Single-crystal perovskite solar cells with a lateral structure yield an efficiency enhancement 44-fold that of polycrystalline thin films, due to the much longer carrier diffusion length. A piezoelectric effect observed in single-crystal and strain-generated grain-boundaries enable ion migration form p-i-n structure.

van der Waals layered structures, notably the transitional metal dichalcogenides (TMDs) and TMD-based heterostructures, have recently attracted immense interest due to their unique physical properties potential applications in electronics, optoelectronics, energy harvesting. Despite recent progress, it is still a challenge perform comprehensive characterizations of critical these including crystal chemical dynamics, interlayer coupling, using single characterization platform. In this study,...

Abstract Exploring the abundant resources in ocean requires underwater acoustic detectors with a high-sensitivity reception of low-frequency sound from greater distances and zero reflections. Here we address both challenges by integrating an easily deformable network metal nanoparticles hydrogel matrix for use as cavity-free microphone. Since can be densely implanted inclusions, even arranged coherent arrays, this microphone detect static loads air breezes different angles, well signals 20...

With power conversion efficiencies now reaching 24.2%, the major factor limiting efficient electricity generation using perovskite solar cells (PSCs) is their long-term stability. In particular, PSCs have demonstrated rapid degradation under illumination, driving mechanism of which yet to be understood. It shown that elevated device temperature coupled with excess charge carriers due constant illumination dominant force in encapsulated illumination. Cooling 20 °C and operating at maximum...

The ability to design and enhance the nonlinear optical responses in two-dimensional (2D) transition-metal dichalcogenides (TMDCs) is both of fundamental interest highly desirable for developing TMDC-based applications, such as convertors modulators. Here, we report first time a strong anisotropic enhancement second-harmonic generation (SHG) monolayer molybdenum disulfide (MoS2) by integrating with one-dimensional (1D) titanium dioxide nanowires (NWs). SHG signal from MoS2/NW hybrid...

Abstract While grain boundaries (GBs) in conventional inorganic semiconductors are frequently considered as detrimental for photogenerated carrier transport, their exact role remains obscure the emerging hybrid perovskite semiconductors. A primary challenge GB-property investigations is that experimentally they need to be performed at top surface, which not only insensitive depth-dependent inhomogeneities but also could susceptible topographic artifacts. Accordingly, we have developed a...

We exploit scanning probe controlled domain patterning in a ferroelectric top layer to induce nonvolatile modulation of the conduction characteristic monolayer MoS$_2$ between transistor and junction state. In presence wall, exhibits rectified I-V that is well described by thermionic emission model. The induced Schottky barrier height varies from 0.38 eV 0.57 tunabe SiO$_2$ global back-gate, while tuning range depends sensitively on band tail trapping states. Our work points new route...

Single-crystal transition metal dichalcogenides (TMDs) and TMD-based heterojunctions have recently attracted significant research industrial interest owing to their intriguing optical electrical properties. However, the lack of a simple, low-cost, environmentally friendly, synthetic method poor understanding growth mechanism post huge challenge implementing TMDs in practical applications. In this work, we developed novel approach for direct formation high-quality, monolayer few-layer MoS2...

Two-dimensional layered ReX2 (X = Se, S) has attracted researcher's great interest due to its unusual in-plane anisotropic optical and electrical properties potential in polarization-sensitive optoelectronic devices, while the clean, energy-saving, ecological synthesis of highly crystalline ReSe2 with controlled domains remains challenging. Here, we develop a space-confined solid-phase approach for growing high-quality two-domain 1T′-ReSe2 tunable by using pure Re powder as precursor. The...

Conventional nanoimprint lithography with expensive rigid molds is used to pattern ferroelectric polymer nanostructures on hard substrate for use in, e.g., organic electronics. The main innovation here the of inexpensive soft polycarbonate derived from recordable DVDs and reverse at low pressure, which compatible flexible substrates. This approach was implemented produce regular stripe arrays a spacing 700 nm vinylidene fluoride co trifluoroethylene copolymer polyethylene terephthalate have...

We report a more than 10-fold enhancement of the piezoelectric coefficient d33 polycrystalline CH3NH3PbI3 (MAPbI3) films when interfacing them with ferroelectric PbZr0.2Ti0.8O3 (PZT). Piezoresponse force microscopy (PFM) studies reveal [Formula: see text] values 0.3-0.4 pm/V for MAPbI3 deposited on Au, indium tin oxide, and SrTiO3 surfaces, small phase angle fluctuating at length scales smaller grain size. In sharp contrast, samples prepared epitaxial PZT films, we observe large-scale polar...

It is known that defects strongly influence the properties of two-dimensional (2D) materials. The controlled creation and removal can be utilized to tailor optical electronic responses these 2D materials for optoelectronic nanoelectronic applications. In this study, we developed an efficient approach reversibly control defect states in mechanically exfoliated graphene molybdenum disulfide (MoS2) monolayers. were created by aluminium oxide (Al2O3) plasmas removed moderate thermal annealing at...

Large area ferroelectric polymer nanopillar arrays were prepared directly on flexible substrates using soft-mold reverse nanoimprint lithography at low pressure.

Interfacing CH3NH3PbI3 (MAPbI3) with 2D van der Waals materials in lateral photodetectors can suppress the dark current and driving voltage, while interlayer charge separation also renders slower dynamics. In this work, we show that more than one order of magnitude faster photoresponse time be achieved MAPbI3/MoS2 by locally separating photocharge generation recombination through a parallel channel single-layer MAPbI3. Photocurrent (Iph) mapping reveals electron diffusion lengths about 20 μm...

A novel Mg 2 Zr 5 O 12 ‐based coating on magnesium was formed by microarc oxidation (MAO) in a K ZrF 6 ‐containing electrolyte. The structure of the examined X‐ray diffraction using grazing angle method, scanning electron microscopy, and transmission microscopy. friction wear properties MAO‐coated ‐uncoated samples were evaluated ball‐on‐disk testing system. corrosion resistance 3.5% NaCl solution investigated potentiodynamic polarization test. is relatively dense composed –ZrO –MgF inner...

The interfacial coupling between the switchable polarization and neighboring magnetic order makes ferroelectric/ferromagnetic composite structures a versatile platform to realize voltage control of anisotropy. We report nonvolatile ferroelectric field effect modulation magnetocrystalline anisotropy (MCA) in epitaxial $\mathrm{PbZ}{\mathrm{r}}_{0.2}\mathrm{T}{\mathrm{i}}_{0.8}{\mathrm{O}}_{3}$ (PZT)/$\mathrm{L}{\mathrm{a}}_{0.8}\mathrm{S}{\mathrm{r}}_{0.2}\mathrm{Mn}{\mathrm{O}}_{3}$ (LSMO)...

The low in-plane symmetry in layered 1T'-ReS$_2$ results strong band anisotropy, while its manifestation the electronic properties is challenging to resolve due lack of effective approaches for controlling local current path. In this work, we reveal giant transport anisotropy monolayer four-layer ReS$_2$ by creating directional conducting paths via nanoscale ferroelectric control. By reversing polarization a polymer top layer, induce conductivity switching ratio >1.5x10$^8$ channel at 300 K....

The ever-increasing complexity in the structure and design of functional materials systems devices necessitates new imaging approaches with 3D characterization capabilities nanoscale resolution. This Perspective provides a brief review tomographic atomic force microscopy technique its recent applications nanocharacterization energy electronic including hybrid perovskites, CdTe, ferroelectric BiFeO3, filamentary resistive memories as model systems. We also propose several challenges...

Abstract Complex oxide heterointerfaces and van der Waals heterostructures present two versatile but intrinsically different platforms for exploring emergent quantum phenomena designing new functionalities. The rich opportunity offered by the synergy between these classes of materials, however, is yet to be charted. Here, we report an unconventional nonlinear optical filtering effect resulting from interfacial polar alignment monolayer MoS 2 a neighboring ferroelectric thin film. second...

In this work, we exploit the ferroelectric-dielectric layer thickness ratio r as an effective tuning parameter to control ferroelectric polarization and transient negative capacitance (NC) state in epitaxial ${\mathrm{Pb}\mathrm{Zr}}_{0.2}{\mathrm{Ti}}_{0.8}{\mathrm{O}}_{3}/{\mathrm{Sr}\mathrm{Ti}\mathrm{O}}_{3}$ bilayer heterostructures. The remnant decreases monotonically with decreasing r, system exhibiting abrupt transition from dielectric dominated behavior at a critical ${r}_{c}$ of 8...

The electrical performance of graphene‐based devices is largely limited by substantial contact resistance at the heterodimensional graphene–metal junctions. A laser‐assisted nanowelding technique developed to reduce (G–M) and improve carrier injection in suspended graphene devices. Selective breakdown CC bonds formation structural defects are realized through laser irradiation edges within G–M regions order increase chemical reactivity graphene, facilitate bonding, and, therefore, maximize...

Abstract Self‐assembled BiFeO 3 ‐CoFe 2 O 4 (BFO‐CFO) vertically aligned nanocomposites are promising for logic, memory, and multiferroic applications, primarily due to the tunability enabled by strain engineering at prodigious epitaxial vertical interfaces. However, local investigations directly revealing functional properties in vicinity of such critical interfaces often hampered size, geometry, microstructure, concomitant experimental artifacts. Ferroelectric switching presence lateral...

We report on the fabrication of metallic, ultra-sharp atomic force microscope tips for localized nanoscale infrared (IR) spectrum measurements by using focused electron-beam-induced deposition platinum or tungsten. The tip length can be controlled changing duration time electron beam. Probes 12.0 ± 5.0 nm radius-of-curvature routinely produced with high repeatability and near-100% yield. near-field-enhancement appears stronger at extremity metallic tip, compared commercial pristine...

A Pyroelectric Scanning Microscopy system, which uses laser-induced thermal modulation for mapping the pyroelectric response, has been used to image a bipolar domain pattern in ferroelectric polymer thin film capacitor. This system achieved resolution of 660 ± 28 nm by using violet laser and high f-number microscope objective reduce optical spot size, operating at frequencies diffusion length. The results agree well with model implemented numerically finite element analysis.