A New Nonfullerene Acceptor with Near Infrared Absorption for High Performance Ternary‐Blend Organic Solar Cells with Efficiency over 13%

Gao, Huanhuan; Sun, Yanna; Wan, Xiangjian; Ke, Xuezhi; Feng, Huanran; Kan, Bin; Li, Han; Zhang, Yamin; Li, Chenxi; Chen, Yongsheng

doi:10.1002/advs.201800307

Cited by 116 publications

(43 citation statements)

References 39 publications

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“…[29] The calculation of exciton binding energy and reorganization energy was based on the B3LYP functional and the 6-31G(d) basis set, since B3LYP is one of the most widely used functional that has previously been shown to give results of molecular orbital levels, exciton and ionic states of NFAs that agree well with the measurements. [30][31][32][33][34] For example, the measured HOMO level and lowest-energy absorption peak of IT-IC are -5.51 eV and 1.75 eV, respectively, [6] as compared to -5.49 eV and 1.76 eV calculated using B3LYP. The exciton binding and reorganization energies of NFAs calculated using B3LYP are comparable with reported previously.…”

Section: Methodsmentioning

confidence: 87%

Energy Loss in Organic Photovoltaics: Nonfullerene Versus Fullerene Acceptors

Liu

Ding

et al. 2019

Phys. Rev. Applied

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The energy loss experienced by organic photovoltaics (OPVs) is the difference between the lowest photogenerated exciton energy of donor or acceptor and the open circuit energy. It sets a fundamental limit to the open circuit voltage and hence the efficiency of OPVs. This loss can be as large as 0.7 eV for fullerene acceptors, although non-fullerene acceptors (NFAs) reduce this to 0.6 eV. Here, we systematically quantify the relationship between charge transfer energy loss (Δ ), non-radiative recombination loss, exciton binding energy, and intra-and inter-molecular electron-phonon couplings. Density functional theory and comprehensive quantum mechanical modeling is used to associate molecular volume, effective conjugation length, and the nonbonding character of molecules to these several energy losses. Nonradiative recombination in donor/NFA heterojunctions is quantified by the charge transfer state emission quantum yield, and its Frank-Condon shift. Our analytical results are consistent with measurements where Δ is varied between 0 and 0.6 eV using a variety of fullerene derivatives and thiophene-based NFAs paired with donor molecules. Molecular design rules to decrease the energy loss in OPVs derived from our analysis are provided.at the donor-acceptor HJ is: [5] .(Heterojunctions employing fullerene derivatives usually suffer from a loss of > 0.7 eV.Alternatives to fullerene acceptors have therefore been sought to reduce while extending the absorption spectrum into the infrared. The development of nonfullerene acceptors (NFAs)with acceptor-donor-acceptor (a-d-a) or perylene diimide (PDI)-based molecular motifs give freedom to tune the molecular energetics, absorption spectra and thin film morphologies through

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Section: Methodsmentioning

confidence: 87%

Energy Loss in Organic Photovoltaics: Nonfullerene Versus Fullerene Acceptors

Liu

Ding

et al. 2019

Phys. Rev. Applied

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“…Moreover, PCE >10% were also obtained having a varied active layer thickness of 50–200 nm. Recently, Chen and co‐workers exchanged the DCI in 6TIC with DFIC terminal units to get 3TT‐FIC . As expected, it showed a narrower E g opt of 1.25 eV with an absorption peak at 851 nm.…”

Section: Nfas and Various Aspects Of Freasmentioning

confidence: 68%

“…Chen and co‐workers utilized a novel FREA 3TT‐FIC , which consists of a 6T core end‐capped with DFIC terminal units . High PCE of 13.54% with exceptional J SC of 27.73 mA cm −2 was achieved using a ternary blend of PTB7‐Th: 3TT‐FIC :PC 71 BM.…”

Section: Other Aspects Of Frea Oscsmentioning

confidence: 99%

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

Small

140

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The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement from ≈2.5% in 2013 to 17.3% in 2018 in OSC performance is primarily credited to novel nonfullerene acceptors (NFA), especially fused ring electron acceptors (FREAs). FREAs offer unique advantages over FAs, like broad absorption of solar radiation, and they can be extensively chemically manipulated to tune optoelectronic and morphological properties. Herein, the current status in FREA‐based OSCs is summarized, such as design strategies for both wide and narrow bandgap FREAs for BHJ, all‐small‐molecule OSCs, semi‐transparent OSC, ternary, and tandem solar cells. The photovoltaics parameters for FREAs are summarized and discussed. The focus is on the various FREA structures and their role in optical and morphological tuning. Besides, the advantages and drawbacks of both FAs and NFAs are discussed. Finally, an outlook in the field of FREA‐OSCs for future material design and challenges ahead is provided.

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“…Organic photovoltaics (OPVs) have recently retrieved attention due to the advantages of high efficiency, potentially low cost, printability, light weight, flexibility, and so on . There are many striking advantages in OPVs but the devices faded out from the research communities because of the poor power conversion efficiency (PCE) capped below 12% for several years.…”

Section: Introductionmentioning

confidence: 99%

Vacuum‐Free, All‐Solution, and All‐Air Processed Organic Photovoltaics with over 11% Efficiency and Promoted Stability Using Layer‐by‐Layer Codoped Polymeric Electrodes

et al. 2020

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Nonfullerene organic photovoltaics (OPVs) have achieved a breakthrough in pushing the efficiency beyond 15%. Although this sheds light on OPV commercialization, the high cost associated with the scalable device fabrications remains a giant challenge. Herein, a vacuum‐free, all‐solution and all‐air processed OPV is reported that yields 11.12% efficiency with a fill factor of 0.725, due to the usages of high‐merit polymeric electrodes and modified active blends. The design principle toward the high‐merit electrodes is to induce heavy acid doping into the matrices for a raised carrier concentration and mobility, make a large removal of insulating components in the whole matrices rather than surfaces, and restrain the formation of large‐domain aggregates. A unique layer‐by‐layer doping is developed to enable the polymeric electrodes with record‐high trade‐offs between optical transmittance and electrical conductivity. Moreover, solvent vapor annealing is proposed to boost device efficiency and it has the advantages of finely adjusting the active blend morphology and raising the electron mobility. The resulting devices are highly efficient and most (≈91%) of the initial efficiency are maintained in 30 day storage. This work indicates bright future for making cost‐effective all‐solution processed OPVs in air.

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A New Nonfullerene Acceptor with Near Infrared Absorption for High Performance Ternary‐Blend Organic Solar Cells with Efficiency over 13%

Cited by 116 publications

References 39 publications

Energy Loss in Organic Photovoltaics: Nonfullerene Versus Fullerene Acceptors

Energy Loss in Organic Photovoltaics: Nonfullerene Versus Fullerene Acceptors

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Vacuum‐Free, All‐Solution, and All‐Air Processed Organic Photovoltaics with over 11% Efficiency and Promoted Stability Using Layer‐by‐Layer Codoped Polymeric Electrodes

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