Influence of Mn doping on structural and optical properties of CdS nanoparticles

Devi, L. Sujata; Devi, K. Nomita; Sharma, B. Indrajit; Sarma, H. N. K.

doi:10.1007/s12648-013-0436-8

Cited by 16 publications

(10 citation statements)

References 26 publications

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“…Absorption edge showed a slight blue shift for doped QDs. This slight shifting in absorption edge can be attributed to the quantum confinement effect produced due to increased nucleation rate with doping as observed previously in other works [14] (Fig. 4 and 5).…”

Section: Resultssupporting

confidence: 84%

Cu‐doped CdS QDs for sensitisation in solar cell

Ganguly¹,

Nath

Choudhury³

2018

Micro & Nano Letters

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Copper (Cu)-doped cadmium sulphide (CdS) quantum dots (QDs) sensitised zinc oxide photoelectrodes have been fabricated for a solar cell (SC). For the synthesis of QDs, simple chemical methods have been adapted and the QDs were prepared on poly-vinyl alcohol capping agent. The influences of doping on structural properties of QDs have been studied using X-ray diffraction analysis and transmission electron microscopy images. Ultraviolet-visible absorption spectroscopy reveals an enhanced optical absorption in doped QDs. The photovoltaic performance of the Cu-doped CdS QDs was studied by measuring the current density-voltage (J-V) characteristics of the fabricated SC. An enhanced photo-conversion efficiency was observed in doped CdS QDs compared with the undoped QDs sensitised SC.

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Section: Resultssupporting

confidence: 84%

Cu‐doped CdS QDs for sensitisation in solar cell

Ganguly¹,

Nath

Choudhury³

2018

Micro & Nano Letters

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“…This may correspond to the QD dimension decreasing predominantly in directions perpendicular to the (220) particular planes where the unit cell l is equal to zero. Interestingly, the 16 min sample's diffraction peak FWHM remained constant for each peak, implying that the anisotropic broadening in Mn-doped CdSe QDs is less dependent on the size of the QDs [20][21][22]. The lattice parameter analyzed from XRD analysis ( Table 1) showed an increasing pattern as a function of QD size.…”

Section: Resultsmentioning

confidence: 94%

“…This may explain the strain inhomogeneity shown in Figures 4-11. Furthermore, the Mn 2+ dopant in the CdSe QD lattice may induce either compressive or/and expansion stress in the lattice, resulting in strain inhomogeneity in Mn-doped CdSe QDs [21]. The overall lattice strain (η 1 ) in Figure 12 shows a decreasing trend with the growth of Mn-doped CdSe QDs.…”

Section: Resultsmentioning

confidence: 99%

Lattice Strain Analysis of a Mn-Doped CdSe QD System Using Crystallography Techniques

et al. 2019

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In this work, we report on the different sizes of manganese-doped cadmium selenide quantum dots (Mn-doped CdSe QDs) synthesized for 0 to 90 min using a reverse micelle organic solvent method and surfactant having a zinc blende structure, with physical size varying from 3 to 14 nm and crystallite size from 2.46 to 5.46 nm and with a narrow size distribution. At similar reaction times, Mn-doped CdSe QDs displayed the growth of larger QDs compared with the pure CdSe QDs. Due to the implementation of lattice strain owing to the inclusion of Mn atoms in the CdSe QD lattice, the lattice parameter was compressed as the QD size increased. Strain was induced by the particle size reduction, as observed from X-ray diffractometer (XRD) analysis. The analyses of the strain effect on the QD reduction are discussed relative to each of the XRD characteristics.

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“…Besides, increases in the energy band gap were inversely proportional to the QDs. To elaborate further, Equation (2) shows that the relationship between the energy band gap (E) and the carrier effective mass (m * ) are also inversely proportional, whereh and k are constants factors.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, like many other QDs, CdSe QDs have a large surface area, resulting in larger surface energy. Therefore, it is volatile or metastable thermodynamically [2]. Researchers have made considerable effort to address this issue by incorporating dopants into the surface of CdSe QDs [3].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Surface Properties of Mn-Doped CdSe Quantum Dots Studied by X-ray Photoelectron Spectroscopy

et al. 2019

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In this work, we report on the effects of incorporating manganese (Mn) dopant into different sizes of cadmium selenide (CdSe) quantum dots (QDs), which improves the electronic and optical properties of the QDs for multiple applications such as light-emitting diodes, lasers, and biological labels. Furthermore, the greener inverse Micelle method was implemented using organic ligand, which is oleic acid. This binding of the surface enhanced the QDs’ surface trap passivation of Mn-doped CdSe, which then increased the quantity of the output. In addition, the inverse Micelle technique was used successfully to dope Mn into CdSe QDs without the risk of Mn dopants being self-purified as experienced by wurtzite CdSe QDs. Also, we report the X-ray photoelectron spectroscopy (XPS) results and analysis of zinc blended manganese-doped cadmium selenide quantum dots (Mn-doped CdSe QDs), which were synthesized with physical sizes that varied from 3 to 14 nm using the inverse Micelle method. The XPS scans traced the existence of the Se 3d and Cd 3d band of CdSe crystals with a 54.1 and 404.5 eV binding energy. The traced 640.7 eV XPS peak is proof that Mn was integrated into the lattice of CdSe QDs. The binding energy of the QDs was related to the increase in the size of the QDs.

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Influence of Mn doping on structural and optical properties of CdS nanoparticles

Cited by 16 publications

References 26 publications

Cu‐doped CdS QDs for sensitisation in solar cell

Cu‐doped CdS QDs for sensitisation in solar cell

Lattice Strain Analysis of a Mn-Doped CdSe QD System Using Crystallography Techniques

Investigation on Surface Properties of Mn-Doped CdSe Quantum Dots Studied by X-ray Photoelectron Spectroscopy

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