An experimental investigation: The impact of cobalt doping on optical properties of YbFeO3-σ thin film

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Polat Ö., Çağlar M., Coşkun F. M. , Coşkun M. , Çağlar Y., Türüt A.

Materials Research Bulletin, cilt.119, ss.110567-110576, 2019 (SCI Expanded İndekslerine Giren Dergi)

• Cilt numarası: 119
• Basım Tarihi: 2019
• Dergi Adı: Materials Research Bulletin
• Sayfa Sayısı: ss.110567-110576

Özet

It has been shown that the band gap engineering plays vital role in the designing of new semiconductors.

Therefore, many research groups have focused on various techniques to tune the band gap such as chemical

doping and strain energy. In the present work, polycrystalline YbFeO3-σ (YbFO) and YbFe1-xCoxO3-σ (YbFCO)

(x=0.01 and 0.10) thin films were grown on indium tin oxide (ITO) substrates at 500 oC by magnetron

sputtering technique. The crystalline orientation of the thin films has been studied by XRD. SEM and AFM have

been utilized in the surface topographical investigations and XPS analysis was carried out in order to reveal the

oxidation states of elements in studied materials. It has been shown that the optical band gap YbFO can be tuned

from 2.1 eV to 1.72 eV via Co doping into Fe sites. Furthermore, diffuse reflectance spectroscopy (DRS) has been

employed to study reflectance %, refractive index (n), extinction coefficient (k), real and imaginary parts of

dielectric constant and conductivity.