Highly broadband NLO response of acceptor–donor–acceptor materials with a planar conformation

Huang, Yong-Heng; Zhou, Wenfa; Li, Xiaofang; Jiang, Li; Song, Yinglin

doi:10.1039/d0ma00918k

Cited by 14 publications

(12 citation statements)

References 42 publications

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“…A strong A-D-A character with high ESP values is found in IDIC, Y6 and IT-4F NFAs, promoting strong intermolecular interactions between the molecules consistent with smaller π-π stacking distance (d-spacing about 3.5 Å) 28,30,38 . In contrast, O-IDFBR shows a weak A-D-A character with low ESP leading to poor intermolecular packing, as expected from its twisted structure 29,39 (Supplementary Fig. 15).…”

Section: The Cte State and Nfa Quadrupole Momentmentioning

confidence: 86%

Solution-Processed Single-Component Organic Photodetectors - Strong Quadrupole Moments in Molecules Enable the State-of-the-Art Performance

Park

Labanti

Lee

et al. 2023

Preprint

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Donor-acceptor based bulk-heterojunctions (BHJ) are commonly used as the photoactive layer in organic photodetectors (OPDs) to utilize the energetic offset formed at the donor and acceptor interface for exciton dissociation. However, this strategy often complicates optimization procedures and raises the concerns over device reproducibility and stability. Herein, we demonstrate that solution-processed single-component organic semiconductors can operate as efficient OPDs. We use non-fullerene acceptors (NFAs) as the single-component photoactive layer, where the intermolecular charge transfer excitonic (CTE) states are formed within <1 ps, and efficient photocurrent generation is achieved via strong quenching of these CTE states by reverse bias. Y6 and IT-4F, prototypical NFAs, based OPDs show excellent OPD performances; low dark current density (~10-9 A cm-2), high responsivity (≥ 0.15 A W-1), high specific detectivity (> 1012 Jones) and fast photo-response time (< 10 μs), comparable to the state-of-the-art BHJ OPDs. We find these excellent single-component NFA OPD performances are strongly correlated with the high quadrupole moments of NFA molecules, which generate the energetic offset required for CTE state separation. Our work opens a new way to realize efficient OPD devices using single-component organic semiconductors via solution processing and provides the important molecular design rules required for single-component photoactive materials.

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Section: The Cte State and Nfa Quadrupole Momentmentioning

confidence: 86%

Solution-Processed Single-Component Organic Photodetectors - Strong Quadrupole Moments in Molecules Enable the State-of-the-Art Performance

Park

Labanti

Lee

et al. 2023

Preprint

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“…Additionally, owing to a highly π-conjugated system, robust ICT and greater electronic charge movement, the A-D-A kind molecules are considered to express efficient NLO characteristics. 20 The ICT behavior of molecules has been governed not only by the inherent properties of their component moieties but also by their molecular packing. 21 Therefore, the structure–property relationship or molecular architecture should be another significant factor to enriched NLO performance.…”

Section: Introductionmentioning

confidence: 99%

Enriching NLO efficacy via designing non-fullerene molecules with the modification of acceptor moieties into ICIF2F: an emerging theoretical approach

et al. 2022

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“…The performance of OSCs is controlled by multicomplicated factors, for example, photoresponse range, charge extraction and recombination, and active layer morphology; − these features are profoundly related to the structures and properties of acceptor materials. According to previous studies, NFAs with planar conformation are usually expected to produce highly efficient OSCs because of their favorable molecular packing, charge transfer, and active layer morphology. − Generally, there are two methods to promote the rigidity and planarity of molecules: , (1) joining of two neighboring moieties together by a covalent bond to extend the conjugated backbone and (2) employing heteroatoms (F, Cl, O, S, N, etc.) to introduce noncovalent conformational locks (NCLs) .…”

Section: Introductionmentioning

confidence: 99%

Isomeric Nonfullerene Acceptors: Planar Conformation Leading to a Higher Efficiency

Lang

Chen

Lai

et al. 2022

ACS Appl. Energy Mater.

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Noncovalent conformational lock (NCL) is a beneficial noncovalent intramolecular interaction that assists in maintaining the molecular planar conformation. Such a planar conformation is favorable for a shorter molecular distance and higher molecular crystallinity, further yielding a more efficient charge transfer and higher power conversion efficiency (PCE). In this contribution, a pair of isomeric small-molecular nonfullerene acceptors (THP-4F and HPT-4F) were designed and synthesized based on the central core modification. HPT-4F with a negligible dihedral angle of 0.23° showed a highly planar conformation, bathochromic absorption, higher charge mobility, suppressed charge recombination, and enhanced J sc and fill factor, leading to a PCE of 8.68%, nearly 8 times higher than 1.31% of its isomer THP-4F. This work gives a clear view of NCLs and molecular planarity for molecular design and efficient organic photovoltaic materials by comparing two structural isomers’ totally different properties.

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Highly broadband NLO response of acceptor–donor–acceptor materials with a planar conformation

Abstract: The third-order nonlinear optical properties of A-D-A structural molecule which originally used as acceptor in organic photovoltaics (OPV) devices were investigated in the form of solution and film to deeply...

Cited by 14 publications

References 42 publications

Solution-Processed Single-Component Organic Photodetectors - Strong Quadrupole Moments in Molecules Enable the State-of-the-Art Performance

Solution-Processed Single-Component Organic Photodetectors - Strong Quadrupole Moments in Molecules Enable the State-of-the-Art Performance

Enriching NLO efficacy via designing non-fullerene molecules with the modification of acceptor moieties into ICIF2F: an emerging theoretical approach

Isomeric Nonfullerene Acceptors: Planar Conformation Leading to a Higher Efficiency

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