The Synthesis of Teallite ( PbSnS2 ) From Molecular Precursors

Abstract

Recently there is growing interest in the production of cheap nanomaterial or thin films for photovoltaic applications. Lead and tin chalcogenides are cheapest materials available for solar cell applications. The aim of conducting this research is to produce teallite (PbSnS2) from single source precursors. This paper began by introducing the solids classification which encompasses semiconductors and conductors then the solids band theory was discussed. After that, semiconductors was described through it types; Extrinsic and Intrinsic besides Indirect and Direct Band Gap in details. Further headings were described in details for complete realizing of this research like solar cell and its generations, semiconductors nanoparticles and ways for preparing them and finally, the foremost subject; single source precursors and metal complexes prepared through this technique. The work presented here contains the synthesis of lead and tin chalcogenides Nanocrystals to get teallite (PbSnS2) by melt method from single source precursors. In addition, a comprehensive literature review of teallite Nanocrystals and thin films is presented. Several new lead and tin complexes belonging to xanthate have been synthesized. Bis(O-ethyldithiocarbomato)lead(II), bis(O-propyldithiocarbomato)lead(II), bis(O-ethyldithiocarbomato)tin(II) and bis(O-propyldithiocarbomato)tin(II) complexes of general formula [M(S2COR)2] where M= Pb and Sn, R = Et and nPr and. The cubic and orthorhombic phases and morphology were obtained by Single source precursor. Cubic Lead sulfide (PbS) partials were obtained after pyrolysis using a furnace [Pb(S2COR)2] at 200, 300 and 400 °C, as well as Orthorhombic tin sulfide (SnS). Orthorhombic teallite (PbSnS2) was achieved after mixing lead and tin diethyl xanthate [Pb(S2COEt)2] and [ Sn(S2COEt)2] complexes at the different molar ratio and heating them using the furnace.

Date of Award	1 Aug 2018
Original language	English
Awarding Institution	The University of Manchester
Supervisor	Paul O'Brien (Supervisor) & Sarah Haigh (Supervisor)