Influence of substrates on the structural and optical properties of ammonia-free chemically deposited CdS films

Cao, Meng; Li, L.; Zhang, B.L.; Huang, Jihua; Tang, Ke; Cao, Hu; Sun, Yan; Shen, Yue

doi:10.1016/j.jallcom.2012.03.054

Cited by 34 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structural analysis confirms that the substrate has significant impact on the crystal structure of CdS thin films. Comparable results showing the effect of substrates on the properties of the CdS thin films were reported by [21][22][23][24]40].…”

Section: Structural Studiessupporting

confidence: 66%

Untitled

2021

Int. J. Thin. Fil. Sci. Tec.

View full text Add to dashboard Cite

In this work multilayer films of CdS/ZnS and CdS/CoS were prepared using the chemical bath deposition technique. The influence of substrate materials on structural, morphological, compositional and optical properties of the films was investigated. The powder X-ray diffraction (XRD) pattern of CdS/ZnS thin film showed nearly similar structure to that of the cubic ZnS structure. The XRD pattern of CdS/CoS thin films confirmed the co-existence of hexagonal and orthorhombic CdS phases. A cubic CdS structure is observed for CdS/glass thin film. The scanning electron microscopy (SEM) micrograph of CdS/glass film revealed spherical grains of size 125 nm covering the substrate uniformly without voids and cracks. The as large grain size as 800 nm with distinct grain boundaries was observed for CdS/ZnS multilayer film with some voids on the surface. The SEM micrograph of CdS/CoS thin film showed spherical surface grains of size 450 nm on flat and compact background. The energy dispersive X-ray spectra of single and multilayer CdS films confirmed the presence of Cd and S. The optical analysis of the CdS/glass, CdS/ZnS and CdS/CoS thin films confirmed band gaps of 2.5, 2.3 and 2.27 eV respectively.

show abstract

Section: Structural Studiessupporting

confidence: 66%

Untitled

2021

Int. J. Thin. Fil. Sci. Tec.

View full text Add to dashboard Cite

show abstract

“…[ 26 ] As shown in Figure , Zn 0.38 Cd 0.62 S cores present distinctive peaks at 310 cm –1 and around 603 cm –1 , which corresponds to 1‐LO (longitudinal optical) and 2‐LO phonon mode, respectively, keeping in accordance with previous reports. [ 27,28 ] With the deposition of the initial four ZnS monolayers, the LO phonon modes of C/S QDs gradually shift to higher energy owing to the interface alloying. As ZnS shell is further deposited, the shift of the phonon mode can be negligible.…”

Section: Resultsmentioning

confidence: 99%

Low‐Threshold Amplified Spontaneous Emission in Blue Quantum Dots Enabled by Effectively Suppressing Auger Recombination

Wang

et al. 2021

Advanced Optical Materials

View full text Add to dashboard Cite

The amplified spontaneous emissions in blue quantum dots (QDs) are still constrained by their high thresholds due to the challenge in engineering alloyed core–shell interface in the QDs with a wide bandgap to suppress Auger recombination. Compared with their red and green counterparts, the larger reactivity difference between the alloyed shell precursors makes it hard to regulate the composition and structure of the shell, and the smaller potential barrier between the core and the alloyed shell in blue QDs renders charge carriers tunneling into surface defects easier. Here, we employ a Lewis soft base ligand, 1‐decanethiol, to balance the mismatched reactivity between Zn and Cd precursors for crafting a thick gradient alloyed shell with gradually increased potential barrier, which can not only restrict the charge carriers tunneling but also smooth the confinement potential. As a result, the resulting blue QDs show a long Auger lifetime of 1.3 ns, and a low threshold of 6.9 µJ cm−2 excited by a femtosecond laser, which is the record value among all reported blue‐emitting nanocrystals and comparable to those of state‐of‐the‐art red and green QDs.

show abstract

“…Raman peaks ob- served at about 302 cm −1 are corresponding to 1LO and the peak observed at about 600 cm −1 is corresponds to 2LO. The position of 1LO peak of bulk sample was reported as 305 cm −1 [28] . The reduced LO phonon energy is characterized by lattice softening of CdS thin films [29] .…”

Section: Photoluminescence Studymentioning

confidence: 99%