Tetragonal Ta2Se is a layered, Ta-rich chalcogenide that departs from conventional MX2 transition-metal dichalcogenides by hosting dense Ta-Ta networks capped by Se square-net layers. Here, we present a unified first-principles investigation of hydrostatic-pressure tuning in Ta2Se from 0 to 10 GPa, connecting the structural response, mechanical stability, thermophysical indicators, bonding evolution, electronic and optical behavior, lattice dynamics and superconductivity within a single framework. The derived thermophysical descriptors corroborate a pressure-stiffened lattice: density increases, Debye temperature rises, melting temperature is elevated and minimum thermal conductivity increases, whereas the Grüneisen parameter remains within a narrow window, suggesting no anomalous anharmonic softening. Bond population metrics and electron-density-difference analysis revealed a mixed metallic-covalent bonding picture dominated by a robust Ta-Ta metallic backbone, accompanied by pressure-strengthened Ta-Se hybridization. Electronic-structure calculations show persistent metallicity under compression; pressure broadens bands, reduces density of states at the Fermi level, reshapes the Fermi surface and points to a possible Lifshitz-type reconstruction without symmetry breaking. The optical response remained metallic with Drude-like low-energy behavior and pressure-tunable spectral features. The phonon dispersions exhibit no imaginary modes, confirming dynamical stability. Electron-phonon coupling calculations classify Ta2Se as a weak-coupling, phonon-mediated superconductor with Tc around 3.9 K, consistent with available experiments and establish pressure as a practical control knob for stability and superconductivity-relevant descriptors in this metal-rich layered platform.
Possible applications of Mo2C in the orthorhombic and hexagonal phases explored via ab-initio investigations of elastic, bonding, optoelectronic and thermophysical properties
A comparative study of the structural, elastic, thermophysical, and optoelectronic properties of CaZn$_2$X$_2$ (X = N, P, As) semiconductors via ab-initio approach
本文用密度泛函理论计算了三元半导体CaZn $_2$ X $_2$(X = N,P,As)的结构、弹性、晶格动力学、热物理和光电性质.所得到的晶格参数与实验值和其他理论结果吻合得很好。这些弹性常数满足机械稳定性准则。此外,许多热物理参数的这些化合物,包括德拜温度,平均声速,熔化温度,热容,晶格热导率等的弹性常数和模量的综合分析表明,CaZn $_2$ X $_2$化合物具有较好的可加工性,相对较高的维氏硬度和相对较低的德拜温度。首次研究了CaZn $_2$ P $_2$和CaZn $_2$ As $_2$的声子色散曲线和声子态密度。从声子色散曲线可以看出,体相CaZn $_2$ X $_2$(X = N,P,As)化合物是动态稳定的.通过能带结构和电子态能量密度研究了其电子性质。电子能带结构表明,CaZn $_2$ N $_2$和CaZn $_2$ As $_2$具有直接带隙,而化合物CaZn $_2$ P $_2$具有间接带隙.研究了CaZn $_2$ X $_2$(X = N,P,As)化合物的成键特性。与能量相关的光学参数与电子态的能量密度特征有很好的对应关系。我们对这些半导体材料的反射率、吸收系数、折射率、介电函数、电导率和损耗函数进行了深入的讨论。对CaZn $_2$ X $_2$(X = N,P,As)的光吸收光谱、反射光谱和折射率的研究表明,该化合物有望用于光电子器件…
Structural stability, electronic band structure, and optoelectronic properties of quaternary chalcogenide CuZn2MS4 (M =In and Ga) compounds via first principles
Chalcogenide perovskite BaZrS3 thin-film electronic and optoelectronic devices by low temperature processing
由于其优异的可见光吸收和高化学稳定性,硫属钙钛矿钡锆硫化物在过去几年中作为用于光电子学的混合卤化物钙钛矿的潜在替代物而引起了显著关注。然而,BaZrS 3薄膜在1000 ℃以上的高加工温度严重限制了它们在器件应用中的潜力。在此,我们报告的BaZrS 3薄膜的合成温度低至500 ℃,通过改变化学反应途径。X射线衍射和拉曼光谱证实了BaZrS 3薄膜为单相结构。原子力显微镜和扫描电子显微镜表明,晶体尺寸和表面粗糙度一致降低退火温度。较低的温度进一步消除了与高温处理相关的硫空位和碳污染。在较低温度下合成硫属化物钙钛矿薄膜的能力消除了其器件制造的主要障碍。光电探测器表现出快速响应和80的开/关比。所制造的场效应晶体管显示出双极行为,电子和空穴迁移率分别为16.8 cm 2/Vs和2.6 cm 2/Vs。
An ab initio approach to understand the structural, thermophysical, electronic, and optical properties of binary silicide SrSi2: A double Weyl semimetal
DFT based investigation of structural, elastic, optoelectronic, thermophysical and superconducting state properties of binary Mo3P at different pressures
Newly synthesized 3D boron-rich chalcogenides B12X (X = S, Se): Theoretical characterization of physical properties for optoelectronic and mechanical applications
Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals: Optoelectronic Properties, Air Stability and Photosensitivity
我们报告的铜硫硒化物以及硒化铜纳米晶体与有机π系统钴β-四氨基酞菁的配体交换的效果,并分析这些混合材料的薄膜的结构,光学和电学性质的变化。紫外-可见吸收光谱和拉曼光谱表明配体与纳米晶表面有很强的相互作用。掠入射小角度X射线散射研究表明,在配体交换后,粒子间距离显着收缩。对于缺铜的硒化铜,这种收缩对电传输的影响可以忽略不计,而对于缺铜的硫化硒化铜,电导率增加了8个数量级,并导致类似金属的温度依赖性传输。我们讨论了这些差异,在光的电子与离子传输在两种材料中的不同贡献,并强调其在环境条件下的传输性能的稳定性的影响。与光电流测量,我们证明了高的光响应度为200-400 A W-1的酞菁封端的硫化硒化铜,并强调在这方面的有机π-系统,作为一个电子连接器和光敏剂在同一时间的有益作用。
Computational study of structural, elastic, electronic, phonon dispersion relation and thermodynamic properties of orthorhombic CaZrS$_3$ for optoelectronic applications
Alloying behavior of wide band gap alkaline-earth chalcogenides
合金化是调整材料的一种强大工具,有助于针对各种应用设计所需的性能。在这项工作中,我们提供了一个全面的调查合成的可及性和电子性质的碱土硫属阴离子合金(CaS $_{1-x}$ O $_x$、CaS $_{1-x}$ Se $_x$、CaS $_{1-x}$ Te $_x$、SrS $_{1-x}$ O $_x$、SrS $_{1-x}$ Se $_x$、SrS $_{1-x}$ Te $_x$、MgS $_{1- x}$ O $_x$、MgS $_{1-x}$ Se $_x$和MgS $_{1-x}$ Te $_x$)。我们发现,在岩盐结构内的同构合金化是有利于所有系统,除了MgS $_{1-x}$ Te $_x$,这是预测的岩盐和纤锌矿结构之间的异质合金。S和Se的合金被证明是容易获得的所有阳离子与低的可溶解性临界温度,使连续调谐的电子性能在整个组合物空间。S和Te的合金具有更高的临界温度,但可以通过非平衡合成策略获得,并且在此预测具有用于光电子学的期望的电子性质,其具有比S和Se的合金更宽的带隙和更低的有效质量。MgS $_{1-x}$ Te $_x$中的阴离子合金化使纤锌矿结构在组成空间的显著部分上稳定,这可以使其作为透明导电材料特别感兴趣,因为其比岩盐结构更低的有效质量和更高的带隙。零点校正的无规相近似(RPA)的能量进行计算,以解决小的多晶型物的Mg化合物的能量差,并被证明…
Physical properties of transition metal hydride superconductors Mg2TmH6 (Tm = Rh, Pd, Ir, Pt) by first-principles calculations
Mawlana Bhashani Science and Technology University(毛拉纳·巴沙尼科技大学);University of Rajshahi(拉杰沙希大学);Rajshahi University of Engineering and Technology(拉杰沙希工程与技术大学)
Origin of high hardness and optoelectronic and thermo-physical properties of boron-rich compounds B6X (X = S, Se): a comprehensive study via DFT approach
First-principles insights into the optoelectronic and thermoelectric properties of X3NbY4(X= Cu, Ag, Au; Y=S, Se, Te) sulvanite compounds for energy applications
First-principles prediction of pressure dependent mechanical, electronic, optical, and superconducting state properties of NaC6: A potential high-Tc superconductor
Exploring Exciton and Polaron Dominated Photo-physical Phenomena in Ruddlesden-Popper Phases of Ban+1ZrnS3n+1 (n=[1-3]) from Many Body Perturbation Theory
$_{\textrm{n+1}}$ S $_{\textrm{n}}$(n=[1-3])的Ruddlesden-Popper(RP)相在光电子学领域,特别是在太阳能电池中被发展为一类新的有前途的硫属钙钛矿。然而,关于它的光学、激子、极化子和输运性质的详细研究迄今未知。本文在多体微扰理论的框架下,采用第一性原理方法研究了$_{\textrm{n+1}}$ $_{\textrm{n}}$ S $_{\textrm{3n+1}}$(n=[1-3])RP相中的激子和极化子效应.与体相不同,$_{\textrm{n+1}}$ $_{\textrm{n}}$(n=[1-3])RP相具有光学和激子各向异性。从Wannier-Mott的方法,我们表明,在RP相的这类硫属钙钛矿,捕获的离子的介电常数的贡献是重要的。我们报告显着的离子贡献和相对较小的电子-声子耦合常数的Ba $_{\textrm{n+1}}$ Zr $_\textrm{n}$ S $_{\textrm{3n+1}}$相比,散装BaZrS $_3$。激子的结合能被发现是依赖于大的电子-声子耦合的存在。电荷载流子迁移率在Ba $_2$ ZrS $_4$中是最大的,采用相同的变形势计算。根据我们的分析,光学声子模式被观察到占主导地位的声学声子模式,导致极化子迁移率的减少增加n在Ba $_{\textrm{n+1}}$ Zr $_{\text…