Effects of frequency and bias voltage ondielectric properties and electric modulus ofAu/Bi4Ti3O12/n-Si (MFS) capacitors

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dc.contributor.authorDurmuş, Perihan
dc.contributor.authorBilkan, Çiğdem
dc.contributor.authorYıldırım, Mert
dc.date.accessioned2020-04-30T14:39:12Z
dc.date.available2020-04-30T14:39:12Z
dc.date.issued2017
dc.departmentDÜ, Mühendislik Fakültesi, Mekatronik Mühendisliği Bölümüen_US
dc.description.abstractIn this work, a metal-ferroelectric-semiconductor (MFS) type capacitor was fabricated and admittance measurements were held in a wide frequency range of 1 kHz-5 MHz at room temperature for the investigation of frequency and voltage dependence of complex dielectric constant, complex electric modulus and electrical conductivity of the MFS capacitor. Bismuth titanate (Bi4Ti3O12) with high dielectric constant was used as interfacial ferroelectric material and the structure of MFS capacitor was obtained as Au/Bi4Ti3O12/n-Si. Experimental results showed that dielectric, modulus and conductivity parameters are strong functions of frequency and voltage especially in depletion and accumulation regions due to the existence of surface states (Nss), series resistance (Rs), interfacial polarization and interfacial layer. It was found that Rs of the structure and interfacial ferroelectric layer are efective in accumulation region whereas surface states (Nss) and interfacial polarization are efective in depletion region. Also the changes in dielectric, modulus and conductivity parameters become considerably high particularly at low frequencies due to high values of Rs and Nss. The observed anomalous peak in voltage dependent plots of capacitance and dielectric constant was atributed to the particular density distribution of Nss, Rs and minority carrier injection. Moreover, the value of conductivity at low and intermediate frequencies is almost independent of frequency thus low frequency data was used to extract d.c. conductivity. This work showed that the use of high-dielectric Bi4Ti3O12 as ferroelectric interfacial layer in a MFS capacitor is preferable due to high values of its dielectric constant compared with traditional insulator layer materials such as SiO2 and SnO2. Therefore, a MFS capacitor with Bi4TiO12 interfacial layer can store more energy thanks to its high dielectric constant.en_US
dc.identifier.endpage1008en_US
dc.identifier.issn1302-0900
dc.identifier.issn2147-9429
dc.identifier.issue4en_US
dc.identifier.startpage1002en_US
dc.identifier.urihttps://app.trdizin.gov.tr/makale/TWpVMk5USTRPQT09
dc.identifier.urihttps://hdl.handle.net/20.500.12684/1334
dc.identifier.volume20en_US
dc.indekslendigikaynakTR-Dizinen_US
dc.language.isoenen_US
dc.relation.publicationcategoryMakale - Ulusal Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.titleEffects of frequency and bias voltage ondielectric properties and electric modulus ofAu/Bi4Ti3O12/n-Si (MFS) capacitorsen_US
dc.typeArticleen_US

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