Abstract
A conducting polymer, namely poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been employed as an alternative metal counter electrode to study steady state charge conduction through a spin-coated 5.2 µm thick ZnO film in a sandwich structure on a fluorine doped tin oxide coated glass substrate. The room temperature current–voltage characteristics exhibit rectifying behaviour without hysteresis as the bias voltage is cycled between ± 10V for varying voltage sweep rate from 100 to 1000 mV/s. Thermionic emission is believed to be the dominant conduction mechanism at forward bias voltage V ≤ 2.5 V whereas the space charge limited current conduction becomes effective in a higher voltage region V > 2.5 V. The barrier height (φb), ideality factor (n) and series resistance (Rs) are found to be strongly temperature dependent parameters showing the increase of {phi _b} and simultaneous decreases of n and Rs within the range of 218–298 K. The behaviour of the temperature dependent charge carrier mobility in the higher voltage region has also been discussed. The use of PEDOT:PSS is quite promising as an alternative to metal electrodes in semiconductor devices.
Highlights
The optical, electrical/electronic properties and stability of intrinsic conducting polymers are considered to be sufficiently good for their use as alternatives to costly metal electrodes in the low cost production of high volume, large area, and flexible transparent electronic devices [1]
Values of 28.36 nm and 0.01 are found for the average crystallite size D and the strain from the intercept and the slope of the linear plot. These X-ray diffraction (XRD) results indicate the formation of an improved structure of zinc oxide (ZnO) films over ones recently reported for chemical bath deposited ZnO films [20]
The morphological, spectroscopic and optical properties of the ZnO annealed film has been investigated with XRD, Fourier transform infrared spectroscopy (FTIR), and Photoluminescence measurements respectively
Summary
The optical, electrical/electronic properties and stability of intrinsic conducting polymers are considered to be sufficiently good for their use as alternatives to costly metal electrodes in the low cost production of high volume, large area, and flexible transparent electronic devices [1]. 50 nm thick spin-coated PEDOT:PSS films on a single crystal ZnO (0001) is reported to have produced excellent Schottky junctions with a high rectifying ratio of 1010 at ± 2 V, low leakage current of 10 pA up to − 10 V and an ideality factor of 1.2. These results are comparable to those obtained for Schottky junctions with platinum and gold electrodes [12]. Electrical parameters on Schottky diode using RF sputtered ZnO film on the ITO substrate and PEDOT:PSS have recently been reported over the limited bias voltage range of ± 1 V at higher temperatures varying between 302 and 373 K [17]
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