Strain-Induced Intrinsic Constraint Boosts Slow-Thermalization and Fast-Transfer of Carriers in FAPbI Quantum Dot Solar Cells.

Formamidinium lead iodide quantum dots (FAPbI QDs) are extensively utilized in photovoltaic applications due to their superior optoelectronic characteristics. Nonetheless, the weak ionic bonds within their soft lattice structure lead to structural deformation, which causes a disordered charge distribution of FAPbI QDs. Stress engineering not only can mitigate the inherent soft lattice by reinforcing ion bonds but also can promote electron localization, thus enhancing charge carrier transfer.

Electrocatalytic CO Reduction to C Products via Enhanced C─C Coupling Over Cu-based Catalysts: Dynamic Reaction and Regulation Mechanism.

Benefiting from the optimal interaction strength between Cu and reactants, Cu-based catalysts exhibit a unique capability of facilitating the formation of various multi-carbon products in electricity-driven CO reduction reactions (COERR). Nonetheless, the COERR process on these catalysts is characterized by intricate polyproton-electron transfer mechanisms that are frequently hindered by high energy barriers, sluggish reaction kinetics, and low C─C coupling efficiency. This review employs advanced characterization techniques, such as sum frequency generation technology, to provide a comprehensive analysis of the COERR mechanism on the Cu surface, examining it from both spatial and temporal dimensions and proposing a spatial-temporal coupling reaction mechanism.

Application of advanced quantum dots in perovskite solar cells: synthesis, characterization, mechanism, and performance enhancement.

Quantum dots have garnered significant interest in perovskite solar cells (PSCs) due to their stable chemical properties, high carrier mobility, and unique features such as multiple exciton generation and excellent optoelectronic characteristics resulting from quantum confinement effects. This review explores quantum dot properties and their applications in photoelectronic devices, including their synthesis and deposition processes. This sets the stage for discussing their diverse roles in the carrier transport, absorber, and interfacial layers of PSCs.

Electrostatic Harmonization for Superior Charge Extraction at Interface for Stable High-Efficiency FAPbI Quantum Dots Solar Cells.

Organic-inorganic formamidinium lead triiodide (FAPbI) hybrid perovskite quantum dots (QDs) have garnered considerable attention in the photovoltaic field due to their narrow bandgap, exceptional environmental stability, and prolonged carrier lifetime. Unfortunately, their insulating ligands and surface vacancy defects pose significant obstacles to efficient charge transfer across device interfaces. In this work, an electrostatic harmonization strategy at the interface using a donor-acceptor dipole molecular attachment to achieve enhanced charge separation capabilities on the QD surface is ventured.

Surface Doping to Suppress Iodine Ion Migration for Stable FAPbI Perovskite Quantum Dot Solar Cells.

Formamidine lead iodide (FAPbI) quantum dots (QDs) have attracted great attention as a new generation of photovoltaic material due to their long carrier diffusion length, benign ambient stability, and light-harvesting ability. However, its large surface area with inherent thermodynamic instability and highly defective ionic termination are still major obstacles to fabricating high-performance devices. Herein, a metallic ion dopant is developed to post-treat FAPbI QDs immediately after their fabrication by using a metal-glutamate salt solution.

Induce (101) plane exposure boosting photocatalytic CO reduction in aerobic environment for NH-MIL-125.

NH-MIL-125 with abundant porosity and specific interactions with CO molecules, has been demonstrate great potential in the field of photocatalytic CO reduction. However, conventional NH-MIL-125 and their composites much lower CO photoreduction efficiency in aerobic environments because of the O competition. To circumvent the issue, this study modifies NH-MIL-125 through crystal facet engineering to enhance its selective CO adsorption and photocatalytic efficiency in the environment of impurity CO.

Construction Au/FAPbI Schottky Heterojunction towards a High-Speed Electron Transfer Channel for High-Performance Perovskite Quantum Dot Solar Cells.

Formamidinium lead triiodide quantum dot (FAPbI QD) exhibits substantial potential in solar cells due to its suitable band gap, extended carrier lifetime, and superior phase stability. However, despite great attempts toward reconfiguring the surface chemical environment of FAPbI QDs, achieving the optimal efficiency of charge carrier extraction and transfer in cells remains a challenge. To circumvent this problem, we selectively introduced Au/FAPbI Schottky heterojunctions by reducing Au to Au and subsequently anchoring them on the surface of FAPbI QDs, which acts as a light-harvesting layer and establishes high-speed electron transfer channels (Au dot ↔ Au dot).

Preferential growth and electron trap synergistically promoting photoreduction CO of Tm ion doping bismuth titanate nanosheets.

In this study, we prepared two-dimensional BiTiO nanosheets doped with rare earth ions. The experimental results show that BiTmTiO exhibits the highest reduction performance among various rare earth doped BiTiO materials, with a CO yield of 7.25 μmol gh.

Amino Acid Double-Passivation-Enhanced Quantum Dot Coupling for High-Efficiency FAPbI Perovskite Quantum Dot Solar Cells.

Formamidinium lead triiodide (FAPbI) perovskite quantum dot has outstanding durability, reasonable carrier lifetime, and long carrier diffusion length for a new generation of highly efficient solar cells. However, ligand engineering is a dilemma because of the highly ionized and dynamic characteristics of quantum dots. To circumvent this issue, herein, we employed a mild solution-phase ligand-exchange approach through adding short-chain amino acids that contain amino and carboxyl groups to modify quantum dots and passivate their surface defects during the purification process.

Bottom Distribution of F-Based Additives in Perovskite Films and Their Effects on Photovoltaic Performance.

Various additives have been introduced to assist in film preparation and defect passivation. Herein, fluoroiodobenzene (FIB) molecules with different numbers of F atoms were incorporated into perovskite films to optimize the film quality as well as passivate defects. Based on the calculation and experimental results, it was found that the FIB additives were inclined to exist at the bottom of the film because of the strong affinity between F atoms stemming from FIB molecules and O atoms stemming from TiO, especially for molecules with more F atoms.

Methylammonium Chloride as a Double-Edged Sword for Efficient and Stable Perovskite Solar Cells.

The additive engineering strategy promotes the efficiency of solution-processed perovskite solar cells (PSCs) over 25%. However, compositional heterogeneity and structural disorders occur in perovskite films with the addition of specific additives, making it imperative to understand the detrimental impact of additives on film quality and device performance. In this work, the double-edged sword effects of the methylammonium chloride (MACl) additive on the properties of methylammonium lead mixed-halide perovskite (MAPbI Cl ) films and PSCs are demonstrated.

2D/2D Schottky heterojunction of in-situ growth FAPbBr/TiC composites for enhancing photocatalytic CO reduction.

Mimicking the natural photosynthesis process to convert carbon dioxide into value-added chemicals is vital to solving both the climate crisis worldwide and the depletion of fossil fuels. Herein, we explore the synthesis of 2D FAPbBr nanoplate combined with 2D TiC nanosheet to form a 2D/2D FAPbBr/TiC Schottky heterojunction using facile hot-injection and in-situ growth approaches. The Schottky heterojunction of FAPbBr/TiC over large interfacial contact provides abundant channels for transferring photogenerated carriers from FAPbBr nanoplate to TiC nanosheet.

Recent advances in g-CN composites within four types of heterojunctions for photocatalytic CO reduction.

Studies of photocatalytic conversion of CO into hydrocarbon fuels, as a promising solution to alleviate global warming and energy issues, are booming in recent years. Researchers have focused their interest in developing g-CN composite photocatalysts with intriguing features of robust light harvesting ability, excellent catalysis, and stable performance. Four types of heterojunctions (type-II, Z-scheme, S-scheme and Schottky) of the g-CN composites are widely adopted.

Anchoring of Formamidinium Lead Bromide Quantum Dots on TiC Nanosheets for Efficient Photocatalytic Reduction of CO.

Metal halide perovskite with a suitable energy band structure and excellent visible-light response is a prospective photocatalyst for CO reduction. However, the reported inorganic halide perovskites have undesirable catalytic performances due to phase-sensitive and severe charge carrier recombination. Herein, we anchor the FAPbBr quantum dots (QDs) on TiC nanosheets to form a FAPbBr/TiC composite within a Schottky heterojunction for photocatalytic CO reduction.

Yb- and Mn-Doped Lead-Free Double Perovskite CsAgBiX (X = Cl, Br) Nanocrystals.

Lead-free double perovskite nanocrystals (NCs) have emerged as a new category of materials that hold the potential for overcoming the instability and toxicity issues of lead-based counterparts. Doping chemistry represents a unique avenue toward tuning and optimizing the intrinsic optical and electronic properties of semiconductor materials. In this study, we report the first example of doping Yb ions into lead-free double perovskite CsAgBiX (X = Cl, Br) NCs via a hot injection method.

Additive-assisted one-step formed perovskite/hole conducting materials graded heterojunction for efficient perovskite solar cells.

Solar cells based on organometallic perovskite materials have been intensively investigated as the most promising next-generation photovoltaic technology. The quality of perovskite film and the heterojunction between perovskite and charge transporting materials dominate the performance of resulting devices. Herein, we report a facile additive-assisted method to form perovskite/2, 2', 7, 7'-tetrakis (N, N-di-p-methoxyphenylamine)-9, 90-spirobifluorene (spiro-OMeTAD) graded heterojunction by one step instead of spin-coating two layers separately.

Pressure-Induced Phase Transformation and Band-Gap Engineering of Formamidinium Lead Iodide Perovskite Nanocrystals.

Formamidinium lead halide (FAPbX, X = Cl, Br, I) perovskite materials have recently drawn an increased amount of attention owing to their superior optoelectronic properties and enhanced material stability as compared with their methylammonium-based (MA-based) analogues. Herein, we report a study of the pressure-induced structural and optical evolutions of FAPbI hybrid organic-inorganic perovskite nanocrystals (NCs) using a synchrotron-based X-ray scattering technique coupled to in situ absorption and photoluminescence spectroscopies. As a result of their unique structural stability and soft nature, FAPbI NCs exhibit a wide range of band-gap tunability (1.

"114"-Type Nitrides LnAl(Si Al )N O with Unusual [AlN ] Octahedral Coordination.

Aluminum-nitrogen six-fold octahedral coordination, [AlN ], is unusual and has only been seen in the high-pressure rocksalt-type aluminum nitride or some complex compounds. Herein we report novel nitrides LnAl(Si Al )N O (Ln=La, Sm), the first inorganic compounds with [AlN ] coordination prepared via non-high-pressure synthesis. Structure refinements of neutron powder diffraction and single-crystal X-ray diffraction data show that these compounds crystallize in the hexagonal Swedenborgite structure type with P6 mc symmetry where Ln and Al atoms locate in anticuboctahedral and octahedral interstitials, respectively, between the triangular and Kagomé layers of [SiN ] tetrahedra.

Enhanced conversion efficiency in perovskite solar cells by effectively utilizing near infrared light.

Up-conversion β-NaYF4:Yb(3+),Tm(3+)/NaYF4 core-shell nanoparticles (NYF NPs) with a high luminous intensity in the visible light region were synthesized by a hydrothermal reaction process. Photocurrent densities of the mesoscopic perovskite solar cells fabricated by incorporating up-conversion NYF NPs into the electron transporting layer are effectively enhanced. The effects of the thicknesses of the electron transporting layer and the weight ratio of up-conversion NYF NPs/TiO2 on the power conversion efficiency (PCE) of the as-fabricated devices were also investigated.

Enhanced Conversion Efficiencies in Dye-Sensitized Solar Cells Achieved through Self-Assembled Platinum(II) Metallacages.

Two-component self-assembly supramolecular coordination complexes with particular photo-physical property, wherein unique donors are combined with a single metal acceptor, can be utilized for many applications including in photo-devices. In this communication, we described the synthesis and characterization of two-component self-assembly supramolecular coordination complexes (SCCs) bearing triazine and porphyrin faces with promising light-harvesting properties. These complexes were obtained from the self-assembly of a 90° Pt(II) acceptor with 2,4,6-tris(4-pyridyl)-1,3,5-triazine (TPyT) or 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphine (TPyP).

Highly Efficient Flexible Perovskite Solar Cells Using Solution-Derived NiOx Hole Contacts.

A solution-derived NiOx film was employed as the hole contact of a flexible organic-inorganic hybrid perovskite solar cell. The NiOx film, which was spin coated from presynthesized NiOx nanoparticles solution, can extract holes and block electrons efficiently, without any other post-treatments. An optimal power conversion efficiency (PCE) of 16.

Enhanced photoluminescence and thermal properties of size mismatch in Sr(2.97-x-y)Eu0.03Mg(x)Ba(y)SiO5 for high-power white light-emitting diodes.

In this Study, Mg(2+) and Ba(2+) act to enhance the maximum emission of Sr2.97SiO5:0.03Eu(2+) significantly and redshift the emission band to the orange-red region in Sr(2.

Structure, photoluminescent and cathodoluminescent properties of a rare-earth free red emitting β-Zn3B2O6:Mn2+ phosphor.

A rare-earth free red emitting β-Zn3B2O6:Mn(2+) phosphor was prepared by a solid-state reaction method. The crystal structure, photoluminescent and cathodoluminescent properties of β-Zn3B2O6:Mn(2+) were systematically investigated. The absorption and photoluminescence excitation spectra confirm that β-Zn3B2O6:Mn(2+) matches the UV LED chip.