ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHighly Stable Cesium Lead Halide Perovskite Nanocrystals through in Situ Inorganic PassivationJu Young Woo†‡, Youngsik Kim‡§, Jungmin Bae#, Tae Gun Kim∥#, Jeong Won Doh C. Lee*†, and Sohee Jeong*‡§View Author Information† Department of Chemical Biomolecular Engineering (BK21+ Program), KAIST Institute for the NanoCentury, Korea Advanced Science Technology (KAIST), Daejeon 305-701, Korea‡ Nano-Convergence Research Division, Machinery Materials...

Abstract Despite the technological importance of colloidal covalent III-V nanocrystals with unique optoelectronic properties, their synthetic process still has challenges originating from complex energy landscape reaction. Here, we present InP tetrapod as a crystalline late intermediate in pathway that warrants controlled growth. We isolate species well-defined surfaces (110) and ( $$\bar{1}\bar{1}\bar{1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow>...

Recently, the structural stability of all-inorganic halide perovskite nanocrystals has been significantly enhanced. To understand enhancement, we developed surface-passivation models for cubic CsPbBr3 with anionic (oleate) and cationic (oleylammonium) organic ligands based on first-principles calculations nuclear magnetic resonance investigations. We propose that (100) surface is initially terminated oleate ligand complexes PbBr2(100) surfaces. Also, transition to oleylammonium Pb-rich...

Indium antimonide (InSb), a narrow band gap III–V semiconductor is promising infrared-active material for various optoelectronic applications.

As mobile Internet applications supporting real-time communications services are pervasively used, traffic patterns in networks have changed significantly. New differ from traditional such as web browser and FTP that they need always-on connectivity generate a large amount of signaling traffic. The these new lead to frequent change radio resource control states between connected idle the user equipment, consuming device battery power causing excessive overhead. growth has resulted surge...

Perovskite solar cells adopting a layer of various nanocrystals (NCs) on top perovskite film exhibit similar enhancement the photovoltaic (PV) properties regardless kind NC material, even though materials possess different electrical and optical properties. In this paper, we reveal that key reason for enhanced PV performance is surface passivation effect by oleylamine ligands NCs.

As the properties of a semiconductor material depend on fate excitons, manipulating exciton behavior is primary objective nanomaterials. Although nanocrystals exhibit unusual excitonic characteristics owing to strong spatial confinement, studying interactions between excitons in single nanoparticle remains challenging due rapidly vanishing multiexciton species. Here, platform for tailoring using straightforward strategy shape-tuning single-crystalline presented. Spectroscopic and theoretical...

The Single Aperture Large Telescope for Universe Studies (SALTUS) is a deployable space telescope designed to provide the astrophysics community with an extremely large far-infrared (far-IR) observatory explore our cosmic origins. SALTUS can observe thousands of faint astrophysical targets, including first galaxies, protoplanetary disks in various evolutionary states, and wide variety solar system objects. design architecture utilizes radiatively cooled, 14-m diameter unobscured aperture,...

The intermodulation (IM) mechanism of heterojunction bipolar transistors (HBTs) has been studied by using an analytical nonlinear equivalent circuit model and Volterra-series analysis the model. Although third-order IM intercept point (IP3) does not depend on emitter parameter, it is appreciably affected base collector parameters substantially improved utilizing punchthrough structure. measured IP3 HBTs 31 dBm with 150-mW dc power, which higher than that normal 3 dB. investigation...

The Single Aperture Large Telescope for Universe Studies (SALTUS) is a deployable space telescope designed to provide the astrophysics community with an extremely large far-infrared (far-IR) observatory explore our cosmic origins. SALTUS can observe thousands of faint astrophysical targets, including first galaxies, protoplanetary disks in various evolutionary states, and wide variety solar system objects. design architecture utilizes radiatively cooled, 14-m diameter unobscured aperture,...

This work explored the role of ZnBr₂ in surface composition and photoluminescence stability CsPbBr₃ nanocrystals.

The energetic sulfide vapor process on colloidal indium arsenide (InAs) quantum dots (QDs) for integrated optoelectronic devices is demonstrated. X‐ray photoemission spectroscopy supports the presence of sulfur QD surface, which increases air stability, and ultraviolet field‐effect transistor analysis confirm n‐type charge transport corresponding films with higher electron mobilities. Photoconductivity same in near‐infrared wavelength shows gate bias‐dependent recombination photogenerated...

Post-synthetic surface redesign significantly enhances the stability of perovskite nanocrystals.

We present a metrology target design (MTD) framework based on co-optimizing lithography and performance. The overlay performance is strongly related to the optimizing under different process variations in high NA optical tool measurement conditions becomes critical for sub-20nm nodes. can be quantified by device matching printability metrics, while accuracy precision metrics are used quantify Based using these we demonstrate how optimized improve maintaining good rotated dipole illumination...

In this research, we studied the parasitic parameters inducing electrical coupling between a sensor and PZT actuator using simple equivalent circuit model of cantilever with piezoresistor actuator. A fully integrated self-actuating has been newly designed, fabricated, characterized for high speed AFM. The fabricated cantilevers provide 0.55 /spl mu/m/V tip displacement about 5 times lower crosstalk than previous structure. measured resonant frequency was 73 kHz, which is 100 higher...

This paper describes measurements of the radar cross section (RCS) quadcopters at Long Term Evolution (LTE) frequency, with test equipments based on a Network Analyzer and two antennas for LTE base stations. Monostatic bistatic RCS results are obtained analyzed.

In order to improve the wind performance of buckling-restrained braces (BRBs), Hybrid (H-BRBs) have been studied in Korea. The seismic H-BRBs is different according action VE damper. this study, nonlinear time history analyses performed on parameters such as brace types and input earthquakes. results study suggest that meet BRB's requirement ANSI/AISC 341-10 only if damper not working during an earthquake.

Objectives : In the present study, contents of cinnamic acid and cinnamaldehyde in three different parts Cinnamomi Ramulus (CR) (the whole body, bark part, wood part) was evaluated using UPLC (ultra performance liquid chromatography) order to investigate a suitable cutting method. Methods Analysis performed on SMART LC with UV detector. Reference compounds were separated Inertsil ODS-4 column (, , GL Science, Japan) isolation elution water acetonitrile each containing acetic at flow rate ....

In the realm of astronomical scientific exploration, deployable and scalable approaches in space telescope systems are reshaping our understanding universe. Two revolutionary membrane-based designs, on-axis OASIS (Orbiting Astronomical Satellite for Investigating Stellar Systems) off-axis SALTUS (Single Aperture Large Telescope Universe Studies), have been developed as mid/far-infrared concepts featuring an inflatable primary mirror. Through aperture design, these telescopes leverage...

The demand for rechargeable batteries with high-energy density has driven innovations in cell design and materials. One such innovation is the development of a metal-free seawater battery that uses seawater...

Extreme Ultraviolet (EUV) is the most promising technology as substitute for multiple patterning based on ArF immersion lithography. If enough productivity can be accomplished, EUV will take main role in chip manufacturing. Since introduction of NXE3300, many significant results have been achieved source power and availability, but lots improvements are still required various aspects implementation lithography high volume Among them, it especially important to attain sensitivity resist...

A new generation of ultralight space telescopes can be enabled by multiple-order-diffraction-engineered-material (MODE) lenses, which are ultralightweight, transmissive, and assembled into very large apertures. In this paper, a diffraction-limited, 0.24-m diameter aperture, nine-segment MODE-lens telescope is designed for the astronomical R-band wavelength.

Reduction of microvibration is regarded as important in high-technology facilities with high precision equipments. In this paper, smart control technology used to improve the performance. Mr damper make a base isolation system amd fuzzy logic algorithm employed appropriately MR damper. order develop optimal algorithm, multi-objective genetic study. As an excitation, train-induced ground acceleration for time history analysis and three-story example building structure employed. Microvibration...