%10 GALYUM KATKILI ZnO FİLMİNİN YAPISAL, YÜZEY MORFOLOJİSİ, OPTİK ve ELEKTRİK ÖZELLİKLERİ

Year 2019, Issue: 043, 108 - 124, 31.12.2019

H. Senem Aydoğu Seda Uzkalan

Abstract

Saf ve %10 galyum (Ga) katkılı çinko oksit (ZnO) filmlerinin ultrasonik sprey piroliz tekniğiyle cam tabanlar üzerine sentezlendi. Saf ve katkılı filmlerin yapısal, yüzey morfolojisi, optik ve elektriksel özellikleri X–ışını kırınım (XRD) örneği, atomik kuvvet mikroskopisi (AFM), ultraviyole ve görünür ışık (UV–Vis) spektrofotometresi ve dört prob tekniği ile analizlendi; sırasıyla. XRD sonuçlarından %10 Ga katkılanmasıyla tercihli yönelimin (100) dan (002) ye değiştiği gözlendi. Ayrıca, hem Scherrer Metodu hem de Williamson–Hall (W–H) Metodu ile hesaplanan filmlerin tanecik boyutu ve gerilim değerleri karşılaştırıldı. Bu karşılaştırmanın sonucunda, Scherrer Metoduyla hesaplanan değerler W–H Metodu ile hesaplanan değerlerden daha küçük bulundu. Tüm deneysel sonuçları, galyum katkısıyla Urbach enerjisi azalırken, tanecik boyutunun, yüzey pürüzlülüğünün, enerji band aralığının ve elektrik iletkenliğinin arttığını göstermiştir. Sonuç olarak, ZnO filminin kristalliği %10 Ga katkısıyla geliştiği gözlenmiştir.

Keywords

Ultrasonik sprey piroliz, Williamson – Hall Metodu, optik özellikler, Urbach enerjisi

THE STRUCTURAL, SURFACE MORPHOLOGY, OPTICAL AND ELECTRICAL PROPERTIES OF ZnO FILM DOPED GALLIUM AT 10%

Abstract

The pure and 10% gallium (Ga) doped zinc oxide (ZnO) films synthesized on glass substrates by ultrasonic spray pyrolysis technique. The structural, surface morphology, optical and electrical properties of pure and doped films were analysed by X–ray diffraction (XRD) pattern, atomic force microscopy (AFM), Ultraviolet – Visible (UV–Vis) spectrophotometer and four probe technique, respectively. It observed from the results of XRD that the preferred orientation changed from (100) to (002) with Ga doping at 10 %. Also, the grain size and strain values of films calculated both Scherrer Method and Williamson–Hall (W–H) Method were compared. In the result of this comparison, the values calculated by Scherrer Method were found to be smaller than the values calculated by W–H Method. All experimental results show that the grain size, surface roughness, energy band gap and electrical conductivity increased as its Urbach energy decreased with the addition of gallium. As a result, the crystallinity of ZnO film was observed to improve with doping Ga at 10 %.

Keywords

Ultrasonic spray pyrolysis, Williamson–Hall Method, Optic properties, Urbach energy

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