Abstract Antimony‐based chalcogenides have emerged as promising candidates for next‐generation thin film photovoltaics. Particularly, binary Sb 2 S 3 films exhibited great potential optoelectronic applications, due to the facile and low‐cost fabrication, simple composition, decent charge transport superior stability. However, most of reported efficient solar cells are realized based on chemical bath deposition hydrothermal methods, which require large amount solution normally very...

Abstract Greater stability of low-dimensional halide perovskites as opposed to their three-dimensional counterparts, alongside high extinction coefficient and thus excellent emission properties, have made them popular candidates for optoelectronic applications. Topological edges are found in two-dimensional that show distinct electronic properties. In this work, using Kelvin Probe Force Microscopy, performed on butylammonium lead bromide (BA 2 PbBr 4 ) single crystals with optical bandgap...

Reduction of surface reflection loss is crucial for high efficiency next generation Si solar cells. Surface texturing provides a viable method to reduce over the full bandwidth. Previous studies have concentrated on simple moth-eye silicon pillar arrays protruding from surface. Using FDTD simulation methods, we undertake systematic investigation into performance benefits provided by complex semi-random photonic quasi-crystal patterning methodologies whereby air holes are etched deep cell In...

Coupling between free space components and slab waveguides is a common requirement for integrated optical devices, typically achieved by end-fire or grating coupling. Power splitting distribution requires additional components. Usually couplers are used in combination with MMI/Y-splitters to do this task. In paper, we present photonic crystal device which performs both tasks simultaneously able couple light at normal incidence near incidence. Our approach scalable large channel counts little...

We show that a planar aperiodic lattice, mimicking the appearance of sunflower, supports photonic bandgaps for weak dielectric contrast. The pattern's high orientational order and spatially uniform modal pitch yields an isotropic Fourier space. A 2D structure cylinders (=2) in air possesses wide 21% TM bandgap, versus 5.6% sixfold lattice or 14% 12-fold fractal tiling. gap frequencies imply flat bands, thus application nonlinear optics low threshold lasers, where reduced group velocity all...

Abstract In this work, we develop a fabrication process for an interdigitated back contact solar cell using BBr 3 diffusion to form the p + region and POCl n regions. We use industry standard technology computer‐aided design modelling package, Synopsys Sentaurus, optimize geometry of device doping profiles derived from electrochemical capacitance voltage measurements. Cells are fabricated ‐type float‐zone silicon substrates with emitter fraction 60%, localized surface field holes. Key...

In this paper,we propose a hybrid quantum dot (QD)/Solar cell configuration to improve the performance of IBC silicon solar cells through efficient utilisation resonant energy transfer (RET) and luminescent downshifting (LDS).

Luminescence imaging is a widely used characterization technique for silicon photovoltaics. However, the tools to acquire images typically utilize CCD array detection, which poor absorber at luminescence wavelengths. This leads smearing effect in measured image can be characterized by point spread function (PSF). If true PSF known then restored through deconvolution. Several methods exist determining particular system and different extraction techniques lead variations result, yet no studies...

Light trapping in thin silicon solar cells demands radically different fabrication approaches to standard commercial cells. Weaker optical absorption and increased sensitivity surface recombination requires light be achieved over a broader spectral range and, ideally, without texturing the absorber itself. Nano-scale structures allow strongest scattering tuned wavelengths, where oblique into is needed most. Furthermore, applying these “externally,” i.e., on well-passivated planar surface,...

Crystalline Si solar cells based on thin wafers, with thicknesses in the range of 5–50 μm, can find applications a wide markets where flexibility and bendability are important. For these cells, avoiding standard macroscopic texture is desirable to increase structural integrity. Herein, nanopatterned SiN x antireflection (AR) coating that consists 174 nm‐radius 118 nm‐high nanodisks arranged square lattice (59 nm) layer introduced. This geometry combines Fabry–Pérot AR forward scattering by...

Surface-enhanced Raman scattering (SERS) can be used to amplify signals by several orders of magnitude, utilizing Plasmon polariton (photonic and surface mode) coupling test molecules disposed on a textured metallo-dielectric surface. Previously the 'Klarite^TM' substrate consisting an inverted array square pyramidal nanostructures patterned onto Silicon has been demonstrated afford highly reproducible SERS signals. In this paper, we investigate new rectangular lattice arrangement...

Surface enhanced Raman scattering (SERS) can be used to amplify the cross-section of signals by several orders magnitude, when a mixed photon-Plasmon mode (surface Plasmon polaritons) couples molecules on nano textured metallo-dielectric substrate. In this paper we demonstrate comprehensive 3D computational model based Rigorous coupled wave analysis (RCWA) for purpose analysing propagating and localised surface polaritons supported planar SERS substrates periodic array metal coated inverted...

We present a planar waveguide based sensor capable of simultaneous surface enhanced Raman scattering (SERS)/surface plasmon resonance (SPR) sensing methodologies. The consists nanostructured area etched into low loss fabricated from silicon oxynitride. selective deposition the 25 nm thick gold film on features was applied to create SERS/SPR active sites. In this work, we adapt SPR approach, coupling light propagating along slab nano-textured underneath. shapes nanostructures, thickness, and...

A method for measuring light absorption using photothermal deflection spectroscopy (PDS) is investigated. Typical reflectance and transmittance (R & T) measurements have low spectral resolution (SR) with standard setups. It believed that PDS solve this problem because of its high sensitivity, even at a SR. However, accurate not been obtained conventional PDS. The the sample must be considered in absorptance calculations. Various measurement methods are compared novel calculation...

Waveguide grating couplers permit efficient coupling to planar waveguides, complete with relaxed alignment tolerances and the possibility of wafer scale device testing without cleaving. To date, most solutions have been implemented as 1D gratings in high index contrast waveguides (typically SOI) strengths lateral mode converters. Here, we report design optimization polymer much lower cores (n = 1.8). Basic parameters from theory are used basis for FDTD simulations scanning over etch depth...

Abstract A novel, camera‐based method for direct implied open‐circuit voltage (i V OC ) imaging via the use of a single bandpass filter (s‐BPF) is developed large‐area photovoltaic solar cells and precursors. The photoluminescence (PL) emission imaged using narrow BPF with centre energy inside high‐energy tail PL emission, utilising close‐to‐unity nearly constant absorptivity typical devices in this range. As result, exact value sample's within transmission band not required. an s‐BPF...

This paper describes experimental measurement results for photonic crystal sensor devices which have been functionalized gas sensing applications. The consists of a two dimensional etched into slab waveguide having refractive index 1.7-1.9. Test were fabricated from SiON material on silicon / dioxide platform, and also in polymer materials platform. inorganic crystals made using direct write electron-beam lithography reactive ion etching. polymeric by nano-imprint the structure as imprint...

Over the last decade, plasmonic nanoparticle arrays have been extensively studied for their light trapping potential in thin film solar cells. However, commercial use of such has limited by complex and expensive fabrication techniques as e-beam lithography. Nanosphere lithography (NSL) is a promising low-cost alternative forming regular nanoscale features. Here, we finite-difference time-domain (FDTD) simulations to determine optical enhancement due nanosphere embedded at rear complete...

Gallium lanthanum oxysulfide (GLSO) is a promising host material for observing strong upconversion emission from trivalent rare-earth ions such as erbium (Er 3+ ).Its attractive properties include high solubility due to the content of glass former, refractive index (n = 2.2 at 550nm) radiative efficiency, and low maximum phonon energy approximately 425cm -1 .Photonic crystals meanwhile can provide controlled light extraction, may be capable suppressing unwanted IR lower lying metastable...

The determination of molar masses and their distributions is crucial in polymer synthesis design. This work presents the current performance limitations diffusion-ordered spectroscopy (DOSY) on a low-field (benchtop) NMR spectrometer (at 90 MHz) as an alternative to size exclusion chromatography (SEC) for determining diffusion coefficient (DCDs) mass (MMDs). After optimization narrowly distributed homopolymers, MMDs obtained with inverse Laplace transformation (ILT) log-normal distribution...

We present a "post-mortem" procedure for analyzing degradation of fielded photovoltaic modules. use this to investigate mechanisms in silicon heterojunction (SHJ) study cell fragments cored from two modules, one operated the field decade and stored dark as control. find that both front surface passivation bulk have likely been degraded. Through comparisons spectral photoluminescence emissions, we conclude although an increase density pre-existing types radiative defects is possible, it seems...

Surface Enhanced Raman Spectroscopy (SERS) allows the intensity of scattering to be enhanced by a factor 10⁶ placing molecules within few nm rough metal surface. In this paper we continue our investigation into completely different configuration for SERS sensor platform, incorporating an optical waveguide beneath nanostructured precious coated The geometry projects Plasmon field free space, thus increasing cross section interaction between analyte and fields, thereby device...