Abstract
Nearly dispersed CuSe and Cu2−xSe crystals were successfully prepared using copper and selenium–triethylene glycol (TEG) solution thermal decomposition using triethylenetetramine (TETA) as the reducing agent and polyvinylpyrrolidone (PVP) as the capping agent at 230°C for 1h. The crystalline structure, electronic and copper selenide particles optical characterization were investigated using transmission electron microscopy (TEM), X-ray diffractometer (XRD), UV–visible absorbance spectra. The TETA addition effects on crystal phase development and morphology were investigated. The obtained copper selenides are CuSe and Cu2−xSe single phase for the samples added with TETA of 0.7 and 2.2ml, respectively. The measured energy gaps for CuSe and Cu2−xSe are 2.0eV and 2.17eV, respectively. These synthesized compounds provide promising candidates for solar cell applications.
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