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As the electron transport layer in quantum dot light‐emitting diodes (QLEDs), ZnO suffers from excessive electrons that lead to luminescence quenching of the quantum dots (QDs) and charge‐imbalance in QLEDs. Therefore, the interplay between ZnO and QDs requires an in‐depth understanding. In this study, DFT and COSMOSL simulations are employed to investigate the effect of sulfur atoms on ZnO. Based...
Quantum Dot Light‐Emitting Diodes
In article number 2307298, Xiao Wei Sun and co‐workers improved quantum dot light‐emitting diodes (QLEDs) by thiol ligands of ZnO. ZnO nanocrystals were modified to reduce electron excess without hindering charge injection. This modification strategy significantly enhanced QLED performance, achieving an external quantum efficiency of over 23% and a long lifetime of...
Severe nonradiative recombination and open‐circuit voltage loss triggered by high‐density interface defects greatly restrict the continuous improvement of Sn‐based perovskite solar cells (Sn‐PVSCs). Herein, a novel amphoteric semiconductor, O‐pivaloylhydroxylammonium trifluoromethanesulfonate (PHAAT), is developed to manage interface defects and carrier dynamics of Sn‐PVSCs. The amphiphilic ionic...
The use of 2D materials to produce hydrogen (H2) fuel via photocatalytic water splitting has been intensively studied. However, the simultaneous fulfillment of the three essential requirements—high photon utilization, rapid carrier transfer, and low‐barrier redox reactions—for wide‐pH‐range production of H2 still poses a significant challenge with no additional modulation. By employing the first‐principles...
Copper(I)‐based halides have recently attracted increasing attention as a substitute for lead halides, owing to their nontoxicity, abundance, unique structure, and optoelectric properties. However, exploring an effective strategy to further improve their optical activities and revealing structure−optical property relationships still remain a great concern. Here, by using high pressure technique, a...
Lung cancer is one of the most common malignancies worldwide and contributes to most cancer‐related morbidity and mortality cases. During the past decades, the rapid development of nanotechnology has provided opportunities and challenges for lung cancer diagnosis and therapeutics. As one of the most extensively studied nanostructures, metal nanoparticles obtain higher satisfaction in biomedical applications...
Ternary architecture has been widely demonstrated as a facile and efficient strategy to boost the performance of organic solar cells (OSCs). However, the rational design of the third component with suitable core and end‐group modification is still a challenge. Herein, two new small‐molecule (SM) donors BT‐CN and BT‐ER, featuring the identical conjugated backbone with distinct end group, have been...
Surface states are one of the crucial factors determining the phase stability of formamidinium‐based perovskites. Compared with other compositions, exclusive lattice strain in FAPbI3 perovskite generates defects at the surface more readily, making them more vulnerable at the surface and easier to trigger the phase transition from α‐phase to the non‐perovskite δ‐phase. In order to regulate the surface...
Lithium‐ and manganese‐rich layered oxides (LMLOs, ≥ 250 mAh g−1) with polycrystalline morphology always suffer from severe voltage decay upon cycling because of the anisotropic lattice strain and oxygen release induced chemo‐mechanical breakdown. Herein, a Co‐free single‐crystalline LMLO, that is, Li[Li0.2Ni0.2Mn0.6]O2 (LLNMO‐SC), is prepared via a Li+/Na+ ion‐exchange reaction. In situ synchrotron‐based...
Adequately harvesting all excitons in a single molecule and inhibiting exciton losses caused by intermolecular interactions are two important factors for achieving high efficiencies thermally activated delayed fluorescence (TADF). One potential approach for optimizing these is to tune alignment of various excited state energy levels by using different doping concentrations. Unfortunately, emission...
Encapsulation and transplantation of insulin‐producing cells offer a promising curative treatment for type 1 diabetes (T1D) without immunosuppression. However, biomaterials used to encapsulate cells often elicit foreign body responses, leading to cellular overgrowth and deposition of fibrotic tissue, which in turn diminishes mass transfer to and from transplanted cells. Meanwhile, the encapsulation...
Solid‐state fluoride‐ion batteries (FIBs) circumvent multiple formidable bottlenecks of lithium‐ion batteries, but their overall performance remains inferior due to the absence of appropriate solid electrolytes. Presently the conductivity of most solid electrolytes for FIBs is too low to enable room‐temperature cycling, while the few sufficiently conductive ones only allow for very low discharge voltages...
Pursuing high areal energy density and developing scalable fabrication strategies of micro‐batteries are the key for the progressive printed microelectronics. Herein, the scalable fabrication of multi‐layer printable lithium ion micro‐batteries (LIMBs) with ultrahigh areal energy density and exceptional flexibility is reported, based on highly conductive and mechanically stable inks by fully incorporating...
Formation of 3D networks is a crucial process for endothelial cells during development of primary blood vessels under both normal and pathological conditions. In order to investigate effects of oxygen microenvironment and matrix composition on the 3D network formation, an upside‐down microfluidic cell culture device capable of generating oxygen gradients is developed in this paper. In cell experiments,...
Oxygen tension and extracellular matrix compositions play important roles in network formation of endothelial cells. In article number 2006091, Yi‐Chung Tung and co‐workers develop an in vitro model using an upside‐down microfluidic device capable of generating oxygen gradients for three‐dimensional cell culture within hydrogels under controlled oxygen microenvironments.
Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all‐inorganic cesium‐based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is...
Modern nanotechnologies bring humanity to a new age, and advanced methods for preparing functional nanocrystals are cornerstones. A considerable variety of nanomaterials has been created over the past decades, but few were prepared on the macro scale, even fewer making it to the stage of industrial production. The gap between academic research and engineering production is expected to be filled by...
In article number 1906276, Jian Liu, Shaomin Liu, and co‐workers report a Cu/ZnO catalyst for syngas conversion. The cover shows the Cu/ZnO catalyst in the metal–organic framework (MOF)‐derived octahedral shape. Taking advantage of this unique structure to provide catalyst confinement and intimate contact, high selectivity and superior catalytic stability are achieved in the direct syngas to dimethyl...
Direct conversion of syngas to dimethyl ether (DME) through the intermediate of methanol allows more efficient DME production in a simpler reactor design relative to the conventional indirect route. Although Cu/ZnO‐based multicomponent catalysts are highly active for methanol synthesis in this process, the sintering issue of Cu during the prolonged reaction generally deteriorates their performance...
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