Non-fullerene acceptors for large-open-circuit-voltage and high-efficiency organic solar cells

Yang, Bin; Li, Junchi; Wu, Chuanguang; Zhang, Hao; Pan, Anlian; Chen, Jianghua

doi:10.1016/j.mtnano.2018.04.005

Cited by 9 publications

(8 citation statements)

References 132 publications

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“…Organic solar cells (OSCs) employing n-type, nonfullerene acceptors (NFAs) have developed quickly in the past five years and have received significant attention and research interest. − The tunable absorption spectrum and energy levels via dedicated chemical structure design realize efficient photon to electron conversion of NFA-based OSCs. − The maximum achievable power conversion efficiency (PCE) of NFA-based OSCs based on a single junction bulk heterojunction has achieved over 18% now, with tandem NFA-based OSCs achieving 17.3% efficiency …”

Section: Introductionmentioning

confidence: 99%

Modulation of J-Aggregation of Nonfullerene Acceptors toward Near-Infrared Absorption and Enhanced Efficiency

Zhang

Wang

et al. 2020

Macromolecules

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The molecular aggregation of nonfullerene acceptors (NFA) can significantly affect the light absorption, charge generation, and power conversion efficiency (PCE) of organic solar cells (OSCs). In this work, we demonstrate the regulation of J-aggregation of COi8DFIC NFA toward near-infrared absorption via solvent additives 1,8diiodooctane (DIO), diphenyl ether (DPE), and 1-chloronaphthalene (CN). Molecular dynamics simulations reveal preferential interaction of DIO with the alkyl side chains of COi8DFIC, endowing side-chains with the flexibility to adjust conformations to promote the formation of "Ato-D" type J-aggregation among the COi8DFIC backbone, resulting in a significant red-shift of absorbance toward the near-infrared region. The enhanced J-aggregation via π−π stacking, evidenced by grazing-incidence wide-angle X-ray scattering, constructs threedimensional charge transport channels at the molecular level to facilitate charge transport. The presence of 0.5 vol % DIO molecules, which is most effective among all three additives, boosts the maximum achievable PCE of CF cast PTB7-Th:COi8DFIC OSCs from 8.5% to 12.9%. Our results provide a new concept to enhance the efficiency of OSCs via dedicated control of molecular aggregations of nonfullerene acceptors.

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Section: Introductionmentioning

confidence: 99%

Modulation of J-Aggregation of Nonfullerene Acceptors toward Near-Infrared Absorption and Enhanced Efficiency

Zhang

Wang

et al. 2020

Macromolecules

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“…There are several possible explanations for this observation, such as specific molecular arrangements at the organic/organic or organic/inorganic interface which can cause a considerable shift in HOMO/LUMO energies or vacuum level . This aspect will be studied in detail and reported elsewhere in due course; yet, it would be worth mentioning at this point that high V OC (or small voltage loss) is one of the benefits associated with many NFAs, and the BP derivatives may hold the same advantage.…”

Section: Resultsmentioning

confidence: 98%

Orbital-Energy Modulation of Tetrabenzoporphyrin-Derived Non-Fullerene Acceptors for Improved Open-Circuit Voltage in Organic Solar Cells

et al. 2019

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Tetrabenzoporphyrin (BP) holds attractive characteristics for optoelectronic applications, such as the large π-conjugated framework and high photoabsorption capability. However, its use in organic solar cells (OSCs) has been limited because of the extremely low solubility that hampers direct solution processing and also the high frontier-orbital energies that lead to low open-circuit voltage (V OC ). Herein, we examine BP derivatives equipped with multiple strongly electron-withdrawing groups for photovoltaic applications. The derivatives are generated in thin films through a thermal precursor approach, wherein the corresponding bicyclo[2.2.2]octadiene-fused porphyrin derivatives are solution-cast, and then annealed to carry out the in situ retro-Diels−Alder reaction. The frontier-orbital energies of the resulting derivatives are effectively stabilized as compared to pristine BP to such a degree that they afford high V OC of up to 0.94 V when used as a donor or can even work as a new class of nonfullerene acceptor in OSCs. Single-crystal X-ray diffraction analyses demonstrate that the conformation of the BP framework largely varies from being near planar to highly curved depending on its substituents. The morphology of polymer:BP-derivative bulk-heterojunction films prepared by the thermal precursor approach also varies between the BP derivatives. These results can greatly extend the scope of both molecular design and morphology control for utilization of the BP chromophore toward achieving viable organic optoelectronic devices.

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“…C 60 and PC 60 BM) films thicker than 20 nm still yield remarkable photocurrents in fullerene-based Schottky-junction photovoltaic cells . Recently, a new class of low-band gap fused-ring non-fullerene acceptors, as an important alternative to traditional fullerene and its derivatives, have revolutionized organic photovoltaics with the power conversion efficiency rapidly increasing to near 18%. − Such high performance results from their large dielectric constant (ε = ∼5) and small exciton binding energy ( E b = 0.3–0.4 eV), − which allow to make relatively thick films in PHJ photodetectors. More importantly, non-fullerene acceptors have versatile structural tunability and distinct oscillating absorption characteristics.…”

Section: Introductionmentioning

confidence: 99%

Planar Heterojunction Organic Photodetectors Based on Fullerene and Non-fullerene Acceptor Bilayers for a Tunable Spectral Response

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Planar heterojunction (PHJ) organic photodetectors are potentially more stable than traditional bulk heterojunction counterparts because of the absence of uncontrolled phase separation in the donor and acceptor binary blend system. This work reports a new class of PHJ organic photodetectors based on the medium-band gap fullerene C 60 and low-band gap fused-ring non-fullerene acceptor ID-MeIC bilayer structure, which allows a wide range of spectral response tuning across the UV−visible−near-infrared (UV− vis−NIR) region by tailoring individual layer thickness. The C 60 layer not only increases the external quantum efficiency at 745 nm by 57% but also reduces dark currents by two orders of magnitude. More importantly, the p-type poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzi] is found to be the key compound to conduct the layer-by-layer fabrication as combined with n-type ID-MeIC for higher charge extraction efficiency. In light of the above information, PHJ organic photodetectors exhibited a specific detectivity of 6.5 × 10 10 Jones to detect NIR light at 745 nm under −0.1 V. The linear dynamic range was estimated to be 80 dB. This work has demonstrated a feasible approach to develop a PHJ architecture with tunable spectral response in the UV−vis−NIR range toward long-term stable organic photodetectors for potential applications in flexible and wearable biomedical sensors.

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Non-fullerene acceptors for large-open-circuit-voltage and high-efficiency organic solar cells

Cited by 9 publications

References 132 publications

Modulation of J-Aggregation of Nonfullerene Acceptors toward Near-Infrared Absorption and Enhanced Efficiency

Modulation of J-Aggregation of Nonfullerene Acceptors toward Near-Infrared Absorption and Enhanced Efficiency

Orbital-Energy Modulation of Tetrabenzoporphyrin-Derived Non-Fullerene Acceptors for Improved Open-Circuit Voltage in Organic Solar Cells

Planar Heterojunction Organic Photodetectors Based on Fullerene and Non-fullerene Acceptor Bilayers for a Tunable Spectral Response

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