najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2021-12-3-317-328najo-490Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХInvestigation of the effect of zinc precursors onto structural, optical and electrical properties of CBD deposited ZnS thin filmsИсследование влияния прекурсоров на структурные, оптические и электрические свойства тонких пленок ZnS, осажденных методом CBDKhatriRajeshkumar PKhatriRajeshkumar P

Ahmedabad 382424, Gujarat

rajukhatri_222@yahoo.co.inPatelAmitkumar JPatelAmitkumar J

Godhra, Panchmahal 389001, Gujarat

Department of Physics, Gujarat Technological UniversityIndiaDepartment of Applied Science, Faculty of Physics, Government Engineering CollegeIndia202104082025123317328Copyright © Khatri R.P., Patel A.J., 20252025Khatri R.P., Patel A.J.Khatri R.P., Patel A.J.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/490

Zinc sulfide (ZnS) thin films were deposited onto microscopic silica slides through the cost-effective chemical bath deposition (CBD) method. The optimized bath parameters were: 25 ml of 0.1 M zinc precursors (ZnCl2, Zn(CH3COO)2, ZnSO4), 25 ml of 1 M thiourea and 3 ml of 3.75 M triethanolamine (TEA). The effects of different zinc precursors (ZnCl2, Zn(CH3COO)2, ZnSO4) on the growth mechanism of ZnS thin film were investigated using thermal, structural, morphological, optical and electrical studies. The XRD pattern has shown Miller indexing peaks corresponding to the hexagonal phase of as-grown ZnS thin film with the estimated grain size of 22 – 27 nm. The change in physical properties (weight loss) of ZnS powder as a function of temperature was recorded using thermogravimetry (TGA/DTA). Scanning electron microscopy (SEM) revealed the effect of ZnCl2, Zn(CH3COO)2 and ZnSO4 precursors on growth mechanism. UV/visible optical transmission/absorption spectra displayed the transmittance between 10 to 29 % of as-grown ZnS thin film with a band gap in the range of 4.10 – 4.25 eV. Photoluminescence (PL) analyses demonstrated broad blue emission around ~ 459 nm was attributed to recombination of electron-hole pair from donor-acceptor trap levels to valance band. Raman spectra of ZnS powder prepared using different zinc precursors were also reported. The values of electrical parameters (resistivity, conductivity, activation energy, Hall coefficient, carrier concentration, mobility) were investigated using the two-point probe method and Hall-effect apparatus.

Тонкие пленки сульфида цинка (ZnS) были нанесены на предметные стекла с кремнеземом с помощью экономичного метода - метода химического растворного осаждения (химического осаждения в ванне) CBD. Оптимизированные параметры ванны: 25 мл 0.1 М прекурсоров цинка (ZnCl2, Zn(CH3COO)2, ZnSO4), 25 мл 1 М тиомочевины и 3 мл 3.75 М триэтаноламина (ТЭА). Влияние различных прекурсоров цинка (ZnCl2, Zn(CH3COO)2, ZnSO4) на механизм роста тонкой пленки ZnS было исследовано с помощью термических, структурных, морфологических, оптических и электрических исследований. Рентгенограмма показала пики индексации Миллера, соответствующие гексагональной фазе свежевыращенной тонкой пленки ZnS с расчетным размером зерна 22-27 нм. Изменение физических свойств (потеря массы) порошка ZnS в зависимости от температуры регистрировалось с помощью термогравиметрии (ТГА/ДТА). Сканирующая электронная микроскопия (СЭМ) выявила влияние предшественников ZnCl2, Zn(CH3COO)2 и ZnSO4 на механизм роста. Спектры УФ/видимого оптического пропускания/поглощения показали коэффициент пропускания от 10 до 29 % от выращенной тонкой пленки ZnS с шириной запрещенной зоны в диапазоне 4.10 – 4.25 эВ. Анализ фотолюминесценции (ФЛ) показал широкое синее излучение около ~ 459 нм, которое было связано с рекомбинацией электронно-дырочной пары с уровней донорно-акцепторной ловушки в валентную зону. Также получены спектры комбинационного рассеяния порошка ZnS, приготовленного с использованием различных предшественников. Значения электрических параметров (удельное сопротивление, проводимость, энергия активации, коэффициент Холла, концентрация носителей заряда, подвижность) исследовались методом двухточечного зонда и прибором на эффекте Холла.

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The authors declare that there are no conflicts of interest present.