اثر پرتو گاما بر روی خواص لایه نازک CdS تهیه شده در سه ضخامت مختلف با روش CBD

نوع مقاله : مقاله پژوهشی

نویسندگان

مجتمع پژوهشی شمال غرب کشور (بناب)، پژوهشکده کاربرد پرتوها، پژوهشگاه علوم و فنون هسته‌ای، تهران، ایران

10.22052/rsm.2026.256523.1111

چکیده

در این پژوهش، لایه‌های نازک نانوساختاری CdS با سه ضخامت مختلف (حدود 88، 140 و 211 نانومتر) به روش حمام شیمیایی تهیه و اثر تابش گاما بر خواص ساختاری و اپتیکی آن‌ها بررسی شد. تصاویر SEM نشان دادند که لایه‌ها سطحی یکنواخت با نانوذرات کروی و توزیع همگن دارند و تابش گاما موجب تغییر شکل ذرات نمی‌شود. الگوهای XRD پیک اصلی را در زاویه حدود 7/26 درجه نشان دادند که مربوط به ساختارهای مکعبی و شش‌ضلعی CdS است و با افزایش دُز تابش شدت پیک‌ها، بدون تغییر در فاز بلوری، افزایش یافت. نتایج اپتیکی نشان داد که با افزایش ضخامت و تابش گاما، شدت جذب افزایش می‌یابد و گاف انرژی کاهش می‌یابد. قبل و بعد از تابش گاف انرژی برای نمونه CdS با ضخامت 09/88 نانومتر در محدوده 06/2- 49/2، برای نمونه CdS با ضخامت 9/140 نانومتر در محدوده 26/2- 45/2 و برای نمونه CdS با ضخامت 211 نانومتر در محدوده 22/2- 41/2 تخمین زده شد. کاهش در گاف انرژی نمونه‌ها می‌تواند مربوط به افزایش اندازه دانه‌ها و در نتیجه افزایش نقص‌ها و ترازهای جایگزیده در ماده باشد. هم‌چنین تغییرات گاف انرژی با دُز تابشی مورد بررسی قرار گرفت.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of gamma radiation on the properties of CdS thin films prepared in three different thicknesses by the CBD method

نویسندگان [English]

  • Tavakkol Tohidi
  • Reza Bagheri
  • Mahdi Taghavi
Northwest Research Complex (Bonab), Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran
چکیده [English]

In this study, nanostructured CdS thin films with three different thicknesses (approximately 88, 140, and 211 nm) were prepared using the chemical bath method. The effect of gamma irradiation on their structural and optical properties was investigated. SEM images indicated that the films had a uniform surface with spherical nanoparticles and a homogeneous distribution. Gamma irradiation did not cause particle shape. XRD patterns revealed the main peak at an angle of approximately 26.7 degrees, corresponding to the cubic and hexagonal structures of CdS. With an increasing irradiation dose, the intensity of the peaks increased without altering the crystalline phase. Optical results demonstrated that absorption intensity increased and energy gap decreased with increasing thickness and gamma irradiation. Before and after irradiation, the energy gap was estimated to be in the range of 2.49-2.06 for the CdS sample with a thickness of 88.09 nm, 2.45-2.26 for the CdS sample with a thickness of 140.9 nm, and 2.41-2.22 for the CdS sample with a thickness of 211 nm. The decrease in the energy gap of the samples can be attributed to the increase in grain size and the rise in defects and dislocation levels in the material. The study also investigated the changes in the energy gap with the radiation dose.

کلیدواژه‌ها [English]

  • Thin film
  • nanostructure
  • cadmium sulfide
  • optical properties
  • gamma radiation

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