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CdO/PSi/Si photo detector

Azarian, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. In spite of various works which were carried out on CdO and porous Si (PSi) separately, the interesting properties of CdO/PSi/Si system are not known well. In this work, we study the photoconductivity of deposited CdO layer on PSi/Si system. PS and CdO layers were prepared by electrochemical anodisation of p-type crystalline silicon and pulsed laser deposition (PLD) of cadmium oxide target. Then samples were annealed in air at 500°C to increase their optical transmissions to a value as large as 90% for wavelengths above 700 nm. The XRD study reveals that the annealed films are polycrystalline with grain size of about 25 nm. SEM micrograph of the CdO/PSi/Si system indicates that CdO layer has sub micron granular structure on nano-porous silicon structure. The spectral responsivity of the photodiodes was measured in Vis.-near IR region. The light sensitivity showed linear behaviour vs. reversebias voltage from 0.1 V to 3 V. The dark and photocurrent characteristics of CdO/PSi/Si structure showed ms response time. Experimental data shows that samples have good response to near infrared wavelengths
  5. Keywords:
  6. CDO Layer ; Photo detector ; Porous silicon ; Annealed films ; Anodisation ; Cadmium oxide ; Crystalline silicons ; Experimental data ; Grain size ; Granular structuress ; Nano-porous silicon ; Near-infrared wavelength ; Near-IR ; Optical transmissions ; P-type ; Photocurrent characteristics ; PLD ; Polycrystalline ; Porous si ; Response time ; Reverse-bias ; SEM micrographs ; Spectral responsivity ; Sub micron ; XRD studies ; Cadmium ; Cadmium compounds ; Detectors ; Electric potential ; Electrochemical etching ; Light transmission ; Programmable logic controllers ; Pulsed laser deposition ; Porous silicon
  7. Source: International Journal of Nanotechnology ; Volume 6, Issue 10-11 , 2009 , Pages 997-1005 ; 14757435 (ISSN)
  8. URL: https://www.inderscience.com/info/inarticle.php?artid=27562