Electrical, optical and surface characterization of reactive RF magnetron sputtered molybdenum oxide films for solar cell applications

Date

2019-10-01

Author

Mehmood, Haris
Bektaş, Gence
Yıldız, İlker
Tauqeer, Tauseef
Nasser, Hisham
Turan, Raşit

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

352
views

0
downloads

Thin films of molybdenum oxide (MoOx) were fabricated by radio frequency (RF) reactive magnetron sputtering technique with various oxygen flow rates and the deposition pressure fixed at 4 mTorr. The stoichiometry, composition, chemical binding energy, electrical, and optical properties of the sputtered MoOx films were examined. The deposited films were characterised by x-ray photoelectron spectroscopy (XPS), capacitance-voltage measurement (CV), spectroscopic ellipsometer (SE), and ultraviolet-visible spectroscopy (UV-VIS). XPS studies of the film indicated the presence of Mo5+ and Mo6+ oxidation states within the film. The deposited sputtered films were semiconducting in nature with the highest work function of 5.92 eV observed for MoOx. The stoichiometry for RF sputtered MoOx (x < 3) was found to be 2.73. CV analysis indicated that density of defect states in the MoOx films decreased with the corresponding increase in the oxygen flow rate. SE studies have shown that the refractive indices of the as-deposited films ranged from -1.8-2.05 at nominal wavelength of 632.8 nm. Similarly, high transmittance and large band gap values of sputtered MoOx were observed. It was proved that deposited MoOx is of n-type character with the Fermi level variation observed within the band gap of MoOx upon changing the oxygen flow rate.

Subject Keywords

Mechanical Engineering, General Materials Science, Mechanics of Materials, Condensed Matter Physics

URI

https://hdl.handle.net/11511/34758

Journal

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING

DOI

https://doi.org/10.1016/j.mssp.2019.05.018

Collections

Center for Solar Energy Research and Applications (GÜNAM), Article

Suggestions

OpenMETU
Core

Mechanical and microstructural evaluations of hot formed titanium sheets by electrical resistance heating process Ozturk, Fahrettin; Ece, Remzi Ecmel; Polat, Naki; Koksal, Arif; Evis, Zafer; Polat, Aytekin (Elsevier BV, 2013-08-20) In this study, effect of temperature in the electrical resistance heating process on mechanical properties and microstructures of commercially pure titanium grade 2 (CP2) and Ti-6Al-4V (T64) alloy sheets was investigated. Sheets were successfully heated by the electric resistance heating process, and their mechanical properties and microstructures were evaluated. Ductilities of both materials were increased significantly after 400 degrees C. Results indicate that no significant change was observed in grain ...
Electrical characterization of low defect density nonpolar (11(2)over-bar0) a-plane GaN grown with sidewall lateral epitaxial overgrowth (SLEO) İmer, Muhsine Bilge; Rajan, Siddharth; Keller, Stacia; Mishra, Umesh K.; Nakamura, Shuji; Speck, James S.; DenBaars, Steven P. (Cambridge University Press (CUP), 2008-02-01) We studied the effect of extended defects on electrical characteristics of Si doped n-type nonpolar a-plane GaN films. The n-type GaN layers were grown on co-loaded reduced defect density sidewall lateral epitaxial overgrowth (SLEO) a-plane GaN templates and high defect density planar a-plane GaN templates by metalorganic chemical vapor deposition (MOCVD). The highest conductivity value was observed at the carrier concentration of 1.05 x 10(19) cm(-3) as 261.12 cm(2)/Vs for SLEO a-GaN and 106.77 cm(2)/Vs fo...
Electrical, optical and photoconductive properties of poly(dibenzo-18-crown-6) Qasrawi, AF; Cihaner, A; Önal, Ahmet Muhtar (Wiley, 2004-01-01) To investigate the energy levels, absorption bands, band gap, dominant transport mechanisms, recombination mechanisms and the free carrier life time behavior of poly-dibenzo-18-crown-6, poly-DB18C6, films, the dark electrical conductivity in the temperature range of 200-550 K, the absorbance and photocurrent spectra, the photocurrent -illumination intensity and time dependence at 300 K were studied. The dark electrical conductivity measurements revealed the existence of three energy levels located at 0.93, ...
Structural, electrical and anisotropic properties of Tl4Se3S chain crystals QASRAWI, ATEF FAYEZ HASAN; Hasanlı, Nızamı (Elsevier BV, 2009-10-01) The structure, the anisotropy effect on the current transport mechanism and the space charge limited current in Tl4Se3S chain crystals have been studied by means of X-ray diffraction, electrical conductivity measurements along and perpendicular to the crystal's c-axis and the current voltage characteristics. The temperature-dependent electrical conductivity analysis in the region of 150-400 K, revealed the domination of the thermionic emission of charge carriers over the chain boundaries above 210 and 270 K...
Electrical conductivity of polypyrrole films at a temperature range of 70 K to 350 K Kaynak, A (Elsevier BV, 1998-01-01) The de conductivity of electrochemically synthesized polypyrrole films doped from light to intermediate levels with p-toluene sulfonic acid was measured in the temperature range of 77 to 300 K, using a modified four-probe rig. Plots of de conductivity vs. temperature were parameterized by fitting Mott's Variable Range Hopping conduction model. The localization length of localized electrons was assumed to be 3 Angstrom, which is approximately equal to the length of a pyrrole monomer. Mott parameters of polyp...

Citation Formats

H. Mehmood, G. Bektaş, İ. Yıldız, T. Tauqeer, H. Nasser, and R. Turan, “Electrical, optical and surface characterization of reactive RF magnetron sputtered molybdenum oxide films for solar cell applications,” MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, pp. 46–56, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34758.