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Organic transistor nonvolatile memory with an integrated molecular floating-gate/tunneling layer
摘要： Floating-gate based organic ?eld-effect transistor (FG-OFET) nonvolatile memories (NVMs) are demonstrated based on an integrated molecular ?oating-gate/tunneling layer, in which small molecular fullerene (C60) acting as the ?oating-gate and long-chain alkane molecule tetratetracontane acting as the tunneling layer are synchronously prepared by vacuum thermal evaporation. The effects of the thickness and the component of the integrated ?oating-gate/tunneling layer on the performances of memory are investigated. As a result, a high performance FG-OFET NVM is achieved, with a large memory window of 8.0 V on average, stable retention capability over 10 years, and reliable switching endurance over 100 cycles at the programming/erasing voltages of 640 V, at an optimized condition.
关键词： organic transistor,nonvolatile memory,fullerene,tunneling layer,molecular floating-gate,tetratetracontane
更新于2025-09-04 15:30:14
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End-cap Group Engineering of a Small Molecule Non-Fullerene Acceptor: The Influence of Benzothiophene Dioxide
摘要： In this study, a sulfonyl-containing end-capping moiety, benzothiophene dioxide, was selected to prepare the nonfullerene acceptor ITBC. ITBC has an acceptor?donor?acceptor (A-D-A) structure, with indacenodithieno[3,2-b]thiophene (IDTT) as the electron-rich core moiety. The strong electron-withdrawing sulfonyl acceptor units leads to extended UV?vis absorption into the near-IR region and relatively low frontier molecular orbital energy levels (LUMO/HOMO: ?4.13 eV/?5.61 eV) with a narrow bandgap of 1.48 eV. These values compare favorably to the well-studied small molecule acceptor 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end-capped indacenodithieno[3,2-b]thiophene (ITIC). A power conversion e?ciency of 4.17% was achieved by fabricating organic solar cells with the ?uorinated conjugated polymer FTAZ as the donor and ITBC as the acceptor. These results indicate that benzothiophene dioxide is a novel electron-withdrawing end-capping unit for ITBC, and can be used as an electron acceptor for organic solar cells.
关键词： fused conjugated system,non-fullerene acceptor,e?cient photovoltaics,benzothiophene dioxide,organic solar cells
更新于2025-09-04 15:30:14
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Fullerenes and Relative Materials - Properties and Applications || How Important is Metal-Carbon Back-Bonding for the Stability of Fullerene-Transition Metal Complexes? Role of Cage Sizes, Encapsulated Ions and Metal Ligands
摘要： A density functional study of {η2-(X@Cn)}ML2 complexes with various cage sizes (C60, C70, C76, C84, C90, C96), encapsulated ions (X = F?, 0, Li+) and metal fragments (M = Pt, Pd) is performed, using M06/LANL2DZ levels of theory. The importance of π back-bonding to the thermodynamic stability of fullerene-transition metal complexes ({η2-(X@Cn)}ML2) and the effect of encapsulated ions, metal fragments and cage sizes on the π back-bonding are determined in this study. The theoretical computations suggest that π back-bonding plays an essential role in the formation of fullerene-transition metal complexes. The theoretical evidence also suggests that there is no linear correlation between cage sizes and π back-bonding, but the encapsulated Li+ ion enhances π back-bonding and F? ion results in its deterioration. These computations also show that a platinum center produces stronger π back-bonding than a palladium center. It is hoped that the conclusions that are provided by this study can be used in the design, synthesis and growth of novel fullerene-transition complexes.
关键词： π back-bonding,fullerene-transition metal complex,encapsulated ions,metal fragments and cage sizes
更新于2025-09-04 15:30:14
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Ladder‐Type Nonacyclic Arene Bis(thieno[3,2‐b]thieno)cyclopentafluorene as A Promising Building Block for Non‐Fullerene Acceptor
摘要： A ladder-type nonacyclic arene (bis(thieno[3,2-b]thieno)cyclopentafluorene (BTTF)) has been designed and synthesized through fusing thienothiophenes with the fluorene core from the synthon of dimethyl 9,9-dioctyl-2,7-bis(thieno[3,2-b]thiophen-2-yl)fluorene-3,6-dicarboxylate. With BTTF as the central donor unit, a novel acceptor-donor-acceptor (A-D-A) type non-fullerene small molecule (BTTFIC) was prepared with 1,1-dicyanomethylene-3-indanones (IC) as the peripheral acceptor units. The energy level of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of BTTFIC locate at -5.56 and -3.95 eV, respectively, presenting a low optical band gap of 1.58 eV. Encouragingly, polymer solar cells based on the blends of BTTFIC with both the representative wide and low band gap polymer donors (PBDB-T, 1.82 eV. PTB7-Th, 1.58 eV) offer power conversion efficiencies over 8% (8.78 ± 0.18% for PBDB-T:BTTFIC and 8.18 ± 0.29% for PTB7-Th:BTTFIC). These results highlight the advantage of ladder-type BTTF on the preparation of nonfullerene acceptors with extended conjugated backbones.
关键词： Ladder-type Arene,Non-fullerene Acceptor,Bulk heterojunction,Polymer Solar Cells,Polycyclic Aromatics
更新于2025-09-04 15:30:14
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Spongy Nanostructures
摘要： Spongy structures are hollow-containing materials, encountered in natural or synthesized zeolites, spongy carbon, etc. The design and topological study of some hypothetical spongy nanostructures is presented in terms of map operations and genus calculation of their associated graphs, respectively. Among the discussed structures one remarks some novel spongy polyhedra that can evolve with 1-periodicity or radially, to provide multi-shell cages. Filling the space inside such complex nanostructures can be achieved by small fullerenes that self-arrange in aggregates with a well-defined geometry, of which energy trends to a minimal value. The way of space filling varies function of the dimension and shape of composing small fullerenes. An attempt of building and stability evaluating of several fullerene aggregates was made. The calculations were made at the HF, DFT and DFTB level of theory. The design of nanostructures was performed by our original software packages CVNET and Nano Studio.
关键词： HF,Fullerene,DFTB,DFT,Spongy Cage,Genus
更新于2025-09-04 15:30:14
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PHOTONIC ANALYSIS OF SEMICONDUCTOR FIBONACCI SUPERLATTICES: PROPERTIES AND APPLICATIONS
摘要： In this paper, we theoretically study the phase treatment of re?ected waves in one-dimensional Fibonacci photonic quasicrystals composed of nano-scale fullerene and semiconductor layers. The dependence of the phase shift of re?ected waves for TE mode and TM mode on the wavelength and incident angle is calculated by using the theoretical model based on the transfer matrix method in the infrared wavelength region. In the band gaps of supposed structures, it is found that the phase shift of re?ected wave changes more slowly than within the transmission band gaps. Furthermore, the phase shift decreases with the incident angle increasing for TE mode, and increases with the incident angle increasing for TM mode. Also, for the supposed structures it is found that there is a band gap which is insensitive to the order of the Fibonacci sequence. These structures open a promising way to fabricate subwavelength tunable phase compensators, very compact wave plates and phase-sensitive interferometry for TE and TM waves.
关键词： Fibonacci photonic quasicrystals,TE mode,semiconductor layers,infrared wavelength region,fullerene,phase shift,transfer matrix method,TM mode
更新于2025-09-04 15:30:14
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Refluxed Esterification of Fullerenes Conjugated P25 TiO2 Promotes Free Radical Scavenging Capacity and Facilitates Anti-aging Potentials in Human Cells
摘要： Titanium dioxide nanomaterials have good capability to prevent human cells from damage under UV irradiation. However, some studies indicated that the nanoscale of titanium dioxide could potentially cause harmful effects such as free radicals generation under UV irradiation and thereby accelerate the progress of cell aging. Fullerenes can scavenge large amounts of free radicals due to the fact that fullerenes contain enormous amount of π electrons with low lying lowest unoccupied molecular orbital (LUMO), but its adverse properties, such as the poor solubility in water, restricted the applicability. In this study, we employed water-soluble carboxylic acid fullerenes (C60-COOH and C70-COOH) as the free radical scavenger and modify onto the surface of titanium dioxide by refluxed esterification (P25/C60-COOH or C70-COOH) technique. The conformation and properties of theses nanomaterials were characterized by techniques and equipments such as X-ray diffraction (XRD), energy dispersive spectroscopy analysis (EDS), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), high-resolution transmission electron microscopy (HRTEM), and Fourier transform infrared spectroscopy (FT-IR). We also introduced methylene blue (MB) and rhodamine B (Rh B) as indicator to evaluate and demonstrate the scavenging capacity of these nanomaterials. Moreover, we examined the biocompatibility and UV protection capacity of our P25/fullerene composites in human 293T cells, and applied luciferase activity assay to investigate the possible underlying cell protection mechanisms exhibited by these nanomaterials. Our data indicate that both P25/C60-COOH and P25/C70-COOH could protect human cells against UV exposure. P25/C70-COOH exhibits great anti-inflammation capacity, while as P25/C60-COOH exhibits great anti-oxidative stress and anti-DNA damage capacity. Our results suggest that most of our P25/fullerenes composite materials have the ability to reduce free radicals and exhibit high biomedical potential in anti-inflammation, anti-oxidant, and anti-aging applications.
关键词： refluxed esterification,anti-oxidative stress,UV protection,TiO2/fullerene composites,anti-inflammation
更新于2025-09-04 15:30:14