On the Frequency C-V and G-V Characteristics of Au/Poly (3-Substituted thiophene) (P3DMTFT)/n-GaAs Schottky Barrier Diodes

• Authors: A. Özdemir , D. Akcan , H. Lapa , A. Yavuz , S. Duman
• Languages of publication: EN

Abstracts

EN

The frequency-dependent electrical characteristics of Au/Poly (3-Substituted thiophene) (P3DMTFT)/ n-GaAs Schottky barrier diodes have been investigated by using capacitance-voltage (C-V) and conductance-voltage (G/ω-V) measurements at room temperature. Negative capacitance behavior has been observed in the C-V characteristic for each frequency. The magnitude of absolute value of C was found to increase with decreasing frequency in the forward bias region. The value of G/ω increases with decreasing frequency in the positive region. This can be attributed to the increase in the polarization at low frequencies and to the fact that more carriers are introduced into the structures. Negative capacitance phenomenon can be explained by the loss of interface charges from the occupied states below the Fermi level, caused by impact ionization process. According to obtained result, the values of C and G/ω are strong functions of frequency and applied bias voltage, particularly in the accumulation an inversion region. Doping concentration (N_{d}), diffusion potential (V_{d}), Fermi energy level (E_{f}), and barrier height (Φ_{b}(C-V)) values have been calculated from reverse bias C^{-2}-V plots for 3 MHz. Finally, the obtained value of R_{s} in the accumulation region increases with decreasing frequency.

Keywords

EN

73.30.+y

Discipline

• 73.30.+y: Surface double layers, Schottky barriers, and work functions(see also 82.45.Mp Thin layers, films, monolayers, membranes in electrochemistry; see also 87.16.D- Membranes, bilayers, and vesicles in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 2B
• Pages: B-450-B-454

Dates

published

2015-8

Contributors

author

A. Özdemir

• Department of Physics, Süleyman Demirel University, Isparta, Turkey

author

D. Akcan

• Department of Physics, Süleyman Demirel University, Isparta, Turkey

author

H. Lapa

• Department of Physics, Süleyman Demirel University, Isparta, Turkey

author

A. Yavuz

• Department of Chemistry, Süleyman Demirel University, Isparta, Turkey

author

S. Duman

• Department of Physics, Atatürk Üniversity, Erzurum, Turkey

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Identifiers

DOI

10.12693/APhysPolA.128.B-450