IJFANS International Journal of Food and Nutritional Sciences

ISSN PRINT 2319 1775 Online 2320-7876

Hydrothermal Synthesis and Characterization Of Tbx Pb1-XTe Nanomaterials: Physical and Optical Properties

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Chandrakumari. M, Dr. K. Rajendran


The photovoltaic cells are very important due to their use as an alternate source of electricity. The first generation of photovoltaic cells is based on a single p-n junction of a crystalline-Si, exhibiting a power conversion efficiency of 15-20%. The poor absorbing properties of the crystalline Si and its high production cost have led to the use other various materials for photovoltaic technologies. The binary IV-VI compounds are the oldest known semiconducting materials used as photovoltaic materials and the most prominent representatives such as PbS, PbSe and PbTe, have been used for more than 100 years for electric and optoelectronic device applications. The first reported solid-state diode has been made from single crystal PbS in 1874 by Ferdinand Braun [1] and its rectifying properties have been exploited in the early radio receivers. The IV-VI compounds present specific electronic and transport properties, such as narrow band gaps, low resistivities, large carrier mobilities and positive temperature coefficients [2,3]. The phase transformation in the system GeSe-GeTe has been studied by Muir and Beato [16]. They have observed that a rhombohedral-cubic transformation occurs at 370 ± 10°C in alloys based on the GeTe structure and with composition in the range 0–55 mol% GeSe. The temperature and composition dependence of lattice parameters also have been determined for these alloys. Bhatia et al [17] have observed the first order transition in single crystals GeSe near 6 GPa.

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