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- 저자 : S. Ismat Shah (검색결과 3 건)
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Thickness dependent magnetic and ferroelectric properties of LaNiO3 buffered BiFeO3 thin films
Shahzad Hussain,S.K. Hasanain,G. Hassnain Jaffari,S. Ismat Shah 한국물리학회 2015 Current Applied Physics Vol.15 No.3
BiFeO3 (BFO) thin films with thickness increasing from 40 to 480 nm were successfully grown on LaNiO3 (LNO) buffered Pt/Ti/SiO2/Si(100) substrate and the effects of thickness evolution on magnetic and ferroelectric properties are investigated. The LNO buffer layer promotes the growth and crystallization of BFO thin films. Highly (100) orientation is induced for all BFO films regardless of the film thickness together with the dense microstructure. All BFO films exhibited weak ferromagnetic response at room temperature and saturation magnetization is found to decrease with increase in film thickness. Well saturated ferroelectric hysteresis loops were obtained for thicker films; however, the leakage current dominated the ferroelectric properties in thinner films. The leakage current density decreased by three orders of magnitude for 335 nm film compared to 40 nm film, giving rise to enhanced ferroelectric properties for thicker films. The mechanisms for the evolution of ferromagnetic and ferroelectric characteristics are discussed.
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M. Ikram,S. Ali,R. Murray,A. Hussain,Islah-u-din,S. Ismat Shah 한국물리학회 2015 Current Applied Physics Vol.15 No.1
In an effort to develop hybrid organic solar cells with improved power conversion efficiency (PCE), devices based on poly (3-hexylthiophene) (P3HT):phenyl C61-butyric acid methyl ester (PCBM) active layer and poly (3,4-ethylenedioxythiophene) (PEDOT):poly (styrenesulfonate) (PSS) buffer layers were prepared. A systematic replacement of PCBM was achieved by introducing nanostructured TiO2 (~15 nm particle size), dissolved separately in chlorobenzene (CB) and 1,2 edichlorobenzene (DCB), to the (P3HT:PCBM) active layer while keeping a fixed amount for P3HT. To understand the effect of fullerene replacement with the inorganic metal oxide nanoparticles on different properties of resulting devices, a variety of techniques such as CurrenteVoltage (JeV) characteristics, Field Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM), Ultravoilet-Visible (UVeVis) Spectrophotometry and External Quantum Efficiency (EQE) were employed. The addition of TiO2 nanoparticles in the active layer improved the power conversion efficiency (PCE) of P3HT:PCBM devices. The addition of TiO2 nanoparticles using CB as solvent enhanced the absorption in visible region and also introduced a red shift in the absorption spectra. A significant increase in EQE was observed for devices with TiO2 nanoparticles in the active layer. Mixing TiO2 also increased the surface roughness of the active layer where TiO2 nanoparticles were found to agglomerate as their concentration increased relative to fullerene derivative. A complete agglomeration of TiO2 was observed in the absence of PCBM.
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G. Hassnain Jaffari,Abdul K. Rumaiz,C. Ni,Emre Yassitepe,M. Bah,S. Ismat Shah 한국물리학회 2015 Current Applied Physics Vol.15 No.6
Pulsed laser deposition technique has been used to manipulate the structural order of Fe67Co33 films grown at various substrate temperatures. Films deposited at room temperature exhibited two phases including the stable crystalline phase embedded in the amorphous phase. The crystalline phase separated into two distinct bcc phases as evident from the splitting of (110) reflections, as compared to the bulk counterpart which crystalize into the single phase bcc structure. Both crystalline phases and the amorphous phase were metastable. Films prepared at higher substrate temperatures (~500 ℃), crystallized into the single stable equilibrium bcc structure. Orientation dependent magnetic properties are also presented for the films prepared at both room temperature and higher substrate temperatures. As expected, the easy axes lie parallel to the plane of the substrate due to shape anisotropy. Out of plane magnetization for the films which exhibited short range ordering is found to saturate at smaller field compared to films where single phase bcc structure is stabilized.
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