Study of the photovoltaic properties of small-molecule-doped porphyrin polymers

Abstract Doping is a widely used method in semiconductor materials to introduce specific compounds, which plays a crucial role in molecular assembly and functionalization. In this study, the doping of porphyrin small molecules into porphyrin polymers was successfully conducted at various ratios. The results reveal that the UV absorption spectra exhibit absorption peaks ranging from 400 nm to 650 nm. Furthermore, the doped combination demonstrates impressive air stability, as evidenced by the HOMO energy levels being below the critical threshold for conjugated polymers in air (-5.2 eV). This feature guarantees the material’s stability under typical atmospheric conditions. Moreover, the calculated LUMO levels are approximately 0.49-0.53 eV higher than the acceptor PCBM, indicating the potential of the doped material to function as an efficient donor component in solar cells. The successful doping of porphyrin small molecules into porphyrin polymers not only expands the range of available materials but also provides promising prospects for applications in optoelectronic devices. The capability to adjust the doping ratio enables precise customization of the properties of the resulting materials, rendering them suitable for a wide range of technological advancements. Overall, this study demonstrates the potential of doped porphyrin polymers as efficient donors in solar cells, highlighting their significance in renewable energy research.