Synthesis, characterization and interpretation of screen-printed nanocrystalline CdO thick film for optoelectronic applications

Abstract

The transparent conductive oxide CdO thick films are prepared by screen printing method followed by sintering route. The structural, optical and electrical properties of as-grown films are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared (FTIR), ultraviolet-visible (UV-VIS) and DC conductivity measurement techniques. XRD, SEM and AFM studies reveal that the film deposited is polycrystalline, single phase and granular in nature. The crystallite size from XRD pattern's most strong (111) peak calculated using Debye-Scherrer's formula is 30 nm. IR transmission spectrum exhibits Cd-O stretching and bending mode peaks at 831 and 672 cm-1 , respectively. Electrical properties were characterized by two-probe measurement in the temperature range between 300 and 400 K. Optical transmission spectroscopy and DC conductivity measurements have revealed the semiconducting nature of this film with direct band gap energy 2.53 and 0.29 eV activation energy and dc conductivity 4.5 9 10-7 ('Xcm)-1 .

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

“…The pattern of CdO:10%In 2 O 3 show two diffraction peaks at 2 values of 33.28° and 38.54° corresponded to pure CdO, which are well-matched, respectively with the (111) and (200) planes of the cubic CdO phase according to JCPDS card No. 05-0640 [25]. The low intensity of the observed diffraction peaks suggests a randomly distributed orientation of the crystallites.…”

Towards the high-throughput prediction of finite-temperature properties using the quasi-harmonic approximation

“…ZnO is non-toxic and relatively abundant, is characterised by a large band gap and low resistivity [45], and has outstanding optical and piezoelectronic properties that make it an ideal candidate for use in visible and ultraviolet light emitters, laser diodes and transparent field-effect transistors [47][48][49][50]. Similarly, CdO has found applications in solar cells, gas sensors, phototransistors and many other electronic and optoelectronic devices [46,51].…”

The effects of CuO doping on structural, electrical and optical properties of CdO thin films deposited by pulsed laser deposition technique

“…In addition, they are selectively transmitting layers i.e. they have high transmittance in the visible region and reflective to infrared radiation [3]. Studies have shown that CdO possess band gap in the range 2.2 to 2.8 eV, resistivity value of (10 -2 -10 -4 Ω.cm) and showed negative conductance [4,5].…”