High-Efficiency Ternary Organic Radioisotope Photovoltaic Battery Based on Tritium-Induced Fluorescent Source

In response to the urgent demand for miniaturised and long-life energy sources for MEMS, this paper proposes the design andpreparation of an organic flexible irradiated photovoltaic isotope cell based on a tritium light source, aiming to achieve the unity of highperformance, low cost and flexible miniaturisation. The cell adopts 3 H\/ZnS:Cu as the irradiated fluorescence light source, selects the organicwide bandgap system P3HT:ICBA as the photovoltaic active layer, and introduces the third component PM6 to construct the ternary systemdevice of P3HT:PM6:ICBA, which significantly enhances the spectral matching between the photovoltaic device and the light source as wellas the photovoltaic conversion efficiency. Theoretical calculations and device electrical performance simulation results show that theintroduction of PM6 helps to form a good cascade energy level structure between P3HT, PM6 and ICBA, effectively reduces the excitonbinding energy, improves the average hole mobility, and broadens the spectral absorption range. Ultimately, the ternary system exhibitsexcellent electrical output performance under tritium light source, with a photovoltaic conversion efficiency of 11.33%, which is 6.30%higher than that of the binary system. In addition, this paper innovatively designs millimetre-scale columnar organic irradiated photovoltaicisotope cell structure, which achieves a high degree of device integration and flexibility, and provides a new technological path for micro\u0002energy supply in the fields of MEMS, implantable medical devices, and extreme environment detection.