Electronic structure and optical properties of CdSxSe1−x solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

Murphy, Michael W.; Yiu, Yun Mui; Ward, Matthew J.; Liu, Liwang; Hu, Yongfeng; Zapien, Juan Antonio; Liu, Yingkai; Sham, T. K.

doi:10.1063/1.4902390

Cited by 16 publications

(17 citation statements)

References 64 publications

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“…By avoiding complications due to charge extraction, it can provide insight more specifically regarding the local semiconductor quality. [110,111] As such, XEOL is valuable for understanding defects and carrier recombination mechanisms. [112] XEOL is distinguished from photoluminescence (PL) by the energy of the incident beam.…”

Section: Xbic and Xeol Operationmentioning

confidence: 99%

X‐Ray Microscopy of Halide Perovskites: Techniques, Applications, and Prospects

Kodur

Kumar

Luo

et al. 2020

Advanced Energy Materials

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X-ray microscopy can provide unique chemical, electronic, and structural insights into perovskite materials and devices leveraging bright, tunable synchrotron X-ray sources. Over the last decade, fundamental understanding of halide perovskites and their impressive performance in optoelectronic devices has been furthered by rigorous research regarding their structural and chemical properties. Herein, studies of perovskites are reviewed that have used X-ray imaging, spectroscopy, and scattering microscopies that have proven valuable tools toward understanding the role of defects, impurities, and processing on perovskite material properties and device performance. Together these microscopic investigations have augmented our understanding of the This article is protected by copyright. All rights reserved. 2 internal workings of perovskites and help steer the perovskite community toward promising directions. In many ways, X-ray microscopy of perovskites is still in its infancy, which leaves many exciting paths unexplored including new super-resolution, multimodal, in situ, and operando experiments. To explore possibilities, pioneering X-ray microscopy along these lines is briefly highlighted from other semiconductor systems including silicon, CdTe, GaAs, CuIn x Ga 1-x Se 2 , and organic photovoltaics. An overview is provided on the progress made in utilizing X-ray microscopy for perovskites and present opportunities and challenges for future work.

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Section: Xbic and Xeol Operationmentioning

confidence: 99%

X‐Ray Microscopy of Halide Perovskites: Techniques, Applications, and Prospects

Kodur

Kumar

Luo

et al. 2020

Advanced Energy Materials

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“…However, the proportional variation is an approximation. In isostructural semiconductors, such as CdS ( E g , 2.43 eV) and CdSe (1.74 eV), both being hexagonal, a “bowing parameter” is required to elucidate the E g of a material of intermediate composition [ 32,33 ]

E_{normalg} ({CdS}_{y} {Se}_{1 - y}) = y E_{normalg} (CdS) + (1 - y) E_{normalg} (CdSe) - y (1 - y) β

…”

Section: Methodsmentioning

confidence: 99%

Systematic Variation of Material Characteristics with Chemical Composition in Antimony Sulfide Selenide Thin Films and Its Relevance to Solar Cell Performance

Bray-Sánchez

Nair

2021

Physica Status Solidi (a)

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Antimony sulfide (Sb2S3) and antimony selenide (Sb2Se3), with optical bandgaps (Eg) of 1.88 and 1.1 eV, respectively, both crystallize in the orthorhombic structure and can produce Sb2SxSe3–x of intermediate Eg for solar cells. Herein, powder sources of Sb2S3 and Sb2Se3 in different mass ratios in vacuum thermal evaporation are used to produce Sb2SxSe3–x thin films of thickness 455 nm. These films show a systematic variation in their characteristics with x—A, Sb2S2.05Se0.95 (Eg, 1.51 eV); B, Sb2S1.71Se1.29 (1.44 eV); C, Sb2S1.24Se1.76 (1.40 eV); D, Sb2S0.64Se2.36 (1.32 eV); and E, Sb2S0.44Se2.56 (1.29 eV)—in the light‐generated current density, and in their photoconductivity. Solar cells of SnO2:F/CdS(100 nm)/Sb2SxSe3–x(455 nm)/C‐Ag with Sb2SxSe3–x films of compositions A–E show open circuit voltages (Voc) of 0.566–0.418 V; short circuit current densities of 9.65–31.5 mA cm−2; fill factors of 0.38–0.52; and conversion efficiencies (η) of 2.1–6.8%. Seven series‐connected solar cells of E 7 cm2 in area produce 34.2 mW with Voc of 2.83 V and η 4.88%. In view of their operational stability and the material perspectives of Sb2SxSe3–x, considerations considerations to improve these solar cells are discussed.

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“…CdS and CdSe form a complete solution, the main phase determined by XRD has a wurtzite structure with lattice parameters (a=b=4.19Å and c=6.82Å) matching a composition close to x=0.79. The colour ranges from yellow (pure CdS), to orange for x=0.81, red for x=0.65 and brown for x=0.25 [19]. The chemical composition of the cadmium sulphide selenide particles has been defined by SEM-EDS.…”

Section: La-icp-ms Data Of the Purple Enamels (E14 And E107mentioning

confidence: 99%

“…The composition is adequate to obtain a red ruby colour at a temperature close to the enamels firing temperature (≈590 o C). Higher firing temperatures favour the formation of crystals richer in Se, and lower firing temperatures produce crystals richer in S [19].…”

Section: La-icp-ms Data Of the Purple Enamels (E14 And E107mentioning

confidence: 99%

Modernist enamels: Composition, microstructure and stability

Beltrán

Schibille

Brock

et al. 2020

Journal of the European Ceramic Society

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Coloured enamels from the materials used in Modernist workshops from Barcelona were produced and compared to those found in the buildings to explore the reason for the reduced stability of the blue and green enamels.They were made of a lead-zinc borosilicate glass with a low softening point, reasonable stability to corrosion and matching thermal expansion coefficient with the blown base glass, mixed with colourants and pigment particles. The historical enamels show a lead, boron and zinc depleted silica rich amorphous glass, with precipitated lead and calcium sulphates or carbonates, characteristic of extensive atmospheric corrosion. The blue and green enamels show a heterogeneous layered microstructure more prone to degradation which is augmented by a greater heating and thermal stress affectation produced by the enhanced Infrared absorbance of blue tetrahedral cobalt colour centres and copper ions dissolved in the glass and, in particular, of the cobalt spinel particles.

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Electronic structure and optical properties of CdSxSe1−x solid solution nanostructures from X-ray absorption near edge structure, X-ray excited optical luminescence, and density functional theory investigations

Cited by 16 publications

References 64 publications

X‐Ray Microscopy of Halide Perovskites: Techniques, Applications, and Prospects

X‐Ray Microscopy of Halide Perovskites: Techniques, Applications, and Prospects

Systematic Variation of Material Characteristics with Chemical Composition in Antimony Sulfide Selenide Thin Films and Its Relevance to Solar Cell Performance

Modernist enamels: Composition, microstructure and stability

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