Investigation of physical properties of screen printed nanosized ZnO films for optoelectronic applications
作者： Rayees Ahmad Zargar , Manju Arora , Aurangzeb Khurram Hafiz
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摘要: Nanosized ZnO particles derived from chemical co-precipitation route were used for casting films by screen printing method followed sintering at two different temperatures. The variation in structural, optical and electrical properties of these with temperature have been investigated XRD, SEM, FTIR, Raman, UV-VIS, EPR four probe analytical techniques. XRD patterns exhibit polycrystalline nature hexagonal wurtzite structure SEM images reveal the smooth, dense without any cracks/damage porous surface morphology. Infrared transmission spectra shows peaks pertaining to Zn-O stretching modes their multiphonon modes. While Raman exhibited strong E-2 (high) phonon overtone mode 429 cm(-1) 1144 respectively weak components LO TO branches. direct band gap energy showed narrowing 3.21 eV 3.12 on increasing 500 degrees C 600 C. DC conductivity measurements confirmed semiconducting behaviour lowering activation energy. single narrow line resonance signal g-value similar 1.9469 due oxygen vacancies which are produced during synthesis nanoparticles sol-gel process. These studies revealed that crystallinity film improves reduction lattice deformations printed films.
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