14:45 〜 15:00
▲ [24p-E206-6] High Efficiency Tin-Lead Mixed Halides Perovskite Solar Cells via Additive Engineering with Enhanced Electronic Properties and Thermal Stability
キーワード：Perovskite Solar Cells, Tin-lead Perovskites, Stability
In this research, by adjusting the composition of alkali metal cations in the tin-lead mixed halides perovskite, we are able to easily achieve a perovskite device with an efficiency more than 20% with improved electronic properties and thermal stability. The addition of the metal cations as additive has been observed to improve the surface morphology, crystallinity, charge transfer and carrier transport in tin-lead perovskite via using FESEM, XRD, XPS, photo-luminescence and UV-Vis experimental investigations. The overall improvement has been observed by comparing an incorporation of two different metal cation additives; rubidium iodide and potassium iodide. Significant PCE improvement has been achieved with incorporation of either additives with the highest efficiency reached 21.04% in tin-lead mixed halides PSCs with rubidium iodide additive (Voc of 0.85 V, Jsc of 32.1 mA/cm2, fill factor of 0.78). Via simple solution processing technique and spin coating method, the tin-lead mixed halides PSCs with rubidium iodide additive was able to retain 99% of its efficiency after 1 month whereas the incorporation of potassium iodide showed slightly lower percentage of retained efficiency in comparison after kept in the storage. The addition of rubidium iodide offers far more thermally stable tin-lead mixed halide PSCs with retainment of more than 75% efficiency, in comparison with the addition of potassium iodide or without any additives after kept on hot plate at 85 degree Celsius for a week long duration. As a conclusion, we are able to outline the enhancement strategy which yield remarkable efficiency of more than 20% and also thermally stable in tin-lead mixed halides PSCs via additive engineering employing alkali metal cations.