MECHANICAL MILLED DOPED ZN-BASED SEMICONDUCTORS POWDERS FOR PHOTOVOLTAIC DEVICES

J.I.LABORDE; J.HOYA; M.D.REYES TOLOSA; M. A. HERNANDEZ-FENOLLOSA; L.C. DAMONTE

Córdoba

Conferencia; HYFUSEN; 2013

Instituto de Energía y Desarrollo Sustentable - CNEA

It is known that solar cells efficiency may be improved increasing charge carriers densities and interfacial processes. New kind of materials, different assemblies, etc has been studied during the last decades. In particular, we are interested in nanomaterials, nanopowders and nanocolumns, prepared by low cost methods [1, 2] and its doping with donor elements. Nanosized doped semiconductors (ZnO, ZnSe and ZnTe) were obtained by mechanical milling from metal oxides (In2O3) or the pure metal (In) together with ZnO, ZnSe or ZnTe as starting materials in adequate proportion to obtain the desired concentration. Parameters such as initial concentrations, atmosphere and milling times were varied. Structural and optical characterization of doped powders by X-ray diffraction, Extended X-ray Absorption Spectroscopy (EXAFS), scanning electron microscopy and optical reflection spectroscopy were done. Undoped ZnO, ZnSe and ZnTe nanocrystalline powders prepared in a similar way were analyzed for comparison. These results will allow us to improve the performance of hybrid organic/inorganic solar cells. [1]- ?ZnO Nanoestructured Layers Processing with Morphology Control by Pulsed Electrodeposition?, M. D. Reyes Tolosa, J. Orozco-Messana, L. C. Damonte, and M. A. Hernandez-Fenollosa J. Electrochem. Soc., Volume 158, Issue 7, pp. D452-D455 (2011) [2]-?Structural characterization of mechanical milled ZnSe and ZnTe powders for photovoltaic devices?, J.Hoya, J.I.Laborde and L.C. Damonte, International Journal of Hydrogen Energy, Volume 37, Issue 19, (2012), Pages 14769-14772, DOI:10.1016/j.ijhydene.2011.12.082