Fused ring A–DA′D–A (Y-series) non-fullerene acceptors: recent developments and design strategies for organic photovoltaics

Pachaiyappan, Murugan; Hu, Ting; Hu, Xiaotian; Chen, Yiwang

doi:10.1039/d2ta04501j

Cited by 42 publications

(26 citation statements)

References 224 publications

(214 reference statements)

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“…[8,[12][13][14] An additional and significant advantage in the optimization of the photovoltaic properties of donor: NFA blends are their relatively straightforward adjustment of the frontier energy levels and optical gaps over a wide energy range, by engineering acceptor-donor-acceptor (A-D-A) or A-DA'D-A-type (such as Y6) fused groups in their molecular backbones. [15][16][17][18] This has brought the power conversion efficiency (PCE) of the state-of-the-art NFA OSCs to over 19% in a single-junction [19][20][21][22][23][24][25] and 20% in a two-terminal tandem configuration, [26,27] respectively.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

Liu

Vandewal

2023

Advanced Materials

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“…Excitedly, the PCEs based on single junction OSCs have been more than 18% in recent years. [6][7][8][9] These achievements are mainly attributed to the development of nonfullerene small molecular acceptors (NFSMAs) [10][11][12][13][14][15] and corresponding device engineering. [16][17][18] From ITIC to Y6, many molecular design strategies of NFSMAs have been proposed to adjust the photoelectric properties of NFSMAs, and thus elevated the PCEs of OSCs.…”

Section: Introductionmentioning

confidence: 99%

“…Excitedly, the PCEs based on single junction OSCs have been more than 18% in recent years. 6–9 These achievements are mainly attributed to the development of nonfullerene small molecular acceptors (NFSMAs) 10–15 and corresponding device engineering. 16–18…”

Section: Introductionmentioning

confidence: 99%

Effect of terminal fluorine substitution of a nonfullerene small molecular acceptor on the thermal stability of organic solar cells

Zeng

Tan³

et al. 2023

New J. Chem.

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“…15 , 16 A major disadvantage of spiro-OMeTAD is the low glass transition temperature decreasing the thermal stability. 17 Many new organic HTMs have been developed in recent years 18 – 21 but the highest efficient PSCs still rely on spiro-OMeTAD.…”

Section: Introductionmentioning

confidence: 99%

Broadly Applicable Synthesis of Heteroarylated Dithieno[3,2-b:2′,3′-d]pyrroles for Advanced Organic Materials – Part 2: Hole-Transporting Materials for Perovskite Solar Cells

et al. 2022

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Functionalization of heteroarylated dithieno[3,2-b:2’,3’-d]pyrroles (DTP) by triarylamines was elaborated to result in novel hole transport materials (HTMs) for perovskite solar cells. The new HTMs showed promising photovoltaic performance with efficiencies exceeding 18%. A thorough investigation of the electronic and opto-electronic properties revealed that the main efficiency loss mechanisms are not related to the pristine HTM materials but to the suboptimal interface passivation and HTM doping. We provide an optimization strategy for those device fabrication factors, which could render these new materials a potential replacement of current state-of-the-art HTMs.

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Fused ring A–DA′D–A (Y-series) non-fullerene acceptors: recent developments and design strategies for organic photovoltaics

Abstract: In this review, we aim to explore the structure-property relationships of a library of Y-series non-fullerene acceptors (NFAs) current advances, and systematic (chemical modifications) understanding influenced that have led to...

Cited by 42 publications

References 224 publications

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

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

Effect of terminal fluorine substitution of a nonfullerene small molecular acceptor on the thermal stability of organic solar cells

Broadly Applicable Synthesis of Heteroarylated Dithieno[3,2-b:2′,3′-d]pyrroles for Advanced Organic Materials – Part 2: Hole-Transporting Materials for Perovskite Solar Cells

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