CuSe

CuSe is a binary inorganic compound consisting of copper and selenium with the formula CuSe. It belongs to the family of copper selenides, which exhibit a range of non-stoichiometric compositions. In simple formulations it is described as copper(II) selenide, but real materials often contain copper vacancies or interstitials that shift the stoichiometry and affect properties.

Synthesis and structure of CuSe can vary with preparation method. It is commonly prepared by direct combination of elemental copper and selenium at elevated temperature under controlled atmosphere, but it can also be made by chemical routes and thin-film deposition techniques. The compound can form several polymorphs depending on temperature and composition, and non-stoichiometric variants with copper deficiencies are common. These defects commonly produce p-type conductivity and influence electronic and optical behavior.

In terms of properties, CuSe typically appears as a dark, metallic-looking solid. It behaves as a semiconductor, with electrical and optical properties that depend on phase, stoichiometry, and microstructure. The presence of copper vacancies and the particular crystal structure can modulate its band structure, making CuSe a subject of interest for electronic, optoelectronic, and thermoelectric research.

Applications and occurrence are mainly in materials science rather than as a natural ore. CuSe and related copper selenides are studied as precursors to other copper selenides, in thin films and nanostructures for photovoltaic, thermoelectric, and catalytic applications. Safety considerations include the toxic nature of selenium compounds, so appropriate handling and disposal are required.