Footprints of scanning probe microscopy on halide perovskites.

Scanning probe microscopy (SPM) and advanced atomic force microscopy (AFM) have become pivotal for nanoscale elucidation of the structural, optoelectronic and photovoltaic properties of halide perovskite single crystals and polycrystalline films, both under and conditions. These techniques reveal detailed information about film topography, compositional mapping, charge distribution, near-field electrical behaviors, cation-lattice interactions, ion dynamics, piezoelectric characteristics, mechanical durability, thermal conductivity, and magnetic properties of doped perovskite lattices. This article outlines the advancements in SPM techniques that deepen our understanding of the optoelectronic and photovoltaic performances of halide perovskites.

Visible-Light Photodetection by Zero-Dimensional Hybrid Indium-Halide with Minimal Structural Distortion and Reduced Band Gap.

Perovskite-inspired zero-dimensional (0D) hybrid halides exhibit impressive light emission properties; however, their potential in photovoltaics is hindered by the absence of interconnection between the inorganic polyhedra, leading to acute radiative recombination and insufficient charge separation. We demonstrate that incorporating closely-spaced dissimilar polyhedral units with minimal structural distortion leads to a remarkable enhancement in visible-light photodetection capability. We designed 0D CHNInBr (HIB) with a tetragonal crystal system, replacing the Cs of CsInBr.

CIsense: an automated framework for early screening of cerebral infarction using PPG sensor data.

A cerebral infarction (CI), often known as a stroke, is a cognitive impairment in which a group of brain cells perishes from a lack of blood supply. The early prediction and evaluation of this problem are essential to avoid atrial fibrillation, heart valve disease, and other cardiac disorders. Different clinical strategies like Computerized tomography (CT) scans, Magnetic resonance imaging (MRI), and Carotid (ka-ROT-id) ultrasound are available to diagnose this problem.

Transition from Dion-Jacobson hybrid layered double perovskites to 1D perovskites for ultraviolet to visible photodetection.

New perovskite phases having diverse optoelectronic properties are the need of the hour. We present five variations of RAgM(iii)X, where R = NHCHNH (4N4) or NHCHNH (6N6); M(iii) = Bi or Sb; and X = Br or I, by tuning the composition of (4N4)AgBiBr, a structurally rich hybrid layered double perovskite (HLDP). (4N4)AgBiBr, (4N4)AgSbBr, and (6N6)AgBiBr crystallize as Dion-Jacobson (DJ) HLDPs, whereas 1D (6N6)SbBr, (4N4)-BiI and (4N4)-SbI have -connected chains by corner-shared octahedra.

Multimodal Biofilm Inactivation Using a Photocatalytic Bismuth Perovskite-TiO-Ru(II)polypyridyl-Based Multisite Heterojunction.

Infectious bacterial biofilms are recalcitrant to most antibiotics compared to their planktonic version, and the lack of appropriate therapeutic strategies for mitigating them poses a serious threat to clinical treatment. A ternary heterojunction material derived from a Bi-based perovskite-TiO hybrid and a [Ru(2,2'-bpy)(4,4'-dicarboxy-2,2'-bpy)] (2,2'-bpy, 2,2'-bipyridyl) as a photosensitizer (RuPS) is developed. This hybrid material is found to be capable of generating reactive oxygen species (ROS)/reactive nitrogen species (RNS) upon solar light irradiation.

Exploiting moving slope features of PPG derivatives for estimation of mean arterial pressure.

Monitoring Mean Arterial Pressure (MAP) helps calculate the arteries' flow, resistance, and pressure. It allows doctors to check how well the blood flows through our body and reaches all major organs. Photoplethysmogram technology is gaining momentum and popularity in smart wearable devices to monitor cuff-less blood pressure (BP).

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield.

Semiconductor nanostructures with near-unity photoluminescence quantum yields (PLQYs) are imperative for light-emitting diodes and display devices. A PLQY of 99.7 ± 0.

Energy-Based DCT Approach for PPG Compression.

With the rapid development of communications, information technology, and Internet of Things (IoT), photoplethysmography (PPG) has achieved prevalence in telemedicine and remote health monitoring using wearable devices. As these devices are resource-constrained, efficient compression techniques are necessary for optimal storage and power consumption management with sustained clinical morphology of PPG signal. This work presents a new approach for PPG compression based on the energy of discrete cosine transform (DCT).

Modulating Resonance Energy Transfer with Supramolecular Control in a Layered Hybrid Perovskite and Chromium Photosensitizer Assembly.

Recently, the low-dimensional organic-inorganic halide perovskites (OIHP) have been exploited heavily for their favorable exciton dynamics, broad-band emission, remarkable stability, and tunable band-edge excited-state energy compared to their 3D counterparts for potential optoelectronic applications. Low-dimensional perovskites are generally good candidates for utilization as room-temperature photoluminescence (PL) materials. Further, doping divalent transition metals like Mn into OIHP is expected to introduce a T-A-based low-energy luminescence emission around 600 nm; an optical property that is favorable for biomedical optoelectronics.