Electrical and optical properties of selenium and vanadium pentoxide thin films

العناوين الأخرى

الخواص الكهربائية و البصرية لأفلام السيلينيوم و أفلام أكسيد الفناديوم الرقيقة

مقدم أطروحة جامعية

al-Kasasibah, Usamah Muhammad Salman

مشرف أطروحة جامعية

Tashtush, Nihad Muhammad

الجامعة

جامعة مؤتة

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

الأردن

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2010

الملخص الإنجليزي

V2O5 and Se thin films on glass substrate were prepared under vacuum by using thermal evaporation technique using molybdenum boats.

The films were deposited with different thicknesses.

Deposition rate was controlled by using quartz monitor connected with the system and the rate was 5nm per thickness.

The optical constants (Thickness, Refractive indices, Absorption coefficients, Extinction coefficients and energy gaps) were determined from measuring the reflectivity and Transmissivity for the films using spectrometer in the spectral range 300 to 900 nm, the energy gaps were determined for all films and found that for Se films the energy gap was about 1.8 eV and for V2O5 about 2 eV.

The electrical properties for the films were determined by the direct measuring of the sheet resistance of the prepared samples using a digital Diethyl electrometer and found that the electrical conductivity was increasing with decreasing film thickness for all films.

And then we have studied the effect of temperature on conductivity and it shows that for all film the electrical conductivity was increasing with increasing temperature.

Finally, the activation energy for films was determined where it was about 0.78 eV for Se films and about 0.4 eV for V2O5 films.

All films have amorphous structure as obtained from XRD technique.

Finally films with height absorption have height electrical conductivity.

التخصصات الرئيسية

الفيزياء

الموضوعات

• الخواص الكهربائية
• الخواص الضوئية
• السيلينيوم

عدد الصفحات

53

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-304871