Untitled

doi:10.1002/adom.v7.8

Cited by 14 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the strong SOC interactions induced energy level splitting of the Bi 6p states will give rise to the decrease of the CBM position and the reduction of the band gap. Replacing Cl by I significantly lower the CBM and raise the VBM due to the interaction between Bi 3+ and I ions, [11] resulting in the band gap shrinkage from 3.41 eV (Cs 2 NaBiCl 6 ) [29] to 1.66 eV (Cs 2 NaBiI 6 ). [31] The mobility of the carriers is one key parameter for optoelectronic applications.…”

Section: Electronic Structure and Optical Propertiesmentioning

confidence: 99%

“…[24][25][26] Alternatively, Cs 2 NaBiCl 6 possesses an indirect band gap of 3.41 eV and shows adjustably photoelectric properties by various ion doping. [27][28][29][30] A bright orange-red phosphor has been achieved by doping Mn 2+ ions into Cs 2 NaBiCl 6 host, and a red shift of the optical absorption and excitation spectra has been observed through further chemical substitution of Cl − ions with Br − ions. [28] The indirect band gap can change to direct one by gradual substitution of Bi 3+ with In 3+ in Cs 2 NaBiCl 6 , and a strong orange-yellow photoluminescence was observed when doped with Mn 2+ , and can be manipulated by the Bi 3+ /In 3+ ratios.…”

Section: Introductionmentioning

confidence: 99%

“…[28] The indirect band gap can change to direct one by gradual substitution of Bi 3+ with In 3+ in Cs 2 NaBiCl 6 , and a strong orange-yellow photoluminescence was observed when doped with Mn 2+ , and can be manipulated by the Bi 3+ /In 3+ ratios. [29] In addition, Cs 2 NaBiCl 6 nanocrystals with different concentrations of doped ions have been synthesized, which show the excitonic absorption energy shifting from 3.82 eV to 3.48 eV by Ag + ions doping, leading to a significant improvement of photoluminescence quantum yield from 1.7% to 20%. [30] Recently, another novel halide DP material of Cs 2 NaBiI 6 has been synthesized for the first time by hydrothermal reaction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stability and optoelectronic property of lead-free halide double perovskite Cs₂ B′BiI₆ (B′ = Li, Na and K)*

et al. 2021

View full text Add to dashboard Cite

Although lead-based perovskite solar cells have achieved more than 25% power conversion efficiency, the toxicity of lead and instability are still urgent problems faced in industrial application. Lead-free halide double perovskite (DP) materials are promising candidates to resolve these issues. Based on the density functional theory, we explore the geometric stability, thermodynamic stability, mechanical stability, electronic structures, and optical properties of the Cs 2 B BiI 6 (B = Li, Na and K) DP materials. By analyzing the tolerance factor and octahedral factor, we find the geometric stabilities of Cs 2 NaBiI 6 and Cs 2 KBiI 6 DPs are better than Cs 2 LiBiI 6 . By calculating the total energy, formation energy and decomposition energy, we propose that the most favorable structure of Cs 2 B BiI 6 is the orthorhombic phase, and Cs 2 LiBiI 6 is less stable relative to the other two counterparts from an energetic viewpoint. Mechanical stability evaluations reveal that the orthorhombic Cs 2 LiBiI 6 material is less stable relative to the isostructural Cs 2 NaBiI 6 and Cs 2 KBiI 6 DPs. The mechanical property calculations indicate that the Cs 2 B BiI 6 DPs possess good ductility, which can be used as flexible materials. Electronic structures and optical property calculations show that the orthorhombic Cs 2 B BiI 6 DPs have suitable band gap values, weaker exciton binding energies, and excellent optical absorption performance in the visible-light range. Based on the above comprehensive assessments, we can conclude that the orthorhombic Cs 2 NaBiI 6 and Cs 2 KBiI 6 DPs with good stability are promising candidates for solar cell applications.

show abstract

Section: Electronic Structure and Optical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability and optoelectronic property of lead-free halide double perovskite Cs₂ B′BiI₆ (B′ = Li, Na and K)*

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Recently, bubbles of monolayer or few layers 2D materials are created via various method and investigated in physics, chemistry, and devices. [1,5,16,17] A biaxial strain in bubbles can cause the direct-to-indirect band gap transition of few-layer TMDCs. [18] Strain localization excitons states formed a doughnut-like pattern around the nanoscale bubbles of monolayer WSe 2 and MoS 2 at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Photoluminescence (PL) and Raman spectra oscillations can be found across graphene, monolayer WS 2 , and few layer WSe 2 bubble profile due to light interference. [1,11,16] In addition, PL of monolayer WS 2 is sensitive with strain, electric filed, and temperature. Monolayer WS 2 has a potential application for photodetectors due to strong PL with narrower emission bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Photoemission oscillation in epitaxially grown van der Waals β-In₂Se₃WS₂ heterobilayer bubbles*

Dong

Lin

et al. 2021

Chinese Phys. B

View full text Add to dashboard Cite

Thin films of millimeter-scale continuous monolayer WS2 have been grown on SiO2/Si substrate, followed by the deposition of β-In2Se3 crystals on monolayer WS2 to prepare In2Se3/WS2 van de Waals heterostructures by a two-step chemical vapor deposition (CVD) method. After the growth of In2Se3 at elevated temperatures, high densities of In2Se3/WS2 heterostructure bubbles with monolayer to multilayer β-In2Se3 crystals atop are observed. Fluorescence of the resultant β-In2Se3/WS2 heterostructure is greatly enhanced in intensity upon the formation of bubbles, which are evidenced by the Newton’s rings in optical image owing to constructive and destructive interference. In photoluminescence (PL) mapping images of monolayer β-In2Se3/monolayer WS2 heterobilayer bubble, significant oscillatory behavior of emission intensity is demonstrated due to constructive and destructive interference. However, oscillatory behaviors of peak position are also observed and come from a local heating effect induced by an excitation laser beam. The oscillatory mechanism of PL is further verified by changing the exterior pressure of bubbles placed in a home-made vacuum chamber. In addition, redshifted in peak position and broadening in peak width are observed due to strain effect during decreasing the exterior pressure of bubbles.

show abstract

Terahertz radiation generation by beating of two chirped laser pulses in a warm collisional magnetized plasma

Arefnia¹,

Sharifian²,

Ghorbanalilu³

2021

Chinese Phys. B

View full text Add to dashboard Cite

Analytical equations of terahertz (THz) radiation generation based on beating of two laser beams in a warm collisional magnetized plasma with a ripple density profile are developed. In this regard, the effects of frequency chirp on the field amplitude of the terahertz radiation as well as the temperature and collision parameters are investigated. The ponderomotive force is generated in the frequency chirp of beams. Resonant excitation depends on tuning of the plasma beat frequency, magnetic field frequency, thermal velocity, collisional frequency, and effect of the frequency chirp with the plasma density. For optimum parameters of frequency and temperature the maximum THz amplitude is obtained.

show abstract

Untitled

Cited by 14 publications

References 0 publications

Stability and optoelectronic property of lead-free halide double perovskite Cs₂ B′BiI₆ (B′ = Li, Na and K)*

Stability and optoelectronic property of lead-free halide double perovskite Cs₂ B′BiI₆ (B′ = Li, Na and K)*

Photoemission oscillation in epitaxially grown van der Waals β-In₂Se₃WS₂ heterobilayer bubbles*

Terahertz radiation generation by beating of two chirped laser pulses in a warm collisional magnetized plasma

Contact Info

Product

Resources

About

Untitled

Cited by 14 publications

References 0 publications

Stability and optoelectronic property of lead-free halide double perovskite Cs2 B′BiI6 (B′ = Li, Na and K)*

Stability and optoelectronic property of lead-free halide double perovskite Cs2 B′BiI6 (B′ = Li, Na and K)*

Photoemission oscillation in epitaxially grown van der Waals β-In2Se3WS2 heterobilayer bubbles*

Terahertz radiation generation by beating of two chirped laser pulses in a warm collisional magnetized plasma

Contact Info

Product

Resources

About

Stability and optoelectronic property of lead-free halide double perovskite Cs₂ B′BiI₆ (B′ = Li, Na and K)*

Stability and optoelectronic property of lead-free halide double perovskite Cs₂ B′BiI₆ (B′ = Li, Na and K)*

Photoemission oscillation in epitaxially grown van der Waals β-In₂Se₃WS₂ heterobilayer bubbles*