PCDTBT is widely used in the field of organic photovoltaics due to its excellent light absorption and charge transport properties. It serves as a key material in the active layer of polymer solar cells, enhancing their efficiency and stability. Its ability to form favorable blends with fullerene derivatives makes it suitable for bulk heterojunction solar cells, improving power conversion efficiency. Additionally, PCDTBT is utilized in organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFETs) due to its semiconducting characteristics. Its application in these devices contributes to advancements in flexible electronics and renewable energy technologies.