Interfacial engineering through lead binding using crown ethers in perovskite solar cells

In the domain of perovskite solar cells(PSCs),the imperative to reconcile impressive photovoltaic performance with lead-related issue and environmental stability has driven innovative solutions.This study pioneers an approach that not only rectifies lead leakage but also places paramount importance on the attainment of rigorous interfacial passivation.Crown ethers,notably benzo-18-crown-6-ether(B18C6),were strategically integrated at the perovskite-hole transport material interface.Crown ethers exhibit a dual role:efficiently sequestering and immobilizing Pb^(2+)ions through host-guest complexation and simultaneously establishing a robust interfacial passivation layer.Selected crown ether candidates,guided by density functional theory(DFT)calculations,demonstrated proficiency in binding Pb2+ions and optimizing interfacial energetics.Photovoltaic devices incorporating these materials achieved exceptional power conversion efficiency(PCE),notably 21.7%for B18C6,underscoring their efficacy in lead binding and interfacial passivation.Analytical techniques,including time-of-flight secondary ion mass spectrometry(ToF-SIMS),ultraviolet photoelectron spectroscopy(UPS),time-resolved photoluminescence(TRPL),and transient absorption spectroscopy(TAS),unequivocally affirmed Pb^(2+)ion capture and suppression of non-radiative recombination.Notably,these PSCs maintained efficiency even after enduring 300 h of exposure to 85%relative humidity.This research underscores the transformative potential of crown ethers,simultaneously addressing lead binding and stringent interfacial passivation for sustainable PSCs poised to commercialize and advance renewable energy applications.

平面三棱轴联结与键联结结构比较分析

分别建立了平面三棱轴联结与键联结结构分析的 2维有限元模型。考虑零件之间的接触特性 ,对比分析了 2种联结结构的承载能力。

Perovskites for Laser and Detector Applications

Perovskite materials have triggered a renewed interest in photovoltaic research in the recent years.They display crystal forms with 0D,1D and 2D,3D motifs,and several chemical forms,namely inorganic(titanates,rubidiates,nobiates,tantalates etc.),organic/inorganic metal halides with single to multiple cations,and even organic polymer or quantum dot-infused hybrids.Each crystal type and chemical form are endowed with specific physicochemical,optical,electronic,and morphological properties.These unique properties render them suitable for targeted applications,namely photovoltaics,LEDs,photocatalysis/electrolysis/solar fuels/solar and Li-ion batteries,gas-sensors,ferroelectrics,capacitors,transistors and memristors,photodetectors,and lasers,for advanced quantum cryptography and outer space applications.At first,the crystal and material types,and physicochemical,morphological,and optoelectronic properties of perovskite materials are discussed.Particularly,we focus on those properties which cumulatively contribute to their application in the abovementioned fields.Simultaneously,a comprehensive discussion about the advances in each field is presented.Structure/property/application relationships with key advances demonstrate the versatility of perovskites in modern optoelectronic technologies.

多屏营销监测不为挑起营销平台之争

多屏营销引用谷歌的分析结果,全球角度来讲或是中国角度来讲,有超过90%的人现在都在用多个电子产品,不光是大家随身携带的手机,包括电脑、电视机等等,用户在不同的场合下,跟你品牌沟通的渠道更加多样化,这也为企业营销带来了一个机遇和挑战。挑战就是怎么样更好地搜集这些数据做进一步整合,提供一个全方位的方案。机遇就是企业有更多渠道跟客户沟通,在不同场合通过用户的喜好,提供自己的一些产品和服务。

解除“飘浮炸弹”的引信

可以快速关闭的新型液压连接器使天然气的海运装卸更加安全。为了节约研发时间,该连接器的设计完全是在计算机上完成的。另外,由于迄今为止还没有在极高压力下工作的类似解决方案,所以此液压快速连接器的设计是需要从头开始的全新研发工作。

Unconventional bound states in the continuum from metamaterial-induced electron acoustic waves

Photonic bound states in the continuum(BICs)are spatially localized modes with infinitely long lifetimes,which exist within a radiation continuum at discrete energy levels.These states have been explored in various systems,including photonic and phononic crystal slabs,metasurfaces,waveguides,and integrated circuits.Robustness and availability of the BICs are important aspects for fully taming the BICs toward practical applications.Here,we propose a generic mechanism to realize BICs that exist by first principles free of fine parameter tuning based on non-Maxwellian double-net metamaterials(DNMs).An ideal warm hydrodynamic double plasma(HDP)fluid model provides a homogenized description of DNMs and explains the robustness of the BICs found herein.In the HDP model,these are standing wave formations made of electron acoustic waves(EAWs),which are pure charge oscillations with vanishing electromagnetic fields.EAW BICs have various advantages,such as(i)frequency-comb-like collection of BICs free from normal resonances;(ii)robustness to symmetry-breaking perturbations and formation of quasi-BICs with an ultrahigh Q-factor even if subject to disorder;and(iii)giving rise to subwavelength microcavity resonators hosting quasi-BIC modes with an ultrahigh Q-factor.

Identifying malicious accounts in blockchains using domain names and associated temporal properties

The rise in the adoption of blockchain technology has led to increased illegal activities by cybercriminals costing billions of dollars.Many machine learning algorithms are applied to detect such illegal behavior.These algorithms are often trained on the transaction behavior and,in some cases,trained on the vulnerabilities that exist in the system.In our approach,we study the feasibility of using the Domain Name(DN)associated with the account in the blockchain and identify whether an account should be tagged malicious or not.Here,we leverage the temporal aspects attached to the DN.Our approach achieves 89.53%balanced-accuracy in detecting malicious blockchain DNs.While our results identify 73769 blockchain DNs that show malicious behavior at least once,out of these,34171 blockchain DNs show persistent malicious behavior,resulting in 2479 malicious blockchain DNs over time.Nonetheless,none of these identified malicious DNs were reported in new officially tagged malicious blockchain DNs.

High refractive index of melanin in shiny occipital feathers of a bird of paradise

Male Lawes’s Parotia,a bird of paradise,use the highly directional reflection of the structurally colored,brilliant-silvery occipital feathers in their courtship display.As in other birds,the structural coloration is produced by ordered melanin pigmentation.The barbules of the Parotia’s occipital feathers,with thickness,3 μm,contain 6–7 layers of densely packed melanin rodlets(diameter,0.25 μm,length,2 μm).The effectively,0.2 μm thick melanin layers separated by,0.2 μm thick keratin layers create a multilayer interference reflector.Reflectance measurements yielded peak wavelengths in the near-infrared at,1.3 μm,i.e.,far outside the visible wavelength range.With the Jamin-Lebedeff interference microscopy method recently developed for pigmented media,we here determined the refractive index of the intact barbules.We thus derived the wavelength dependence of the refractive index of the barbules’melanin to be 1.7–1.8 in the visible wavelength range.Implementing the anatomical and refractive index data in an optical multilayer model,we calculated the barbules’reflectance,transmittance and absorptance spectra,thereby confirming measured spectra.

p38γand p38δas biomarkers in the interplay of colon cancer and inflammatory bowel diseases

Dear Editor,Colorectal cancer(CRC)is the second leading cause of cancer death according to the World Health Organization.Patients with inflammatory bowel disease(IBD),ulcerative colitis(UC)or Crohn’s disease(CD)are at increased risk of developing colitis-associated CRC(CAC)[1];however,our understanding of the inflammationcancer interplay at the molecular level is still limited.

元宇宙快问慢答

胖鲸传媒CEO范怿电通创意中国首席创意官陈民辕每日互动高级副总裁刘宇iProspect中国首席执行官李凤龄Merkle中国营销平台负责人张璐元宇宙创意dentsu Z龙依梦你自己相信元宇宙吗?你眼中的元宇宙是什么?龙依梦:dentsuZ在电通像一个特种部队一样,我们所有的年轻人基本都是95后,其实是由一个100%Z世代年轻人、斜杠青年组成的团队。首先在职位名称上就和正常的广告公司不太一样,我们的职位不会以Copy、Art划分,而是以视觉先锋、文字说客等有意思的称呼描述职能。