Detection of current transport mechanisms for graphene-doped-PVA interlayered metal/semiconductor structures

Baydilli E. E., Tan S. O., Tecimer H. U., Altindal Ş.

PHYSICA B-CONDENSED MATTER, cilt.598, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 598
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.physb.2020.412457
  • Dergi Adı: PHYSICA B-CONDENSED MATTER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Current-transport mechanisms, Metal-polymer-semicondutor, Thermionic emission, Barrier height, Graphene doping, SCHOTTKY-BARRIER DIODES, CURRENT-VOLTAGE CHARACTERISTICS, DOUBLE GAUSSIAN DISTRIBUTION, I-V, AU/N-GAAS, TEMPERATURE-RANGE, CONDUCTION MECHANISMS, ELECTRICAL-PROPERTIES, HEIGHTS, SI
  • Gazi Üniversitesi Adresli: Evet

Özet

The possible current-transport mechanisms (CTMs) of Au/(%7Gr-doped)PVA/n-GaAs structure was examined between 80 K and 360 K. The forward bias semi-logarithmic I-V curves have two different linear regions; as 0.30 V and 0.56 V (Region I), and 0.72 V and 0.92 V (Region II). Contrary to classical thermionic emission (TE) theory, the ideality factor (n) decreases but the zero bias barrier height (Phi(Bo)) increases while the temperature increases for both regions. The plots of n vs Phi(B0), q/2 kT vs Phi(Bo) and q/2 kT vs n(-1)-1 have two linear regions from 80 K to 160 K and 180 K-360 K. This indicates the Double Gaussian Distribution (DGD). Experimental Richardson constant (A*) was acquired as 8.73 A/cm(2)K(2) and 8.14 A/cm(2)K(2) for Region I and II which are quite close to theoretical A* value for n-GaAs. Consequently, the predominant CTMs at M/S interfaces can be clarified by DGD on the basis of TE.