Phenylgermanium trichloride is primarily used in the field of organometallic chemistry as a precursor for synthesizing various germanium-containing compounds. It plays a significant role in the development of materials for optoelectronics, where it is utilized to create germanium-based polymers and semiconductors. Additionally, it serves as a key intermediate in the production of catalysts for organic transformations, particularly in reactions involving carbon-germanium bond formation. Its applications also extend to research in nanotechnology, where it is employed to fabricate germanium nanostructures with potential uses in sensors and electronic devices.