Photoluminescence study of hydrogen-dislocations

Abstract EN

In spite of large efforts carried out to improve CdTe growth in order to obtain materials with a good crystalline quality, this one presents also a high defects concentration of physical or chemical origin.

The hydrogenation process seems to be an effective means to reduce the bad effect of defects by means of passivation phenomenon.

Our study is focused on a particular type of defects; dislocations, which are introduced into the material by means of plastic deformation, using Vickers microhardness on Cd(lll) and Te(Ill) faces of n type CdTe crystals.

The hydrogenation was obtained by annealing the samples in closed ampoules at 500°C for 70 hours under deuterium atmosphere with a pressure of 700 mbar.