Triethylgermanium chloride is primarily utilized in the field of organometallic chemistry as a precursor for the synthesis of other germanium-containing compounds. It plays a significant role in the development of advanced materials, particularly in the production of semiconductors and optoelectronic devices. The compound is also employed in catalysis, where it facilitates various organic transformations, enhancing the efficiency of chemical reactions. Additionally, it finds application in research and development for studying the properties and behavior of germanium-based organometallics, contributing to innovations in material science and nanotechnology.