Improving of molecular planarity via tailoring alkyl chain within the molecules to enhance memory device performance

Bo, Rongcheng; Li, Hua; Hong-zhang, Liu; Zhuang, Hao; Li, Najun; Xu, Qingfeng; Lu, Jianmei; Wang, Lihua

doi:10.1016/j.dyepig.2014.05.003

Cited by 19 publications

(8 citation statements)

References 52 publications

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“…Phenanthridine and its derivatives are well-known polycylic aromatic entities found in natural products and exhibit interesting pharmacological properties such as antitumor and antibacterial . In addition, phenanthridine and its derivatives have also found application in photoconduction, optoelectrical switches, and so on. , Among the phenanthridine derivatives the tetrahydrodibenzo( a,i )phenanthridine core attracted us due to (a) its synthetic methodology which involves one-pot synthesis and (b) tunable functionality.…”

Section: Resultsmentioning

confidence: 99%

Tetrahydrodibenzophenanthridine-Based Boron-Bridged Polycyclic Aromatic Hydrocarbons: Synthesis, Structural Diversity, and Optical Properties

Dhanunjayarao

Nayak

et al. 2019

Organometallics

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A series of B←N coordinated tetrahydrodibenzo[a,i]phenanthridine-based polycyclic aromatic hydrocarbons (PAHs) have been designed and synthesized. All of these compounds have been characterized by multinuclear NMR spectroscopy and high-resolution mass spectrometry. Compounds 1, 2, 4, and 7 have also been characterized by single-crystal X-ray diffraction analysis. Our newly synthesized compounds exhibit good luminescence quantum yields in solution and moderate quantum yields in the solid state. Furthermore, the compounds show a large Stokes shift in comparison to the well-known boron–dipyrromethene dyes.

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Section: Resultsmentioning

confidence: 99%

Tetrahydrodibenzophenanthridine-Based Boron-Bridged Polycyclic Aromatic Hydrocarbons: Synthesis, Structural Diversity, and Optical Properties

Dhanunjayarao

Nayak

et al. 2019

Organometallics

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“…Torsional disorder lowers the activation energy separating singlet exciton and polaron states and decreases interactions between proximal charges that make up excitons and polaron pairs. , Increasing regioregularity reduces backbone torsion and steric hindrance along polymer chains and reduces the number of film surface traps and kinks along strands, lengthening polymer chains . Altering both regioregularity and side-chain lengths has been shown to help maximize the planarity and conjugation length within alkyl-polymer films ,,− and modify polymer band structure to impact the energy dependence for local vs delocalized excitations along the polymer backbone. , High thermal and excitation energies promote excitons to highly delocalized states along extended regions of the polymer, which increases exciton delocalization, charge separation, and the dissociation of bound charges. ,− π-Orbital overlap between polymer strands increases hole delocalization and screening from electrons, enhancing exciton dissociation. ,,, The mobility of free charges in electrically conductive polymers is similarly microstructure-dependent, relying on π-stacking between polymers that increase their planarity and conjugation lengths within films. ,,, These results and relationships are valuable for understanding structure-dependent charge-transfer behaviors in CPECs based on a polythiophene electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Electron Transfer in Conjugated Polymer Electrolyte Complexes: Impact of Donor–Acceptor Interactions on Microstructure, Charge Separation, and Charge Recombination

Clark-Winters

Bragg

2022

J. Phys. Chem. C

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Conjugated polyelectrolyte complexes (CPECs) are an artificial light-harvesting platform formed by pairing oppositely charged conjugated polyelectrolytes in solution. We demonstrate that selective pairing of poly[3-(potassium-4-alkanoate)thiophene-2,5-diyl] (PTAK) of various regioregularity and side-chain lengths with either methyl viologen or an electrolytic naphthalene diimide electron acceptor supports different PTAK microstructures based on specific donor−acceptor stacking relationships. Alteration in microstructure is signaled by distinct signatures of excitonic coupling in steady-state absorption spectra. More ordered PTAK microstructures are obtained in CPECs formed with regioregular PTAK and when the distance between charged groups on the acceptor and PTAK matches. Photoinduced dynamics in these CPECs are characterized by sub-100-fs PTAK-to-acceptor electron transfer with polaron-pair generation in PTAK quenched in higher-order complexes. Rates of subsequent multiphasic charge recombination on picosecond-to-nanosecond timescales are determined by structural characteristics associated with specific donor− acceptor pairings and acceptor-dependent driving force for recombination, with longer-lived charge pairs observed in highly ordered CPEC microstructures. CPECs also demonstrate structure-dependent sensitivity to excitation energy and intensity; excitation energies significantly exceeding PTAK band energy increase exciton delocalization, particularly in complexes with higher structural order. The structure dependence of charge-transfer behaviors in CPECs provides insights for inducing long-range charge separation in related materials for light-harvesting applications.

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“…According to the XRD of PBD, the other peaks arise at 2 θ = 17.8° (4.98 Å), 18.8° (4.72 Å), 19.5° (4.55 Å), 21.6° (4.11 Å), 23.9° (3.72 Å), and 26° (3.42 Å), while others for the composites correspondingly exhibit at 2 θ = 18° (4.92 Å), 18.9° (4.69 Å), 19.9° (4.46 Å), 21.9° (4.06 Å), 24.1° (3.69 Å), and 26.2° (3.4 Å). These results indicate that intermolecular π-π stacking, which would facilitate charge transport through the neighboring molecules, became stronger [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

High-Performance Resistance-Switchable Multilayers of Graphene Oxide Blended with 1,3,4-Oxadiazole Acceptor Nanocomposite

2019

Micromachines

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Graphene oxide (GO) has been actively utilized in nonvolatile resistive switching random access memory (ReRAM) devices due to solution-processability, accessibility for highly scalable device fabrication for transistor-based memory, and cross-bar memory arrays. Uncontrollable oxygen functional groups of GO, however, restrict its application. To obtain stable memory performance, 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD) a that can serve as 1,3,4-oxadiazole acceptor was carefully introduced onto the GO framework. Better stability was achieved by increasing the weight ratio of the chemical component from 2:1 to 10:1 in all GO-based solutions. Particularly, rewritable nonvolatile memory characteristics were dependent on the ratio between PBD and GO. PBD:GO devices with a proportion of 10:1 w/w exhibited better memory performance, possessed a higher ON/OFF ratio (>102) at a lower switching voltage of −0.67 V, and had a long retention ability. The interaction between PBD and GO can be demonstrated by transmission electron microscope, scanning electron microscope, thermogravimetric analysis, fourier transform infrared spectra, Raman spectra, X-ray diffraction, and fluorescence spectra. The superior ReRAM properties of the multilayers of GO blended with the PBD nanocomposite are attributed to electron traps caused by the strong electron acceptors.

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Improving of molecular planarity via tailoring alkyl chain within the molecules to enhance memory device performance

Cited by 19 publications

References 52 publications

Tetrahydrodibenzophenanthridine-Based Boron-Bridged Polycyclic Aromatic Hydrocarbons: Synthesis, Structural Diversity, and Optical Properties

Tetrahydrodibenzophenanthridine-Based Boron-Bridged Polycyclic Aromatic Hydrocarbons: Synthesis, Structural Diversity, and Optical Properties

Electron Transfer in Conjugated Polymer Electrolyte Complexes: Impact of Donor–Acceptor Interactions on Microstructure, Charge Separation, and Charge Recombination

High-Performance Resistance-Switchable Multilayers of Graphene Oxide Blended with 1,3,4-Oxadiazole Acceptor Nanocomposite

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