Copper(I) thiophene-2-carboxylate is an organometallic coordination compound. It features a copper(I) center coordinated to thiophene-2-carboxylate ligands. This compound is a solid, typically appearing as a light-colored to brownish powder, and is sensitive to air and moisture, often requiring storage under inert atmosphere. Its primary application is in the field of materials science, particularly as a precursor for the synthesis of copper-based nanomaterials and thin films. It is notably used in the preparation of copper sulfide (Cu2S) nanocrystals and thin films via solution-processable routes, such as spin-coating or dip-coating followed by thermal decomposition. These Cu2S materials are of significant interest for applications in photovoltaics (e.g., as a hole-transport layer or an absorber material in solar cells) and thermoelectrics due to their favorable optoelectronic properties. As an organocopper compound, it also serves as a reagent in organic synthesis, particularly in cross-coupling reactions or as a source of copper for catalysis. However, its use in mainstream organic synthesis is less common compared to more standard organocopper reagents like Gilman reagents, making its role more specialized within the context of materials precursor chemistry.