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    Simulation of InGaN-based near-ultraviolet/visible dual-band photodetector

    , Article Optical and Quantum Electronics ; Volume 48, Issue 1 , 2016 , Pages 1-11 ; 03068919 (ISSN) Rasouli, F ; Hemmat, Z ; Sharif University of Technology
    Springer New York LLC  2016
    Abstract
    In this paper, we report on 2D numerical simulation of spectral response for InGaN dual-band photodetector operating at near ultraviolet and visible wavelengths. The back-to-back p–i–n/n–i–p integrated structure enables independent and simultaneous detection of two bands under back-side illumination. The effect of indium content and absorption layer thickness of the two sub-detectors on external quantum efficiency and optical crosstalk between two sub-detectors have been investigated. The optimum values for indium content and thickness of absorption layer in sub-detectors are determined  

    All inorganic cesium lead iodide perovskite nanowires with stabilized cubic phase at room temperature and nanowire array-based photodetectors

    , Article Nano Letters ; Volume 17, Issue 8 , 2017 , Pages 4951-4957 ; 15306984 (ISSN) Waleed, A ; Tavakoli, M. M ; Gu, L ; Hussain, S ; Zhang, D ; Poddar, S ; Wang, Z ; Zhang, R ; Fan, Z ; Sharif University of Technology
    Abstract
    Alluring optical and electronic properties have made organometallic halide perovskites attractive candidates for optoelectronics. Among all perovskite materials, inorganic CsPbX3 (X is halide) in black cubic phase has triggered enormous attention recently owing to its comparable photovoltaic performance and high stability as compared to organic and hybrid perovskites. However, cubic phase stabilization at room temperature for CsPbI3 still survives as a challenge. Herein we report all inorganic three-dimensional vertical CsPbI3 perovskite nanowires (NWs) synthesized inside anodic alumina membrane (AAM) by chemical vapor deposition (CVD) method. It was discovered that the as-grown NWs have... 

    Synthesis of narrow band gap (V2O5)x-(TiO2)1-x nano-structured layers via micro arc oxidation

    , Article Applied Surface Science ; Volume 256, Issue 9 , 2010 , Pages 2903-2909 ; 01694332 (ISSN) Bayati, M. R ; Moshfegh, A. Z ; Golestani Fard, F ; Sharif University of Technology
    Abstract
    V2O5-TiO2 layers with a sheet-like morphology were synthesized by micro arc oxidation process for the first time. Surface morphology and topography of the layers were investigated by scanning electron microscope (SEM) and atomic force microscope (AFM). Phase structure and chemical composition of the layers were also studied by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. It was revealed that the composite layers had a sheet-like structure average thickness of which was about 100 nm depending on the applied voltage. The layers consisted of anatase, rutile, and vanadium pentoxide phases fractions of which varied with the applied voltage. The optical properties...