A high-efficiency solid-state dye-sensitized solar cell with P3HT polymer as a hole conductor and an assistant sensitizer

► A high-performance solid-state dye-sensitized solar cell (S-DSC) was fabricated. ► Poly(3-hexylthiophene) functions as effective hole transport material and assistant sensitizer. ► Broader absorption metal-free organic dye (BzTCA) was introduced to optimize the S-DSC efficiency.