Effect of illumination on electrical parameters of Au/(P3DMTFT)/n-GaAs Schottky barrier diodes


Lapa H. E. , KÖKCE A., ALDEMİR D. A. , ÖZDEMİR A. F. , ALTINDAL Ş.

INDIAN JOURNAL OF PHYSICS, vol.94, no.12, pp.1901-1908, 2020 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 12
  • Publication Date: 2020
  • Doi Number: 10.1007/s12648-019-01644-y
  • Journal Name: INDIAN JOURNAL OF PHYSICS
  • Journal Indexes: Science Citation Index Expanded, Scopus, INSPEC, zbMATH
  • Page Numbers: pp.1901-1908
  • Keywords: Polymer interlayer, Metal-semiconductor contact, Photodiode, Illumination effects, Interface states, 73, 40, Qv, 72, 40, +w, 71, 20, Rv, CAPACITANCE-VOLTAGE CHARACTERISTICS, V CHARACTERISTICS, INTERFACE STATES, CHEMICAL SENSORS, C-V, PLOT

Abstract

Reverse- and forward-bias current-voltage (I-V) data of the Au/(P3DMTFT)/n-GaAs Schottky barrier diodes (SBDs) were measured in dark and at under various illumination levels (from 50 to 200 W with steps of 25 W) for the purpose of examining the change in electrical parameters such as zero-bias barrier height (phi(bo)), ideality factor (n), reverse saturation current (I-o), series resistance (R-s) and shunt resistance (R-sh) with illumination. The values ofn,phi(bo)andI(o)were determined usingI-Vdata in dark as 1.34, 0.91 eV and 7.25 x 10(-12) A, respectively. On the other hand, these parameters were obtained as 1.85, 0.80 eV and 5.11 x 10(-10) A, respectively, when the SBD is exposed to 200 W illumination. The values of shunt resistance (R-sh) and series resistance (R-s) were determined from Ohm's law and shown asR(i)-Vplots. Additionally, Cheung's and modified Norde's functions were also utilized for the extraction ofR(s)in dark and under various illumination levels. The energy density distribution profiles of interface states (N-ss) were investigated for various illumination levels. The dependency of the energy density distribution profiles of interface states (N-ss) on illumination levels was investigated. Obtained results suggest that these electrical parameters are sensitive to illumination. Moreover, Au/(P3DMTFT)/n-GaAs SBDs shows remarkable photovoltaic performance with the values of short-circuit current (I-sc) of 1.45 x 10(-6) A, open-circuit voltage (V-oc) of 0.37 V and fill factor of 0.65 under 200 W illumination.