Controlled Synthesis of Tuned Bandgap Nanodimensional Alloys of PbSxSe1−x

Akhtar, Javeed; Afzaal, Mohammad; Bański, Mateusz; Podhorodecki, A.; Syperek, M.; Misiewicz, J.; Bangert, U.; Hardman, Samantha J. O.; Graham, D. M.; Flavell, Wendy R.; Binks, David J.; Gardonio, Sandra; O’Brien, Paul

doi:10.1021/ja200750s

Cited by 62 publications

(75 citation statements)

References 47 publications

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“…There is, therefore, a tremendous change between the bulk band gap and that obtained, indicating significant tuning. Alloy nanomaterials with semiconducting properties provide other alternatives for controlling band gaps in addition to the effects of size‐dependent quantum confinements and they give rise to materials with distinct properties . The alloy properties may vary with composition, which makes it possible to tune the band gap while keeping a constant size.…”

Section: Resultsmentioning

confidence: 99%

Hot‐Injection Synthesis of PbE (E= S, Se) Nanoparticles from Dichalcogenoimidophosphinato Lead (II) Complexes

et al. 2019

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Dichalcogenoimidodiphoshinato lead complexes, [Pb((EPiPr2)2N)2] (E=S, Se) have been synthesized and characterized. The crystal structure of [Pb((SeSPiPr2)2N)2]), has been solved by single‐crystal X‐ray crystallography and reported. These complexes have been used as single‐source precursors to synthesise PbS and PbSe nanoparticles by hot‐injection method in an oleylamine/trioctylphosphine mixture. Powder X‐ray diffraction (p‐XRD) studies indicate that the nanoparticles produced are cubic. The optical band gaps estimated from the absorption spectrum fitting curve indicate significant tuning of the bulk band gap, blue shifting towards the visible region of the electromagnetic spectrum.

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Section: Resultsmentioning

confidence: 99%

Hot‐Injection Synthesis of PbE (E= S, Se) Nanoparticles from Dichalcogenoimidophosphinato Lead (II) Complexes

et al. 2019

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“…3,5 As an additional degree of freedom in varying the chemical composition of chalcogenide-based materials, more than one chalcogenide species can be present in the lattice, for example S and Se. To date, several colloidal NCs of mixed metal ''sulfides-selenides'' have been reported, for example HgS y Se 1Ày , 6 ZnS y Se 1Ày , 7 SnS y Se 1Ày , 8 CdS y Se 1Ày , 9 PbS y Se 1Ày , 10 CuIn-(S y Se 1Ày ) 2 , 11 Cu x Fe 4 Sn 12 (S y Se 1Ày ) 32 12 and Cu 2 ZnSn(S y Se 1Ày ) 4 . 13 On the other hand, the ability to control the crystal phase and to obtain NCs in phases that were previously non-accessible is also quite relevant (see for example recent works on wurtzite Cu 2 ZnSnSe 4 and Cu 2 ZnSnS 4 NCs).…”

Section: Introductionmentioning

confidence: 99%

Colloidal Cu2−x(SySe1−y) alloy nanocrystals with controllable crystal phase: synthesis, plasmonic properties, cation exchange and electrochemical lithiation

et al. 2012

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Cubic and hexagonal phase Cu 2-x (S y Se 1-y ) alloy nanocrystals, with a well-defi ned near-infrared valence band plasmon resonance, were transformed in the corresponding Cd-based alloy nanocrystals, with the comparable S y Se 1-y stoichiometry, by cation exchange preserving the original crystal structure. Cubic Cu 2-x (S 0.5 Se 0.5 ) nanocrystals were then evaluated as anode material in Li-ion batteries. As featured in:See E. Dilena et al., J. Mater. Chem., 2012, 22 We report synthetic routes to both cubic and hexagonal phase Cu 2Àx (S y Se 1Ày ) alloy nanocrystals exhibiting a well-defined near-infrared valence band plasmon resonance, the spectral position of which is dependent mainly on x, i.e. on Cu stoichiometry, and to a lesser extent on the crystal phase of the NCs. For cubic Cu 2Àx (S y Se 1Ày ) nanocrystals y could be varied in the 0.4-0.6 range, while for hexagonal nanocrystals y could be varied in the 0.3-0.7 range. Furthermore, the Cu 2Àx (S y Se 1Ày ) nanocrystals could be transformed into the corresponding Cd-based alloy nanocrystals with comparable S y Se 1Ày stoichiometry, by cation exchange. The crystal phase of the resulting Cd(S y Se 1Ày ) nanocrystals was either cubic or hexagonal, depending on the phase of the starting nanocrystals. One sample of cubic Cu 2Àx (S y Se 1Ày ) nanocrystals, with S 0.5 Se 0.5 chalcogenide stoichiometry, was then evaluated as the anode material in Li-ion batteries. The nanocrystals were capable of undergoing lithiation/delithiation via a displacement/conversion reaction (Cu to Li and vice versa) in a partially reversible manner.

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“…There are many experimental studies for the mixture of PbS and PbSe compounds. For example Javeed Akhtar et al [2] have prepared Truly alloyed PbS x Se 1-x (x = 0-1) nanocrystals (∼5 nm in size), and their resulting optical properties are red-shifted systematically as the sulfur content of the materials increases. And Wanli Ma et al [3] have reported on Photovoltaic Devices Employing Ternary PbS x Se 1-x Nanocrystals, and they found that Photovoltaic devices made using ternary nanoparticles are more efficient than either pure PbS or pure PbSe based nanocrystal devices.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sulphur on structural and electrical properties of PbSxSe1-x films

Nasir¹,

K.Abas²,

J.Alatya³

2013

Int. J. Thin Film Sci. Tec.

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PbS x Se 1-x alloys with different S content (0,0.1,0.15,0.3,0.4,1) have been successfully prepared by evacuated quartz tube under vacuum pressure (10 -2 Toor). PbS x Se 1-x thin films have been prepared by thermal evaporation technique on glass substrate at room temperature (RT) under vacuum pressure 10 -5 mbar at deposition rate 5nm/sec .The effect of S content on some of the electrical properties has been studied.The structure of (PbS x Se 1-x ) alloys and films have been studied by X-ray diffraction technique. X-ray diffraction study shows that the Structure is polycrystalline with cubic Structure with preferential orientation in the (200) direction for films. From D.C measurements all films have shown two activation energies, the first at low temperature for activation energy E a2 and the second at high temperature for activation energy E a1 ,where these value decreases with increasing S content. And it is found that D.C conductivity decreased with increasing S content, while activation energy increases with increasing S content.. From the Hall measurement, the films of (X=0,0.1,0.15,0.3,0.4) are n-type and the films of (X=1) are p-type. Also the results showed that the carriers concentration decreases with increasing S content, but the Hall mobility µ H increased, and the value of R H ) decreased with increasing S content.

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Controlled Synthesis of Tuned Bandgap Nanodimensional Alloys of PbS_xSe_1−x

Cited by 62 publications

References 47 publications

Hot‐Injection Synthesis of PbE (E= S, Se) Nanoparticles from Dichalcogenoimidophosphinato Lead (II) Complexes

Hot‐Injection Synthesis of PbE (E= S, Se) Nanoparticles from Dichalcogenoimidophosphinato Lead (II) Complexes

Colloidal Cu2−x(SySe1−y) alloy nanocrystals with controllable crystal phase: synthesis, plasmonic properties, cation exchange and electrochemical lithiation

Influence of Sulphur on structural and electrical properties of PbSxSe1-x films

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