Maiti, Payel and Das, Pradip Sekhar and Bhattacharya, Manjima and Mukherjee, Smita and Saha, Biswajit and Mullick, Awadesh Kumar and Mukhopadhyay, Anoop Kumar (2017) Transparent Al+3 doped MgO thin films for functional applications. Materials Research Express , 4 (8). Article No-086405. ISSN 2053-1591

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The present work reports the utilization of a relatively simple, cost effective sol-gel technique based route to synthesize highly transparent, spin coated 4.1 at% Al+3 doped MgO thin films on quartz substrates. The films were characterized by XRD, XPS, Raman spectroscopy, and SIMS techniques. The microstructures were characterized by FESEM and TEM while the nanomechanical properties were assessed by the nanoindentation technique. Finally the optical transmittance was measured by UV-vis technique. The x-ray diffraction (XRD) study suggests the crystal facet (2 0 0) of MgO lattice to be distorted after incorporation of Al+3 into MgO lattice. From FESEM the doped films were found to have a dense microstructure with a crystallite size of about 20 nm as revealed by the TEM studies. Nanoindentation measurements indicated drastic increase of elastic modulus for the Al+3 doped MgO thin films by similar to 73% compared to that of the pristine MgO thin films along with retaining the nanohardness at similar to 8 GPa. The transmittance of Al+3 doped MgO thin films in the visible range was significantly higher (similar to 99%) than that of pristine MgO (similar to 90%) thin films. The films also had a relatively higher refractive index of about 1.45 as evaluated from the optical properties. The enhanced transmittance as well as the improved elastic modulus of Al+3 doped MgO thin films suggest its promising candidature in magnetic memory devices and as buffer layers of solar cells.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Jan 2018 10:14
Last Modified: 25 Jan 2018 10:14

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