Gamma Radiation Effects on The Performance of The CdSe Thin Film for Photodetector Application


  • Zainab Hammo Dept. of Physics at Mosul University, Mosul, Iraq.
  • Laith Najam Mosul University, College of Science
  • Laith Al_Taan College of Science, Mosul University


CdSe, gamma radiation , Photodetector, Thin film, PLD


Cadmium Selenide thin films were deposited on glass substrates and p-type silicon substrates using pulsed laser deposition technique (Nd: YAG laser). Some of these samples were exposed to different intervals (10,20,30,40) days of gamma radiation using a 226Ra source emitting 186 KeV ?-ray. For comparison purposes, the other diodes were kept without any irradiation. Results have shown all these thin films exhibit a hexagonal structure. However, there is a new (102-SiO2) peak appeared in the irradiated thin film pattern. The crystallite size of pristine and irradiated CdSe thin films were (26.9,25.8,28.4,35.3 and 22.2) nm respectively, whereas the average grain size of the pristine film was (112.3-29.24) nm whereas for the irradiated films (45.58-33.72) nm, (61.16-42.8) nm, (55.7-36.03) nm and (53.31-43.45) nm. Results also show that the band gap increased from 2.17eV for pristine thin films to 2.28, 2.45, 2.2, and 2.28 eV for the irradiated thin films. also, I-V characteristics show the dark current decreases for the irradiated thin films. The forward current under illumination increases when exposed to small gamma radiation values and then decreases with higher exposure values. In contrast, the reverse current increases with the irradiation.


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Author Biography

Laith Al_Taan, College of Science, Mosul University

Physics Dept.


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Figure 1.   Diagrams (a) (I-V) characteristic measurement, (b) switching behaviour measurement, (c) spectral response measurements




How to Cite

Z. Hammo, L. Najam, and L. Al_Taan, “Gamma Radiation Effects on The Performance of The CdSe Thin Film for Photodetector Application”, International Journal of Engineering and Applied Physics, vol. 4, no. 2, pp. 977–983, Jun. 2024.