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Article
Optical Response Chracterization of In2O3/c-Si Made by Spray Pyrolysis

Authors: O.A.A. Sultan --- R.A. Ismail
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 1 Pages: 11-14
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In2O3 thin films have been deposited on silicon substrate by chemical spray pyrolysis. These films show high transparency in the visible and near-IR regions. Photoresponse of In2O3/c-Si isotype hetero-photodiode without post-deposition heat treatment has been investigated in the visible and infrared regions. Peak response situated at 600nm was observed. External quantum efficiency was 32% at peak response. C-V measurements revealed that the junction was abrupt type and built-in potential around 1eV has been obtained.


Article
Band Diagram of p-PbTe/n-Si Heterostructure

Authors: R.A. Ismail --- W.K. Hamoudi --- Y.Z. Dawood
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 2 Pages: 27-30
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In the present work, the energy band diagram of p-PbTe/n-Si heterojunctions made by thermal evaporation of a polycrystalline PbTe layer deposited on a monocrystalline Silicon substrate is constructed. Based on I-V and C-V measurements, the band offsets ΔEC and ΔEV are found experimentally to be 270mV and 610mV respectively at 300K.


Article
New High Angular Resolution Detection System for Direction Recognition

Authors: H.H. Habib --- W.K. Hamoudi --- R.A. Ismail
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 3 Pages: 27-32
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

A digital angular resolution detection device using linear detector arrays has been designed and fabricated in two models; with accuracy better than (r1q) and (r2q) respectively. The principle of operation is based on encoding the radiation angle of arrival by using a code mask based on random fractal generation.


Article
Junction Characteristics of Wide-Emitter (p)CdS-(n)Si-(p)Si Heterojunction Transistor

Authors: R.A. Ismail --- J.T. Jabbar --- O.A.S. Abdulrazaq
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2006 Volume: 2 Issue: 1-2 Pages: 3-5
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Fabrication and characterization of feasible heterojunction bipolartransistor (HBT) made by depositing of p-type CdS film on monocrystallinesilicon homojunction were demonstrated. The ideality factors (n) of emitterbaseand base-collector abrupt junctions were 1.6 and 1.8 respectively. Thetransistor exhibited current gain dc as high as 360.


Article
Characterization of CdS:In/Si Heterojunction Solar Cells

Authors: S.K. Al-Ani --- R.A. Ismail --- H.F. Al-Ta’ay
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 2 Pages: 13-17
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, CdS:In/Si anisotype heterojunction solar cells prepared by thermal evaporation technique of CdS thin films on monocrystalline silicon substrate have been fabricated, characterized and analyzed. Cells aparameters dependencies on the indium diffusion temperature were reported. The amximum obtained conversion efficiency was 8% at 93mW/cm2 (AM1) for cells made with indium diffusion temperature of 300°C. these cells are made without using antireflecting coatings and grid contacts.


Article
Wideband (0.6-11) micron Angle Deposited Thin Te:S Laser Detector

Authors: W.K. Hamoudi --- R.A. Ismail --- R.S. Abid --- M.R. Ismail
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 4 Pages: 3-14
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

A study of nanostructural, optical and electrical characteristics of obliquely deposited thin sulfur-doped films is presented. The aim was to develop a wideband (0.6-11) micron laser detector operating at room temperature with no need to biasing or amplification. The deposition angle had a decisive role on the detector specifications, namely its detectivity and response time. At deposition angle of 70 deg, the maximum detectivity was achieved 3x10^9 W-1.Hz1/2.cm while at 60 deg a fastest response 1 microsecond was obtained.


Article
Improvement of Wound Healing in Rabbit Skin by Low Level Polarized Laser Light

Authors: N. Majid --- E.I. Jameel --- A.M. Ali --- R.A. Ismail --- et al.
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2013 Volume: 9 Issue: 4 Pages: 29-32
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Living cells require energy to perform biological processes and functions. Low level lasers stimulate the basic energy processes in the mitochondria and help the production of Adenosine Tri-Phosphate (ATP)–the primary biological cell energy source needed for such activities. Full-thickness, parallel wounds in four domesticated Albino rabbits were surgically induced. The control wounds were left without laser treatment, whereas other wounds received daily laser treatments using laser energy fluence of 5 J/cm2 for rabbit 1; 4.5 J/cm2 for rabbits 2 and 3; and 3.5 J/cm2 for rabbit 4. Various polarization directions of the 660 nm low level (5 mW) diode laser were used to heal the induced wounds. The laser beam’s plane of polarization with respect to the wound line played an important role in the healing results. The fastest healing was completed in 16 day-time using a parallel orientation of polarized laser beam, while the perpendicular orientation of the polarized laser beam healed at lower rate, and the 45o polarization orientation of the laser beam gave poorest healing results. Laser photons of the parallel orientation of polarization interact with a chromophore located within the tissue. Laser illumination of wound can raise the energy of the cells and generate new collagen and fibroblast tissues, because electron excitation and de-excitation are vital in the mitochondrial respiratory chain. Wounds illuminated with a polarized laser in a plane parallel (Lll) to the wound line built new cells which filled the wound at a very fast rate and in a more homogeneous manner. The transverse orientation (L┴) of the laser beam helped filling the cells but stacking them in the orthogonal direction which required longer healing time.


Article
STUDY OF SOME OPTICAL PROPERTIES OF CdS THIN FILMS
دراسة بعض الخواص البصرية لأغشية كبريتيد الكادميوم الرقيقة

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Abstract

In this research some optical properties of CdS thin films have been studied. CdS thin films were prepared by the method of chemical spray pyrolysis deposition on glass substrates which were heated to (350Cº).The thikness of prepared film was (1400Aº).The absorption and transition spectra were recorded using (uv_visible) spectrophotometer in the range of wave lengths (330_900)nm. It is found that the absorption coefficient was more than(104)cm-1,which indicate that we have adirect allowed transition.Some other optical properties such as energy gap ,transmitlance ,Reflectivity, and extinction coefficient have been studied as afunction of photon energy.

تم في هذا البحث دراسة بعض الخواص البصرية لأغشية كبريتيد الكادميوم المحضرة بطريقة الرش الكيميائي الحراري على قواعد من الزجاج، بدرجة حرارة (350C°) وعند سمك 1400A°. لقد تم دراسة الخواص البصرية باستخدام مطياف من نوع (UV-Visible) ضمن مدى الاطوال الموجية.(330-900)nm أظهرت نتائج الفحوصات البصرية ان قيم معامل الامتصاص للغشاء كانت اكبر من (104)cm-1 مما يدل على وجود انتقالات الكترونية مباشرة. تم حساب بعض الخواص البصرية الأخرى مثل فجوة الطاقة البصرية والنفاذية و الانعكاسية و معامل الخمود كدوال لطاقة الفوتون .

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