Autobalanced photoreceiver based on erbium CdS doped thin films

By employing chemical bath deposition, polycrystalline thin films of CdS were grown on glass substrates. During the process of growth relative volumes of nitrate of erbium penta- hydrate (Er(NO3)35H2O) were added in aqueous solution of CdS in order to obtain different levels of doping, the samples obtained by this method were electrically and optically characterized determining the dark conductivity, and photoconductivity in the 590 to 451 nm range respectively, afterwards, the most suitable sample with optimal electrical and optical characteristics was chosen to develop an autobalanced photo receiver which uses the photoconductive properties of CdS for electronically auto compensate the intensity difference between the signal and reference sensor.