Papers by Author: Muhamad Rasat Muhamad

Abstract: The effects of Indium doped on Porous Silicon Nanostructure (PSN) have been studied. The Electroluminescence studies on Indium-doped porous silicon nanostructure (In:PSN) are presented. The main objective of this paper is study the EL effects of Indium doping on PSN. Porous silicon nanostructure layers have been formed by anodically etching unpolished p-type Si [100] wafer with surface resistivity of 1-10 ohm cm-1 in Hydroflouric (HF) solution at 1:1 ratio of Ethanol. Indium (In) was doped on PSN using cathodic electrodeposition composed of InCl3 and ethanol electrolythe. A diode structure has been fabricated comprising semi-transparent Au/In:PSN/p-Si substrate/Al ohmic contact electrode to observe the EL spectra. The In:PSN device shows increasing on EL and PL Intensity as well as blue-shift EL and PL spectrum is observed. Possible reasons for the enhancement will be discussed. Technological application of PSN as a light emitter would have significant impact on numerous technologies such as display panels or integrated circuits with optoelectronic devices (IO) on board and sensors.

Abstract: The molecular organization of the phospholipids Langmuir-Blodgett (LB) films on solid substrates has been studied via Fourier Transform Infra Red (FTIR) spectroscopy. In this study, the formation of well organized ultra thin LB films of phospholipid molecules has been performed by depositing the monolayer onto the solid substrates of silicon wafer. The space filling molecular models of two types of phospholipids have been proposed on the basis of the FTIR spectra.