PTB7 is widely used in the field of organic photovoltaics (OPVs) due to its excellent light absorption and charge transport properties. It serves as a key component in the active layer of polymer solar cells, where it is often blended with fullerene derivatives like PCBM to enhance the efficiency of energy conversion. The material's ability to absorb a broad range of solar spectra makes it highly effective in converting sunlight into electricity. Additionally, PTB7 is utilized in the development of flexible and lightweight solar panels, which are increasingly important for portable electronic devices and renewable energy applications. Its compatibility with solution-processing techniques also allows for cost-effective and scalable manufacturing of solar cells.