Spin-based properties, applications, and devices are commonly related to magnetic effects materials. Most of the development in spintronics is currently based on inorganic Despite fact that magnetoresistance effect has been observed organic materials, until now spin selectivity originated from an ferromagnetic electrode was not determined by molecules themselves. Here we show conduction through double-stranded DNA oligomers selective, demonstrating a true filter. The exceeds any known system...

We report the results of an extensive investigation metal-molecule-metal tunnel junctions based on oligophenylene dithiols (OPDs) bound to several types electrodes (M1-S-(C6H4)n-S-M2, with 1 ≤ n 4 and M1,2 = Ag, Au, Pt) examine impact molecular length (n) metal work function (Φ) junction properties. Our includes (1) measurements by scanning Kelvin probe microscopy electrode changes (ΔΦ ΦSAM - Φ) caused chemisorption OPD self-assembled monolayers (SAMs), (2) current-voltage (I-V)...

We report detailed measurements of transport and electronic properties molecular tunnel junctions based on self-assembled monolayers (SAMs) oligophenylene monothiols (OPT n, n = 1-3) dithiols (OPD Ag, Au, Pt electrodes. The were fabricated with the conducting probe atomic force microscope (CP-AFM) platform. Fitting current-voltage ( I-V) characteristics for OPT OPD to analytical single-level tunneling model allows extraction both HOMO-to-Fermi-level offset (εh) average molecule-electrode...

We report here an extensive study of transport and electronic structure molecular junctions based on alkyl thiols (CnT; n = 7, 8, 9, 10, 12) dithiols (CnDT; 10) with various lengths contacted different metal electrodes (Ag, Au, Pt). The dependence the low-bias resistance (R) contact work function indicates that is HOMO-assisted (p-type transport). Analysis current-voltage (I-V) characteristics for CnT CnDT tunnel analytical single-level model (SLM) provides both HOMO-Fermi energy offset...

Abstract The fragile bottom side of perovskite films is demonstrated to be harmful the efficiency and stability solar cells (PSCs) because carrier extraction recombination can significantly influenced by easily formed strain, voids, defects on side. Nevertheless, usually overlooked it remains a challenge directly characterize modify Herein, facile effective strategy reported stabilize via preburying cesium formate (CsFo) into SnO 2 electron transport layer (ETL). It found that synergistic...

Abstract Energy loss in perovskite grain boundaries (GBs) is a primary limitation toward high‐efficiency solar cells (PSCs). Two critical strategies to address this issue are high‐quality crystallization and passivation of GBs. However, the established methods generally carried out discretely due complicated mechanisms growth defect formation. In study, combined method proposed by introducing 3,4,5‐Trifluoroaniline iodide (TFAI) into precursor. The TFAI triggers union nano‐sized colloids...

The transport properties of molecular junctions based on alkanedithiols with three different methylene chain lengths were compared similar chains wherein every third −CH2– was replaced O or S, that is, following the general formula HS(CH2CH2X)nCH2CH2SH, where X = CH2, O, S and n 1, 2, 3. Conducting probe atomic force microscopy revealed low bias resistance increased upon substitution in order CH2 < S. This change is ascribed to observed identical trend contact resistance, Rc, whereas...

The Stark effect plays a key role in understanding why, against expectation, alkane thiols are not high-performance molecular rectifiers.

Tellurene is a recently discovered 2D material with high hole mobility and air stability, rendering it good candidate for future applications in electronics, optoelectronics, energy devices. However, the physical properties of tellurene remain poorly understood. In this paper, we report on fabrication characterization high-performance electrolyte-gated transistors (EGTs) based solution-grown flakes <30 nm thickness. Both Hall measurements resistance-temperature behavior down to 2 K are...

Laws of corresponding states known so far demonstrate that certain macroscopic systems can be described in a universal manner terms reduced quantities, which eliminate specific substance properties. To quantitatively describe real systems, all these laws contain numerical factors adjusted empirically. Here, we report law deduced analytically for charge transport via tunneling molecular junctions, validate against current–voltage measurements conducting probe atomic force microscope junctions...

A central issue in molecular electronics order to build functional devices is assess whether changes the electronic structure of isolated compounds by chemical derivatization are retained once molecules inserted into junctions. Recent theoretical studies have suggested that this not always case due occurrence pinning effects making alignment transporting levels insensitive systems. We explore here phenomenon investigating at both experimental and I/V characteristics junctions incorporating...

Experiments on n-type perylene diimide nanojunctions with different contacts at variable temperature allow discrimination between tunneling and hopping mechanisms.

Strong stochastic fluctuations witnessed as very broad resistance (R) histograms with widths comparable to or even larger than the most probable values characterize many measurements in field of molecular electronics, particularly those based on single molecule junctions at room temperature. Here we show that containing 80 oligophenylene dithiol molecules (OPDn, 1 ≤ n 4) connected parallel display small relative statistical deviations—δR/R ≈ 25% after only ∼200 independent measurements—and...

Despite numerous prior studies on molecular tunnel junctions, many important questions remain about the nature of metal–molecule contacts. Using conducting probe atomic force microscope (CP-AFM) platform, we report here an investigation electrical contact effects in junctions based oligophenylene and alkyl dithiols (OPDn, n = 1, 2, 3 CnDT, 8, 9, 10) linked via thiol anchoring groups to dissimilar Ag, Au, Pt metal electrodes. Our data reveal a peculiar effect: two interfaces "talk" each...

Abstract Tin oxide (SnO 2 ) as an electron transport layer (ETL) has garnered significant attention in planar perovskite solar cells (PSCs) for its excellent physical and chemical properties, paving commercial potential. However, drawbacks, such surface defects photocatalytic properties due to wide band gap, remain unresolved. Under ultraviolet (UV) light, SnO induces phase transitions at the interface, compromising device stability. In this study, fluorescent dopant sodium...

We report quantitative analysis of tunneling conductance in molecular junctions based on self-assembled monolayers (SAMs) oligophenylene dimethanethiols (OPDMn) which −CH2– spacers flank either side the phenylene (n = 1), biphenylene 2), and terphenylene 3) aromatic cores. The current–voltage (I–V) characteristics for OPDMn with Au Pt contacts are analyzed quantitatively a previously validated single level model (SLM) to extract key junction metrics, namely HOMO-to-Fermi-level offset, εh,...

In this paper, we report results on the electronic structure and transport properties of molecular junctions fabricated via conducting probe atomic force microscopy (CP-AFM) using self-assembled monolayers (SAMs) n-alkyl chains anchored with acetylene groups (CnA; n = 8, 9, 10, 12) Ag, Au, Pt electrodes. We found that current–voltage (I–V) characteristics CnA CP-AFM can be very accurately reproduced by same off-resonant single-level model (orSLM) successfully utilized previously for many...

Developing a clearer understanding of electron tunneling through molecules is central challenge in molecular electronics. Here we demonstrate the use mechanical stretching to distinguish orbital pathways that facilitate junctions. Our experiments employ junctions based on self-assembled monolayers (SAMs) homologous alkanethiols (C nT) and oligophenylene thiols (OPT n), which serve as prototypical examples σ-bonded π-bonded backbones, respectively. Surprisingly, conductances ( Gmolecule) for...

For sufficiently low biases, Ohm's law, the cornerstone of electricity, stating that current I and voltage V are proportional, is satisfied at biases for all known systems ranging from macroscopic conductors to nanojunctions. In this study, we predict theoretically demonstrate experimentally in single-molecule junctions fabricated with single-layer graphene as electrodes scales cube V, thereby invalidating law. The absence ohmic regime a direct consequence unique band structure graphene,...

Bound states in the continuum (BICs) are embedded radiation spectrum, which have garnered significant interest across various areas, including photonics and acoustics. In this work, by introducing rotational obstacles into acoustic resonators, we report a series of accidental BICs coupled waveguide-resonator systems. We demonstrate that general type would emerge at specific rotating angles, supported mode symmetries boundary interface between resonators attached waveguides. further presence...

This work explores the electronic states of CdTe semiconductor nanoparticles (NPs) that are immobilized on a polycrystalline Au film through an organic linker (dithiol). The HOMO and LUMO energies NPs were determined by using photoelectron spectroscopy cyclic voltammetry. results from these measurements show energy is independent nanoparticle size pinned to Fermi level, whereas changes systematically with NP. Studies different capping ligands imply dithiol ligand removes surface enhances...

We report room-temperature resistance changes of up to 30% under weak magnetic fields (0.1 T) for molecular tunnel junctions composed oligophenylene thiol molecules, 1–2 nm in length, sandwiched between gold contacts. The magnetoresistance (MR) is independent field orientation and the length molecule; it appears be an interface effect. Theoretical analysis suggests that source MR a two-carrier (two-hole) interaction at interface, resulting spin coupling tunneling hole localized Au/molecule...

A p-type doped organic layer combined with a hole-blocking has been experimentally demonstrated to serve as the charge generation unit in tandem-type light-emitting devices. The functions source of both holes and electrons. Charge separation is explained by tunneling model that reduces energy barrier for electrons generated tunnel through into one unit, while can transport other easily under operation voltage.

Magnetoelectroluminescence (MEL) of organic semiconductor has been experimentally tuned by adopting blended emitting layer consisting hole transporting material and electron material. Theory based on Hubbard model fits experimental MEL well, which reveals two findings: (1) spin scattering mixing, respectively, dominate in low-field high-field region. (2) Blended ratio, thus the mobility, determines value relative change EL a given magnetic field. Finally successful prediction about increase...