Naphtho[2,3-b]thiophene is primarily used in the development of organic semiconductors due to its excellent charge transport properties. It is a key component in the fabrication of organic field-effect transistors (OFETs) and organic light-emitting diodes (OLEDs), where its conjugated structure enhances electrical conductivity and light emission efficiency. Additionally, this compound is utilized in the synthesis of advanced materials for photovoltaic devices, contributing to improved energy conversion in solar cells. Its unique structural properties also make it a valuable building block in organic synthesis for creating complex molecules with potential applications in optoelectronics and photonics.