Tailoring band structure of ternary CdS Se1− quantum dots for highly efficient sensitized solar cells

Zhou, Ru; Wan, Lei; Niu, Haihong; Yang, Lin; Mao, Xinyu; Zhang, Qifeng; Miao, Shiding; Xu, Jinzhang; Cao, Guozhong

doi:10.1016/j.solmat.2016.04.049

Cited by 64 publications

(22 citation statements)

References 43 publications

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“…28 Solid solutions of CdS x Se 1-x are also known to exhibit large absorption shifts. 29 Copper zinc tin sulfide (CZST) 30 and Copper indium gallium selenide (CIGS) 31 thin films also exhibit a bandgap that is related to the cations stoichiometry and may vary in a broad range. Similar effect was observed on gallium indium oxide nanoparticles.…”

Section: Comparison With Other Class Of Compoundsmentioning

confidence: 99%

Band Gap Engineering from Cation Balance: The Case of Lanthanide Oxysulfide Nanoparticles

et al. 2019

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Among the inorganic compounds, many oxides and sulfides are known to be semiconductors. At the crossroads of these two families, oxysulfide M x O y S z compounds were much less investigated because they are scarce in nature and complex to synthesize. Among them, lanthanide oxysulfide Ln 2 O 2 S (Ln = lanthanide) are indirect band gap semiconductors, with wide gaps, except for Ce 2 O 2 S. (Gd,Ce) 2 O 2 S anisotropic nanoparticles with a hexagonal structure were obtained over the whole composition range and exhibit colors varying from white to brown with increasing Ce concentration. Band gap engineering is thus possible, from 4.7 eV for Gd 2 O 2 S to 2.1 eV for Gd 0.6 Ce 1.4 O 2 S, while the structure is preserved with a slight lattice expansion. Surprisingly, because of the limited thickness of the lamellar nanoparticles, the band gap of the nanoparticles is direct as validated by density functional theory on slabs. The fine control of the band gap over a wide range, solely triggered by the cation ratio, is rarely described in the literature and is highly promising for further development of this class of compounds. We propose a multiregime mechanism to rationalize the band gap engineering over the whole composition range. This should inspire the design of other bimetallic nanoscaled compounds, in particular, in the field of visible light photocatalysis.

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Section: Comparison With Other Class Of Compoundsmentioning

confidence: 99%

Band Gap Engineering from Cation Balance: The Case of Lanthanide Oxysulfide Nanoparticles

et al. 2019

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“…Due to the spatially graded bandgap within a single-alloy domain, such homojunctions provide a novel platform for versatile optoelectronic devices. Grading of stoichiometry induced graded bandgap has been introduced to zero-dimensional (0D) material based solar cells for energy harvesting [25,26]. Bandgap-graded one-dimensional (1D) alloys enabled by composition gradient have also been systemically investigated and showed competitive properties to conventional 1D materials [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Spatially Bandgap-Graded MoS2(1−x)Se2x Homojunctions for Self-Powered Visible–Near-Infrared Phototransistors

Zhu

Zou

et al. 2020

Nano-Micro Lett.

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HIGHLIGHTS • Due to the Se composition and thickness gradient within single MoS 2(1−x) Se 2x domains, the bandgap of MoS 2(1−x) Se 2x is gradually tuned from 1.83 to 1.73 eV. • The homojunction phototransistors at zero bias deliver a photoresponsivity of 311 mA W −1 , a specific detectivity up to ~ 10 11 Jones, and an on/off ratio up to ~ 10 4. • The biased devices yield a champion photoresponsivity of 191.5 A W −1 , a specific detectivity up to ~ 10 12 Jones, and a photoconductive gain of 10 6-10 7 .

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“…Even though the particle size distribution remains similar, the variation in absorption spectra is due to the change in the composition of the nanocrystals. 44,45 The optical band gaps of the nanocrystals are obtained from the Tauc plot (Fig. 3b).…”

Section: Composition-dependent Optical Propertiesmentioning

confidence: 99%

Single-Component White Light Emitting CdSexSy Alloy Nanocrystals Through Phosphine-Free Route

Jaiswal¹,

Pathak²,

Patra

2020

Preprint

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Semiconductor nanocrystals are promising for display and lighting devices. Herein, we report a facile one-pot synthetic route to fabricate white light emitting CdSexSy nanocrystals with enhanced quantum yield using CdO, S powder, and Se powder as precursors. The phosphine-free route was adopted, employing paraffin oil as the reducing agent and solvent for the fabrication. The optical properties can be effectively tailored by controlling the reaction time and the molar ratio of Se/S. The emission of pristine CdSexSy nanocrystals covered a broad visible range from 400 to 750 nm. The CdSexSy nanocrystals (Se/S = 0.4) exhibited white-light emission with quantum yield of 50 ± 3 % and Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of (0.30, 0.31). The band-edge (~400-450 nm) to trap-state (~550-750 nm) emissions was tuned by controlling the Se/S ratio, and the different shades of white light were obtained. Furthermore, the quantum yield and CIE coordinates of the CdSexSy nanocrystals (Se/S = 0.4) were found to be similar even after 30 days of fabrication, showing the high stability of nanocrystals. The white light emission was retained in nanocrystals-embedded poly(methyl methacrylate) (PMMA) thin film and also in the hydrogel matrix. The one-pot, low-cost, scalable fabrication of white light emitting CdSexSy nanocrystals demonstrated in the present study offers promising scope in the solid-state display applications. <br>

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Tailoring band structure of ternary CdS Se1− quantum dots for highly efficient sensitized solar cells

Cited by 64 publications

References 43 publications

Band Gap Engineering from Cation Balance: The Case of Lanthanide Oxysulfide Nanoparticles

Band Gap Engineering from Cation Balance: The Case of Lanthanide Oxysulfide Nanoparticles

Spatially Bandgap-Graded MoS2(1−x)Se2x Homojunctions for Self-Powered Visible–Near-Infrared Phototransistors

Single-Component White Light Emitting CdSexSy Alloy Nanocrystals Through Phosphine-Free Route

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