Abstract Hot-carrier solar cells can overcome the Shockley-Queisser limit by harvesting excess energy from hot carriers. Inorganic semiconductor nanocrystals are considered prime candidates. However, hot-carrier is compromised competitive relaxation pathways (for example, intraband Auger process and defects) that overwhelm their phonon bottlenecks. Here we show colloidal halide perovskite transcend these limitations exhibit around two orders slower cooling times four larger temperatures than...

Hybrid two-dimensional (2D) lead halide perovskites have been employed in optoelectronic applications, including white-light emission for light-emitting diodes (LEDs). However, until now, there limited reports about white-light-emitting with experimental insights into the mechanism of broadband emission. Here, we present from a 2D hybrid chloride perovskite, using widely known phenethylammonium cation. The single-crystal X-ray structural data, time-resolved photophysical measurements, and...

A 50% enhancement in the conversion efficiency (4.9−7.37%) is realized dye-sensitized solar cells using hydrothermally synthesized TiO2−multiwalled carbon nanotube (MWCNT) nanocomposites as compared to TiO2 without MWCNT and Degussa P25. Several characterizations have been employed reveal nature of modification imparted MWCNTs under hydrothermal processing conditions resulting TiO2−MWCNT conjugation through −COOH groups. Efficient charge transfer nanocomposite efficient electron transport by...

A new protocol for the synthesis of a highly stable (over 2 months under ambient conditions) solution-processed core-shell type structure mixed methylammonium-octylammonium lead bromide perovskite nanoparticles (5-12 nm), having spherical shape, color tunability in blue to green spectral region (438-521 nm) and high photoluminescence quantum yield (PLQY) up 92% is described. The tunability, PLQY stability are due confinement imparted by crystal engineering associated with nanoparticle...

At the heart of electrically driven semiconductors lasers lies their gain medium that typically comprises epitaxially grown double heterostuctures or multiple quantum wells. The simultaneous spatial confinement charge carriers and photons afforded by smaller bandgaps higher refractive index active layers as compared to cladding in these structures is essential for optical-gain enhancement favorable device operation. Emulating inorganic media, superb properties highly stable low-threshold (as...

We report the high yield synthesis of about 11 nm sized CH3NH3PbBr3 nanocrystals with near-unity photoluminescence quantum yield. The are formed in presence surface-binding ligands through their direct precipitation a benzyl alcohol/toluene phase. alcohol plays pivotal role steering surface binding motifs on NC surface, resulting enhanced surface-trap passivation and PLQY values. further demonstrate that thin films from purified stable >4 months air, exhibit optical gain (about 520 cm-1),...

Abstract An ordered self‐assembly of CsPbBr 3 quantum dots (QDs) was generated on the surface few‐layer black phosphorus (FLBP). Strong quenching QD fluorescence observed, and analyzed by time‐resolved photoluminescence (TR‐PL) studies, DFT calculations, photoconductivity measurements. Charge transfer type I band alignment is suggested to be cause observed effects.

A van der Waals heterostructure between all-inorganic CsPbBr3 halide perovskite quantum dots (CPB QDs) and Ti3C2Tx MXene (MXN) QDs is realized, the photophysics of composite examined. strong quenching steady-state photoluminescence observed, which further examined by a time-resolved study. It attributed to charge transfer from CPB MXN followed rapid energy relaxation hot electrons holes toward band edge, leading their recombination with photon in far-IR domain. shown that CPB–MXN QD/QD...

A facile, solvothermal synthesis of mesoporous cerium oxide nanospheres is reported for the purpose photocatalytic degradation organic dyes and future applications in sustainable energy research. The earth-abundant, relatively affordable, mixed valence sample, which consists predominantly Ce 7 O 12 , has been characterized by powder X-ray diffraction, photoelectron UV–vis spectroscopy, transmission electron microscopy. Together with N 2 sorption experiments, data confirms that new material...

Sodium hydride (NaH) has been commonly used as a Brønsted base in chemical syntheses, while it rarely employed to add (H(-) ) unsaturated electrophiles. We previously developed procedure activate NaH through the addition of soluble iodide source and found that new NaH-NaI composite can effect even stereoselective nucleophilic reductions nitriles, imines, carbonyl compounds. In this work, we report mixing with NaI or LiI tetrahydrofuran (THF) solvent provides inorganic composite, which...

The ZnO nanoflowers loaded with gold (Au) nanoparticles (NPs) are synthesized by a hydrothermal route using mixed precursors and controlled conditions. dye-sensitized solar cells based on the Au NPs show power conversion efficiency of 2.5%, which is considerably higher than that without NPs. Detailed characterizations performed, presented, discussed.

An Fe-metal complex with 2′-hydroxy chalcone (2′-HC) ligands [Fe(III) (2′-hydroxy chalcone)3] is synthesized by a chemical route and subjected to different thermal treatments. Upon thermolysis in air at 450 °C for 3 h the yields maghemite (γ-Fe2O3) nanorods thin hematite (α-Fe2O3) shell. X-Ray diffraction (XRD), Mössbauer spectroscopy, diffuse reflectance spectroscopy (UV-DRS), high resolution transmission electron microscopy (HR-TEM), field emission scanning (FE-SEM) vibrating sample...

Combined theoretical as well experimental results provide evidence of hydrogen (H₂) evolution from aqueous solution by using few layered black phosphorus (nanosheets and nanoparticles) under visible light illumination.

Readily synthesized, new bis(arylimino)acenaphthene copper(<sc>i</sc>) complexes exhibit panchromatic light absorption to the NIR region and function in dye-sensitized solar cells.

The pendant, chelating ethers in the second coordination sphere of nickel salicylaldimine complexes bind alkali metals to promote hydrogen evolution electrocatalysis.

A triboelectric nanogenerator (TENG) based on natural seeds and electrospun poly(vinyl difluoride) (PVDF) fibers is reported. The nanofibers are specifically used to enhance the effects. mustard (flax) seed TENG renders an impressively high electrical output with average open circuit voltage of 84 V (126 V) maximum power density 334 mW m-2 (324 m-2) under impact force 40 N at 25 Hz. Basil relatively weaker in delivery. By comparing crust properties performances, we analyze powering...

Abstract Nanostructured bio-photocatalyst hydroxyapatite (HAp) was synthesized by a simple and productive wet chemical precipitation method to explore the photocatalytic performance of material for degradation Remazol Brilliant Blue R (RBBR) dye. Wet chemically nano-HAp characterized through x-ray diffraction, Transmission electron microscope, scanning N 2 -adsorption–desorption, thermo gravimetric analyzer, Fourier transform infrared UV–vis absorption techniques. Photocatalytic RBBR under...

Abstract An ordered self‐assembly of CsPbBr 3 quantum dots (QDs) was generated on the surface few‐layer black phosphorus (FLBP). Strong quenching QD fluorescence observed, and analyzed by time‐resolved photoluminescence (TR‐PL) studies, DFT calculations, photoconductivity measurements. Charge transfer type I band alignment is suggested to be cause observed effects.

In this work we report on the synthesis of various ZnO mesostructures (rods, spheres, flakes and flower-like morphologies) by hydrothermal co-precipitation methods their remarkable complete transformation into anatase TiO2 with nominally similar shapes using controlled low temperature TiCl4 treatment. Various techniques are used to demonstrate phase purity morphology details. Based careful examination rods tubes suggest a mechanism which embodies initial formation thin shell surface ion...

The exceptionally high theoretical capacity of silicon as a Li-ion battery anode material is hard to realize and stabilize in practice due huge volume changes during lithiation/de-lithiation. With the use black phosphorus additive we could achieve tremendous stability strain management.

In this work we have studied the feasibility of highly symmetric guanidinium (GA; CH6N3+) cation in perovskite based solar cells. It is an alternative to methyl ammonium (MA; CH3NH3+) or formamidinium (FA; CH(NH2)2+) ions commonly utilized cells, may bring additional advantages due its triad rotational symmetry and zero dipole moment (μ). We noticed that steric factors, GA preferably forms two-dimensional (2D) layer, where GA2PbI4 favored monoclinic structure (Eg = 2.5 eV) obtained device...

We report the development of a titania-nanoparticle-based solar paint which gives conversion efficiency 3.6% on FTO/glass substrates under fully room temperature processing. The cures quickly saving time in cell fabrication process. Even flexible ITO/PET substrate 2.4% was achieved. present and analyze results described materials device property characterizations.