Structural Analysis : Pbs Synthesized By Different Technique

1380 WordsOct 23, 20166 Pages
Structural analysis of PbS synthesized by different technique Introduction: Semiconductor Nps and thin films have recently attracted much attention due to their applications in optoelectronics, photocatalysis, microelectronics, energy conversion industries and nonlinear optics [1-3]. These materials have been a new generation of advanced materials due to their novel structural, morphological, optical and electrical properties originating from size quantization [4]. PbS is an important IV-VI semiconductor material because of its direct bandgap of 0.41 eV and its exciton Bohr radius of 18nm at room temperature. Therefore when crystal sizes are smaller than the Bohr radius, such a small bandgap and a large exciton Bohr radius make it as an interesting system for studying the effect of size confinement. PbS Nps may also be useful in electroluminescent devices such as light emitting diodes and optical switch devices. Many physical and chemical properties such as melting point, color, bandgap, optical and electronic properties of materials strongly depend on the particle sizes [5-8]. Different morphologies can play roles in the properties. They include nanocrystals [9], nanorods [10-11], nanotubes [10], nanocubes [12], star shapes [13], dendrites [12, 14], and flower-like crystals [15]. All can be prepared by different methods, such as hydrothermal and solvothermal [16, 12], vacuum deposition [17], electrochemical deposition [18], pulsed laser deposition [19], microwave

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