X-ray photoelectron spectra and electronic structure of some diamine compounds

Lee, Ting Ho; Rabalais, J. W.

doi:10.1016/0368-2048(77)85052-4

Cited by 74 publications

(29 citation statements)

References 6 publications

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“…Species 2 has been ascribed to the unreacted thiourea present in the material and the relatively higher value of binding energy for the S 2p 3/2 peaks at ~162.3 eV (for the =S in C(NH)2S) match with the values reported for thiourea [40,41]. In addition it was observed that in all three samples, even after argon ion sputtering, the signal for nitrogen persists and its intensity increases from S1 to S3.…”

Section: Sulfur Variation (Samples S1-s3)supporting

confidence: 75%

A low-cost, sulfurization free approach to control optical and electronic properties of Cu2ZnSnS4 via precursor variation

Gupta

Whittles

Batra

et al. 2016

Solar Energy Materials and Solar Cells

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Thin films of Cu2ZnSnS4 (CZTS) were synthesized via a low cost, wet chemical technique of chemical bath deposition (CBD). In the first part of this study, the chemical composition ratio S/(Cu+Zn+Sn) was varied keeping Cu/(Zn + Sn) and Zn/Sn ratios constant to study the effect of sulfur variation. Detailed electrical and optical characterization has been carried out using UV-Vis spectroscopy, x-ray diffraction, x-ray photoelectron spectroscopy, Raman spectroscopy and Kelvin probe force microscopy (KPFM) techniques. The results of the present study confirm that near ideal stoichiometry could be achieved in CZTS by adding excess thiourea in a controlled manner which eliminates the need for the normally used post-synthesis and high temperature sulfurization step. Using the stoichiometric sample as the basis, in the second part of the study Cu/(Zn+Sn) and Zn/Sn was varied and it was found that the electronic properties of CZTS in terms of band gap, work function and valence band edge position could be controlled by precursor variation. The Cu-poor, Zn-rich samples showed a better photoresponse which has been attributed to a decrease in the CuZn type defects. The study thus demonstrates a scalable and low-cost technique to grow CZTS absorber layers for solar cells with control over its electronic properties which is important for effective device operation.

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Section: Sulfur Variation (Samples S1-s3)supporting

confidence: 75%

A low-cost, sulfurization free approach to control optical and electronic properties of Cu2ZnSnS4 via precursor variation

Gupta

Whittles

Batra

et al. 2016

Solar Energy Materials and Solar Cells

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show abstract

“…Towards the end of the spectral suite, the spectrum was similar, but the linewidth was slightly broader (1.1 eV). The binding energy of the principal doublet was close to that expected for a >C@S functional group adjacent to an ether and amine group based on the values of 162.0 and 162.4 eV observed for thiourea (Lee and Rabalais, 1977;Srinivasan and Walton, 1977).…”

Section: Xps Characterisation Of Frozen Commercial Ipetc Collectormentioning

confidence: 61%

“…The assignment is also supported by the 13 C NMR spectra for HIPETC dissolved in chloroform (Woods and Hope, 1999). Observed values for the C 1s binding energy in thiourea, H 2 NAC(@S)ANH 2 , have been 288.0 and 288.1 eV (Lee and Rabalais, 1977;Srinivasan and Walton, 1977). The highest binding energy component at 288.4 eV from C bonded to the S, O and protonated N is observed at a significantly lower binding energy ($287.4 eV) in the deprotonated adsorbate (Section 3.3).…”

Section: Xps Characterisation Of Frozen Commercial Ipetc Collectormentioning

confidence: 92%

Adsorption of O-isopropyl-N-ethyl thionocarbamate on Cu sulfide ore minerals

Buckley

Hope

Lee

et al. 2014

Minerals Engineering

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“…The O 1s oxidation state at 530.9 eV is indicative of C–O and C–N bonded groups to the C-dots, which is also observed by Kumar et al [ 78 ]. The binding energy peak center at 399.3 eV, which is observed in this sample, is indicative of the presence of amine (–NH 2 ) groups [ 79 ]. Based on the relative, deconvoluted peak area ratios of the C 1s level, the percentages of C=C and C–O/C–N carbon are 74.7% and 25.3%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

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Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

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X-ray photoelectron spectra and electronic structure of some diamine compounds

Cited by 74 publications

References 6 publications

A low-cost, sulfurization free approach to control optical and electronic properties of Cu2ZnSnS4 via precursor variation

A low-cost, sulfurization free approach to control optical and electronic properties of Cu2ZnSnS4 via precursor variation

Adsorption of O-isopropyl-N-ethyl thionocarbamate on Cu sulfide ore minerals

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

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