understanding and Suppressing Non‐Radiative Recombination Losses in Non‐Fullerene Organic Solar Cells

Liu

Vandewal

2023

Advanced Materials

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Organic solar cells benefit from non‐fullerene acceptors (NFA) due to their high absorption coefficients, tunable frontier energy levels, and optical gaps, as well as their relatively high luminescence quantum efficiencies as compared to fullerenes. Those merits result in high yields of charge generation at a low or negligible energetic offset at the donor/NFA heterojunction, with efficiencies over 19% achieved for single‐junction devices. Pushing this value significantly over 20% requires an increase in open‐circuit voltage, which is currently still well below the thermodynamic limit. This can only be achieved by reducing non‐radiative recombination, and hereby increasing the electroluminescence quantum efficiency of the photo‐active layer. Here, current understanding of the origin of non‐radiative decay, as well as an accurate quantification of the associated voltage losses are summarized. Promising strategies for suppressing these losses are highlighted, with focus on new material design, optimization of donor–acceptor combination, and blend morphology. This review aims at guiding researchers in their quest to find future solar harvesting donor–acceptor blends, which combine a high yield of exciton dissociation with a high yield of radiative free carrier recombination and low voltage losses, hereby closing the efficiency gap with inorganic and perovskite photovoltaics.

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Wide-bandgap organic solar cells with a novel perylene-based non-fullerene acceptor enabling open-circuit voltages beyond 1.4 V

Abstract: A perylene-based acceptor (PMI-FF-PMI), consisting of two perylene monoimide (PMI) units bridged with a dihydroindeno[1,2 b]fluorene molecule was developed as a potential non-fullerene acceptor (NFA) for organic solar cells (OSCs)....

Cited by 22 publications

References 52 publications

Phenylene‐Bridged Perylene Monoimides as Acceptors for Organic Solar Cells: A Study on the Structure–Property Relationship

Phenylene‐Bridged Perylene Monoimides as Acceptors for Organic Solar Cells: A Study on the Structure–Property Relationship

Enhanced photovoltaic performance for quinoxaline‐based polymeric donor via backbone engineering for non‐fullerene organic solar cells

Understanding and Suppressing Non‐Radiative Recombination Losses in Non‐Fullerene Organic Solar Cells

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