Caracterização da eletrodeposição de filmes finos de CdTe sobre Pt em meio ácido

Abstract

The electrodeposition has been used for obtaining semiconductor materials; however, remain unclear the mechanisms involved in this process. Thus, this paper presents the research of this process, showing the characterization of electrodeposited CdTe on platinum substrate in acid solution. The deposition occurs from 0.0 V relative to the electrode Ag/AgCl KClsat with step activated control and diffusion. The thin film of CdTe was electrodeposited on the platinum substrate at room temperature (~ 24 ° C) from an acidic solution. The influence of the applied potential was investigated using surface characterization techniques such as Xray diffraction analyses and scanning electron microscopy. The electrical properties of the films were performed capacitance measurements (Mott-Schottky plot). The thin CdTe films presented the prominent (220) planes, showing have a preferential growth in that plane. The films show a granular morphology influenced by deposition potential and property of an n-type semiconductor.