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Aniruddha Mondal,Jay Chandra Dhar,P Chinnamuthu,Naorem Khelchand Singh,Kalyan Kumar Chattopadhyay,Sanat Kumar Das,Santosh Ch Das,Anirban Bhattacharyya 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.2
Symmetrical TiO2 nanowire (NW) arrays have been synthesized on Si by using glancing angle deposition technique. The Raman spectrum of TiO2 thin film (TF) and TiO2 NWs sample indicates the presence of both anatase and rutile phase TiO2. The electrical properties of the vertically ordered TiO2 NW arrays have been measured. The leakage current for high-k TiO2/Si capacitance reduced with the addition of TiO2 NWs on 30 nm TF. TiO2 NW dielectric was employed to achieve large conduction band offset between oxide layer and Si. A high gate capacitance has been observed due to NW effect. The barrier height between Ag/TiO2-NW interfaces was 0.9 eV and an exclusively lowest leakage current of 8.8 × 10−7 A/cm2 (at +1 V)was reported for the TiO2 NW device.
Optical Absorption Studies of GaSbN Grown by Using Liquid Phase Epitaxy
이진구,채연식,Aniruddha Mondal,김미라,Sunanda Dhar,Tushar Dhabal Das 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
Optical absorption measurements were performed on GaSbN semiconductors with nitrogen concentrations in the layers ranging from 0.9 to 1.7%. The surface morphology was examined by using an atomic force microscope. The X-ray diffraction measurements confirmed the nitrogen concentrations in the layers. The reduction of the band gap with increasing amount of nitrogen in the layers was confirmed by their optical band edge absorption in the Fourier-transform infrared spectroscopy measurements. The absorption spectrum of the GaSbN semiconductor with a nitrogen concentration of 1.7% was fitted using the band anticrossing model (BAC) model.
2D Like Photonic Crystal Using In2O3-SiOx Heterostructure Nanocolumn Arrays and Humidity Sensing
Naorem Khelchand Singh,Bijit Choudhuri,Aniruddha Mondal,Jay Chandra Dhar,Tamal Goswami,Saptadip Saha,Chitralekha Ngangbam 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.5
2D like photonic crystal was fabricated with the help of GLAD synthesized In2O3-SiOx heterostructure nanocolumnar arrays. Different dielectric media like air and water were used to demonstrate the optical characteristics and band gap of the crystal. Nearly 33 nm red shift of the band gap was observed for wet sample as compared to dry. Broad band UV-Vis absorption has been observed for the dry In2O3-SiOx heterostructure nanocolumnar arrays, which decreases in wet condition. The device shows low current conduction at lower humidity, which enhances at higher humidity condition due to the absorption of water molecules from the environment by the porous surface. The device possesses 5.6 × 10−3 mA/cm2 current at 10%, which increases to 1.4 × 10−1 mA/cm2 at 99% humidity under applied potential of 2 V. The sample shows the color alteration from black (dry) to brown (wet) due to changes in its effective refractive index.