Mercury(II) selenide is primarily utilized in the field of optoelectronics due to its semiconducting properties. It is often incorporated into infrared detectors and sensors, where its ability to detect infrared radiation is highly valued. This compound is also used in the development of photovoltaic cells, contributing to the conversion of solar energy into electrical energy. Additionally, it finds applications in research and development for creating novel materials with specific electronic and optical characteristics. Its role in these advanced technologies underscores its importance in modern scientific and industrial advancements.