Güllü, Hasan Hüseyin

Scholarly Output Search Results

Now showing 1 - 3 of 3

Citation - WoS: 13
Citation - Scopus: 14
Analysis of Double Gaussian Distribution on Barrier Inhomogeneity in a Au/n-4H SiC Schottky Diode
(Springer, 2021) Gullu, H. H.; Sirin, D. Seme; Yildiz, D. E.; Seme Sirin, D.
A n-4H SiC based diode is fabricated by an Au front metal contact to provide rectification at the metal-semiconductor (MS) junction, and a back ohmic contact is also obtained using Au metal with post-thermal heating. MS diode characteristics are investigated by current-voltage (I - V) measurements with a wide range of temperature from 80 K to 300 K. At each temperature, rectifying behavior is achieved and it is improved with an increase in temperature. Barrier height and ideality factor are calculated according to the thermionic emission (TE) model from linearity in the forward bias region of the ln(I) versus V plot. The experimental zero-bias barrier height (Phi(b0)) values are in a good agreement with literature, and at around room temperature the ideality factor (n) reaches unity. At saturation regions in I - V curves, parasitic resistance values are derived by Ohm's law and the series resistance values are also reevaluated by Cheung's relation. Detailed I - V analysis is performed by modifying the TE model with an approximation of low barrier patches embedded in the main barrier height. Two linear relations in the characteristic plots of Phi(b0) and n indicate that double Gaussian distribution is a suitable current conduction model via localized barrier patches at low temperatures. Additionally, reverse bias current flow is analyzed under the dominant effect of Poole-Frenkel emission associated with the interfacial traps. According to the characteristic electric field-dependent current density plot, emission barrier height and relative dielectric constant for n-4H SiC are calculated.
Citation - WoS: 7
Citation - Scopus: 8
Effect of Tio₂ Thin Film With Different Dopants in Bringing Au-Metal Into a Contact With N-Si
(Springer, 2022) Yildiz, D. E.; Gullu, H. H.; Cavus, H. Kanbur
In this work, effects of TiO2 contribution together with two different doping as graphene oxide (GO) and rubidium fluoride (RbF) are investigated at the interface of Au/n-Si metal-semiconductor (MS) diode. Diode characteristics are mainly evaluated from current-voltage measurements and values of barrier height and ideality factor are compared to the diodes with and without doping in interface layer. Although existence of interface layer increases these values, there is a decrease with adapting GO and RbF to the TiO2 structure. In addition, series and shunt resistance values are calculated with interface layer, and resistance effect is also discussed by Norde's and Cheung's functions. Forward biased carrier transport mechanism is evaluated under the presence of interface states by thermionic emission model and density of interface trap states is also discussed. At the reverse biased region, field effected thermionic emission model is found to be dominant flow mechanism, and leakage current behavior is explained by Schottky effect. Solar simulator with different illumination intensities is used to investigate photo-generated carrier contribution and photo-response of the diodes.
Citation - WoS: 25
Citation - Scopus: 26
Determination of Current Transport Characteristics in Au-cu/Cuo Schottky Diodes
(Elsevier, 2019) Surucu, O. Bayrakli; Gullu, H. H.; Terlemezoglu, M.; Yildiz, D. E.; Parlak, M.
In this study, the material properties of CuO thin films fabricated by sputtering technique and electrical properties of CuO/n-Si structure were reported. Temperature-dependent current-voltage (I-V) measurement was carried out to determine the detail electrical characteristics of this structure. The anomaly in thermionic emission (TE) model related to barrier height inhomogeneity at the interface was obtained from the forward bias I-V analysis. The current transport mechanism at the junction was determined under the assumption of TE with Gaussian distribution of barrier height. In this analysis, standard deviation and mean zero bias barrier height were evaluated as 0.176 and 1.48 eV, respectively. Depending on the change in the diode parameters with temperature, Richardson constant was recalculated as 110.20 Acm(-2)K(-2) with the help of modified Richardson plot. In addition, density of states at the interface were determined by using the forward bias I-V results.

Journal	Count
Journal of Materials Science: Materials in Electronics	16
Physica B: Condensed Matter	7
Bulletin of Materials Science	3
Materials Science in Semiconductor Processing	3
Optik	3

Güllü, Hasan Hüseyin

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NO POVERTY

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GOOD HEALTH AND WELL-BEING

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AFFORDABLE AND CLEAN ENERGY

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Scholarly Output

55

Articles

52

Views / Downloads

33/9

Supervised MSc Theses

1

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0

WoS Citation Count

890

Scopus Citation Count

918

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0

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0

WoS Citations per Publication

16.18

Scopus Citations per Publication

16.69

Open Access Source

8

Supervised Theses

1

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