Copper-selenide and copper-telluride composites powders sintetized by ionic exchange

摘要

At this research it is provide two precursor solutions of selenium ions (Q’) and tellurium ions (Q) used to success easy ways in order to synthetize composites containing mainly the one copper-selenide (CuSe) and the another copper-telluride (CuTe). By Raman spectroscopy the binary copper selenides chemical composition was detected, while from X-Ray photoelectrons spectroscopy (XPS) were observed the binding energies of Se 3d and Cu 2p3 of 53 eV and 953 eV, respectively. The Copper selenide morphology was investigated by TEM observing particles are aggregated. Also, the absorption spectrum of copper selenide corresponds to direct band gap of 2.79 eV and indirect band gap of 1.36 eV. In the same way, Raman spectroscopy of chemical composition of teineite was detected for CuTe formulation, similarly XPS expose the Te 3d region shows that the valence of Te is -2, while the Cu 3p region show valence for the copper of +1. Also, TEM images presents a nanocaterpillar and the diffraction pattern corresponding indicates orthorhombic structures for both samples (CuSe and CuTe). Finally, the absorption spectrum for copper telluride indicates a direct band gap of 3.01 eV and indirect band gap of 2.91 eV.