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Photon detectors responding in UV to-IR including free carrier based homo- and hetero junction interfacial workfunction internal photoemission (HIWIP/HEIWIP) detectors, split-off band detectors, quantum dot infrared photodetectors (QDIPs), and colloidal quantum dot (CQD) detectors are discussed. HIWIP and HEIWIP detectors were focused to develop far-infrared (or terahertz) and dual-band detectors,...
In recent years, organic semiconductors have been studied extensively because of their potential applications in light emitting diodes, field effect transistors, memory devices and solar cells. Attractive characteristics of organic semiconductors include low temperature processing, mechanical flexibility, low cost and light weight. Already products based on active thin-film organic devices are in...
SiC nanocrystals growth through the surface reaction between spin-on C60 dissolved in Carbon Disulphide (CS2) and Si substrate and 800degC (100 rains.) annealed has been investigated. Scanning Electron and Atomic Force Microscopy showed the crests of C60 clusters formed preferentially on the Si substrate steps with 40-60 nm cluster sizes. Silicon carbide nanocrystallite formation after anneal. has...
The proton conductivity of chemically cross-linked composite membranes consisting of poly(vinyl alcohol) (PVA) and silicotungstic acid (STA) prepared by solution casting as proton-conducting polymer electrolytes was investigated as a function of blending composition, cross-linking density, and temperature. The conductivity mechanism was investigated by using Impedance spectroscopy in the region between...
In the present paper, a detailed investigation on the switching behavior of a nonlinear Mach-Zhender Interferometer (NMZI) has been carried out using Beam Propagation Method (BPM). A NMZI is the Mach-Zehnder Interferometer (MZI) in which one arm is made-up of a nonlinear material. Considering one optical input (one beam), a thorough investigation on input verses output characteristic has been carried...
We report fabrication and characterization of an organic photodetector (OPD) in the form of ITO coated glass/Polycarbazole (PCz)/Al Schottky contact for application in visible region and Al/PANA/ITO, Ti/PANA/ITO Schottky contacts of application in U.V. region. The current voltage (I-V) characteristics of the devices were measured by using microprobe arrangement. The performance parameters of ITO/Polycarbazole...
In this paper we report the mechanism of charge transport in conducting polymers. The basic concept of defect states in conjugated polymers (solitons, polarons and bipolarons in conjugated polymers) are briefly discussed. This paper addresses sources of disorder in conducting polymers depend on inhomogeneous doping and also the synthesis routes. We synthesized the conjugated polymers by different...
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