Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.203
Publication date: 18th July 2023
Halide perovskite solar cells have revolutionized the photovoltaic field in the last decade. Among other properties direct and tunable bandgap as well as low non-radiative recombination have been a key factors in this success. Moreover, these properties are also fundamental for the development of other optoelectronic devices, which has also extended the application of halide perovskites to other fields such as LEDs, lasers or photocatalytic systems. Nevertheless beyond the interest of this family of materials, and despite a decade of intensive research with improvement in the performance of perovskite devices, the two main drawbacks of this system, the use of hazardous Pb and the long term stability, still to be open questions that have not been fully addressed. Sn-based perovskite solar cells are the devices presenting the highest performance after Pb-based but significantly below them. In addition, Sn-based perovskite solar cells exhibit a long term stability lower than their Pb containing counterparts, making stability their main problem. In this talk, we highlight how the use of proper additives and light soaking for defect engineering can increase significantly the stability of formamidinium tin iodide (FASnI3) solar cells, and discuss about the different mechanism affecting this stability, beyond the oxidation of Sn2+, and how they can be countered. As a second topic of the talk, the use of halide perovskite nanocrystals for the preparation of reproducible perovskite LEDs (PeLEDs) will be analyzed as well as the fabrication of Pb-free Sn-based LEDs by inkjet printing. Improvement of both efficiency and stability of the fabricated devices will be analyzed.