Self-powered ZrO2 nanofibers/n-Si photodetector with high on/off ratio for detecting very low optical signal


YILDIRIM F. , ORHAN Z. , Khalili S., Chenari H. M. , Aydogan S.

JOURNAL OF PHYSICS D-APPLIED PHYSICS, vol.54, no.47, 2021 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 47
  • Publication Date: 2021
  • Doi Number: 10.1088/1361-6463/ac203d
  • Title of Journal : JOURNAL OF PHYSICS D-APPLIED PHYSICS
  • Keywords: ZrO2 nanofibers, self-powered photodetector, high rectifying ratio, ON, OFF ratio, responsivity, CAPACITANCE-VOLTAGE CHARACTERISTICS, HIGH-PERFORMANCE, ULTRAVIOLET PHOTODETECTORS, ELECTRONIC TRANSPORT, FULLY TRANSPARENT, SOLAR-CELLS, PARAMETERS, OXIDE, DEPENDENCE, NANOWIRES

Abstract

In this work, a light-sensitive photodetector based on ZrO2 nanofibers (NFs) formed onto n-Si derived by the electrospinning technique was reported. According to the I-V measurements in the dark, the ZrO2 NFs/n-Si has an ohmic current conduction mechanism at low voltages and the SCLC conduction mechanism at medium voltages, while the Fowler-Nordheim tunneling conduction model is dominant at high voltages. The dark current and the rectifying ratio were found to be 9.4 x 10(-10) A (at -1.0 V) and 10 351 (at +/- 1.0 V), respectively. The shunt resistance (R (sh)) (at -1 V) and series resistance (R (s)) (at +2 V) values were determined as 2.0 G omega and 5.5 k omega, respectively from the dark I-V plot. The device was shown to be highly sensitive to light and exhibits self-powering characteristics under illumination. The ON/OFF ratio was about 1.0 x 10(6) at zero-bias (self-powered mode) suggested a good response of the device to the light intensity. The maximum responsivity and specific detectivity were calculated to be 1.44 mA W-1 and 4.5 x 10(8) Jones, respectively. Finally, capacitance and conductance versus bias voltage characteristics of the device were analyzed at various frequencies.