Publication date: 21st July 2025
Control over the electron’s spin (up or down) within the field of spintronics introduces an additional degree of freedom compared to traditional electronics, opening up new opportunities for energy-efficient quantum information technologies. Such applications require a spin-polarized population on timescales ranging from nano- to microseconds. Recent studies on solution-processable lead-halide perovskite semiconductors demonstrated spin lifetimes on the order of a few picoseconds at room temperature — still too short for applications.[1] The short spin lifetime in lead-based halide perovskites is often attributed to the strong spin–orbit coupling that electrons experience due to the presence of heavy elements, like lead and iodide. Moreover, the use of lead-based materials is widely forbidden due to toxicity concerns.
In this talk, I will discuss how the substitution of lead with lighter, less-toxic elements with reduced spin–orbit coupling may be used to manipulate and potentially increase the spin lifetime in halide-perovskite semiconductors using ultrafast polarization-resolved optical spectroscopy. I will discuss the challenges faced when developing lead-free halide-perovskites thin layers and demonstrate the influence of the crystal structure and composition on the observed spin lifetime.
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