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Perovskite light‐emitting diodes (PeLEDs) have shown incalculable application potential in the fields of next‐generation displays and light communication owing to the rapidly increased external quantum efficiencies (EQEs). However, most PeLEDs obtain a maximum EQE at small current density (J) region and suffer from severe efficiency roll‐off in different extents. Herein, it is demonstrated that the...
Vacuum vapor deposition (VVD) is a promising way to advancing the commercialization of perovskite light sources owing to its convenience for wafer‐scale mass production and compatibility with silicon photonics manufacturing infrastructure. However, the light emission performance of VVD‐grown perovskites still lags far behind that of the conventional solution‐processed counterparts due to their inferior...
Tandem Solar Cells
Light‐induced phase segregation is the chief culprit for the open‐circuit voltage deficit and photo‐instability in mix‐halide perovskite solar cells with wide‐bandgap. In article number 2203319, Xuegong Yu and co‐workers report a highly efficient and photo‐stable wide‐bandgap perovskite solar cell with a top‐ranking open‐circuit voltage of 1.24 V realized by defects management in...
Wide‐bandgap perovskite solar cells (PSCs) with an optimal bandgap between 1.7 and 1.8 eV are critical to realize highly efficient and cost‐competitive silicon tandem solar cells (TSCs). However, such wide‐bandgap PSCs easily suffer from phase segregation, leading to performance degradation under operation. Here, it is evident that ammonium diethyldithiocarbamate (ADDC) can reduce the detrimental...
The band alignment, interface states, interface coupling, and carrier transport of semiconductor heterojunctions (SHs) need to be well understood for the design and fabrication of various important semiconductor structures and devices. Scanning tunneling microscopy (STM) with high spatial resolution and scanning tunneling spectroscopy (STS) with high energy resolution are significantly contributing...
Transformation of CO2 into value‐added products via photothermal catalysis has become an increasingly popular route to help ameliorate the energy and environmental crisis derived from the continuing use of fossil fuels, as it can integrate light into well‐established thermocatalysis processes. The question however remains whether negative CO2 emission could be achieved through photothermal catalytic...
Here it is shown that polyoxometalate (POM) clusters (H3PW12O40·xH2O, PW12) can be introduced to interact with Au nanoclusters to form the “A‐B‐A‐B” type building block (“A” represents Au nanoclusters and “B” stands for PW12 clusters), which continue to grow into copolymer‐analogue Au−PW12 sub‐1 nm nanowires. Due to the synergetic effect of Au nanoclusters and POMs, the obtained Au−PW12 sub‐1 nm nanowires...
1D silicon‐based nanomaterials, renowned for their unique chemical and physical properties, have enabled the development of numerous advanced materials and biomedical technologies. Their production often necessitates complex and expensive equipment, requires hazardous precursors and demanding experimental conditions, and involves lengthy processes. Herein, a flash solid–solid (FSS) process is presented...
Developing an efficient electrocatalyst for the hydrogen evolution reaction (HER) working in both acidic and alkaline solutions is highly desirable, but still remains challenging. Here, PtxNi ultrathin nanowires (NWs) with tunable compositions (x = 1.42, 3.21, 5.67) are in situ grown on MXenes (Ti3C2 nanosheets), serving as electrocatalysts toward HER. Such PtxNi@Ti3C2 electrocatalysts exhibit excellent...
Icosahedral, octahedral, and cubic Pd@Pt core–shell nanocrystals with two atomic Pt layers are epitaxially generated under thermodynamic control. Such icosahedra exhibit remarkably enhanced catalytic properties for oxygen reduction reaction compared to the octahedra and cubes as well as commercial Pt/C, which can be attributed to ligand and geometry effects, especially twin‐induced strain effect that...
In article number 1603423, He Tian, Jianbo Wu, Hui Zhang, and co‐workers develop a thermodynamically controlled method for the epitaxial growth of atomically layered Pt shells on icosahedral, octahedral, and cubic Pd seeds, with Pd‐Pt core‐shell icosahedra being the best electrocatalysts for oxygen reduction reaction. The cover image shows that most of Pt shells in the icosahedra are dominated by...
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