In this paper, we report the effect of 1.5 MeV proton beam irradiation dose on the structural and electrical properties of TiO 2 thin films deposited on n-Si substrates. The formation and transformation of different TiO 2 phases in the irradiated thin films were characterized by X-ray diffraction and X-ray photoelectron spectroscopy (XPS). X-ray diffraction measurements revealed that the as grown film was rich in Ti 5 O 9 phase and then converted to mixed phases of TiO 2 (rutile and anatase) after exposure with radiation doses up to 5 Â 10 14 cm À2 . The XPS results revealed the formation of oxygen vacancy (negative) traps in the exposed TiO 2 films, which showed strong dependence on the dose. The C-V measurements showed that proton radiations also damaged the Si substrate and created deep level defects in the substrate, which caused a shift of 0.26 6 0.01 V in the flat band voltage (V FB ). I-V measurements showed that the ideality factor increased and the rectification ratio dropped with the increase in the radiation dose. The present study showed the stability of TiO 2 /Si interface and TiO 2 film as an oxide layer against proton radiations. V C 2014 AIP Publishing LLC. [http://dx.

No abstract

No abstract

No abstract

Tin monoxide is a significant functional semiconductor material which employed to a wide area of applications especially optical and energy storage devices. Presently, template free hydrothermal technique has been employing to synthesize stannous oxide (SnO) clinopinacoid type controlled morphology using SnCl2 x 2H2O, NH3, and H2O as raw materials. The crystalline phase, morphology, particle size and component were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FESEM). FESEM results exhibited the large scale homogeneous growth of clinopinacoid architecture with the obvious size of 5 - 7 micrometers. The XRD results showed that the average crystallite size of the tetragonal phase romarchite SnO was about 29 nm calculated from the FWHM of X-ray diffraction pattern. The dominant Raman active modes A(1g) = 205 cm(-1), B(1g) = 105-107 cm(-1) and about 6 cm(-1) redshift were observed by the Raman spectroscopy, which further confirmed the existence of the nano tetragonal phase SnO. The electrochemical performance of as-synthesized SnO clinopinacoid structure as the anode material for lithium ion batteries was investigated. It was observed that the first discharge capacity of the two samples could reach a very high value of 1502 mA h g(-1) and 1422 mA h g(-1) respectively. The effect of nitrogen concentration on morphology as well as cyclic performance of Li-Ion-batteries was also discussed.

No abstract

No abstract