X-ray photoelectron spectroscopy and auger electron spectroscopy studies of Al-doped ZnO films

Chen, M; Wang, X; Yu, Yang; Pei, Zhibin; Bai, Xiaoyan; Sun, Chao; Huang, Rong; Wen, Liping

doi:10.1016/s0169-4332(99)00601-7

Cited by 1,262 publications

(638 citation statements)

References 16 publications

Supporting

Mentioning

581

Contrasting

Unclassified

Order By: Relevance

“…The presence of oxygen species such as -OH, -CO, adsorbed H 2 O and/or O 2 on the surface generally produces a peak at 532.3 eV. [53][54][55] Similar to the earlier case, the O 1s spectrum of ZnO (TiO 2 -ZnO CSHJ) can be deconvoluted into two peaks as shown in Fig. 5.…”

Section: Photocatalytic Activity Of Core-shell Heterojunction Nanobersmentioning

confidence: 54%

“…[53][54][55] Due to the fact that TiO 2 and ZnO possess typical oxygen related defects, the defect sites are subjected to the chemisorption of the above ions while sharing the lattice electron(s). [53][54][55] Furthermore, the grain boundaries (as seen in the TEM images) are obvious locations for electron decient species to chemisorb. Depending on the availability of free electron(s), the sharing can be partial with the above species which has produced relatively broad binding energies peaking at $532.2 eV or $531.9 eV.…”

Section: Photocatalytic Activity Of Core-shell Heterojunction Nanobersmentioning

confidence: 99%

See 1 more Smart Citation

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

et al. 2014

View full text Add to dashboard Cite

Heterojunctions are a well-studied material combination in photocatalysis studies, the majority of which aim to improve the efficacy of the catalysts. Developing novel catalysts begs the question of which photo-generated charge carrier is more efficient in the process of catalysis and the associated mechanism. To address this issue we have fabricated core-shell heterojunction (CSHJ) nanofibers from ZnO and TiO 2 in two combinations where only the 'shell' part of the heterojunction is exposed to the environment to participate in the photocatalysis. Core and shell structures were fabricated via electrospinning and atomic layer deposition, respectively which were then subjected to calcination. These CSHJs were characterized and studied for photocatalytic activity (PCA). These two combinations expose electrons or holes selectively to the environment. Under suitable illumination of the ZnO-TiO 2 CSHJ, e/h pairs are created mainly in TiO 2 and the electrons take part in catalysis (i.e. reduce the organic dye) at the conduction band or oxygen vacancy sites of the 'shell', while holes migrate to the core of the structure. Conversely, holes take part in catalysis and electrons diffuse to the core in the case of a TiO 2 -ZnO CSHJ. The results further revealed that the TiO 2 -ZnO CSHJ shows $1.6 times faster PCA when compared to the ZnO-TiO 2 CSHJ because of efficient hole capture by oxygen vacancies, and the lower mobility of holes.

show abstract

Section: Photocatalytic Activity Of Core-shell Heterojunction Nanobersmentioning

confidence: 54%

Section: Photocatalytic Activity Of Core-shell Heterojunction Nanobersmentioning

confidence: 99%

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

et al. 2014

View full text Add to dashboard Cite

show abstract

“…We also found in Figure 4(a) and 4(b) that the component O3 ascribed to chemisorbed oxygen can not be removed by annealing even at temperatures as high as 500 o C. As mentioned before, O3 is usually ascribed to the specific chemisorbed oxygen, such as -CO 3 , adsorbed O 2 or adsorbed H 2 O [26][27][28][29][30][31][32][33][34][35]. In Figure 4 it can be observed that the binding energy of the O3 peak shifts from 532.87±0.3 eV to 532.28 ±0.3 eV and the FWHM also decreased from 2.01 eV to 1.60 eV after annealing.…”

Section: Resultsmentioning

confidence: 86%

“…The peak position of O3 can vary depending on adsorbant, e.g. from 532.25 eV [29] to 533.21 eV [35], and the exact energy position depended on the relative ratio between the different components involved in O3 peak due to the growth process [26][27][28][29][30][31][32][33][34][35].…”

Section: Resultsmentioning

confidence: 99%

“…Although some groups have reported the possible functional groups attached in the surface of the ZnO [25][26][27][28][29][30][31][32][33][34][35], so far, there are no investigations which try to build the relationship between the chemical origin and surface recombination centers. On the basis of the discussion in the first paragraph, we believe that the investigation on identifying the chemical origin of surface recombination center is rather important than just revealing the existence of surface recombination in the emission process, because it will open to an effective way to control the surface recombination，utilize the surface states for sensor application and efficiently enhance the properties of optoelectronic devices based on ZnO nanostructures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Origin of the surface recombination centers in ZnO nanorods arrays by X-ray photoelectron spectroscopy

Yang

Zhao

Willander

et al. 2010

Applied Surface Science

113

View full text Add to dashboard Cite

The surface composition of as-grown and annealed ZnO nanorods arrays (ZNAs) grown by a two-steps chemical bath deposition method has been investigated by Xray photoelectron spectroscopy (XPS). XPS confirms the presence of OH bonds and specific chemisorbed oxygen on the surface of ZNAs, as well as H bonds on 0) 1 (10 surfaces which has been first time observed in the XPS spectra. The experimental results indicated that the OH and H bonds play the dominant role in facilitating surface recombination but specific chemisorbed oxygen also likely affect the surface recombination. Annealing can largely remove the OH and H bonds and transform the composition of the other chemisorbed oxygen at the surface to more closely resemble that of high temperature grown ZNAs, all of which suppresses surface recombination according to time-resolved photoluminescence measurements.

show abstract

Preparation and Characterization of ZnS Thin Films Using Chemical Bath Deposition Method: Effects of Deposition Time and Thermal Treatment

Hsieh¹,

Kong-Wei²,

Lue³

2011

Supplemental Proceedings

View full text Add to dashboard Cite

This research focuses on zinc sulphide (ZnS) thin film preparation using the chemical bath deposition (CBD) method. The obtained product is to be used as the Cd-free buffer layer for CIGS solar cells. Zinc sulfate, thiourea, hydrazine, and ammonium hydroxide concentrations were carefully selected to synthesize the ZnS thin films. The deposition time and annealing effects on the optical and electrical properties were studied. Scanning electron micrographs showed that the film surface consisted of small uniform grains (about 40 nm in size) and were free of pin-hole defects. Field emission scanning electron micrographs reveals that the film thickness ranged from 50 to 120 nm. Hall Effect measurements indicated that the synthesized ZnS was an n-type semiconductor with a resistivity of 2 × 10 3 -9 × 10 3 Ω cm. The as-deposited ZnS thin films exhibited high light transmittance, between 89.5% and 90.8%. The transmittance values decreased to 69.9%-71.2% after thermal annealing at 400C for 420 min. The chemical composition of the resulting ZnS thin films are discussed in terms of the CBD process deposition time and thermal treatment.

show abstract

X-ray photoelectron spectroscopy and auger electron spectroscopy studies of Al-doped ZnO films

Cited by 1,262 publications

References 16 publications

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

Origin of the surface recombination centers in ZnO nanorods arrays by X-ray photoelectron spectroscopy

Preparation and Characterization of ZnS Thin Films Using Chemical Bath Deposition Method: Effects of Deposition Time and Thermal Treatment

Contact Info

Product

Resources

About