Sascha Feldmann1
Harvard University1
Halide perovskites are promising semiconductors for next-generation optoelectronic and spintronic applications. Yet, we still don’t fully understand what governs the charge and spin dynamics in these materials. This is especially true when studying device-relevant thin films of halide perovskites, which lack single-crystalline perfection.<br/>In this talk, I will give an overview of our recent efforts to understand the spin-optoelectronic performance of these films better by using time-, space- and polarization-resolved spectroscopy and microscopy. We will find that the energetically heterogeneous energy landscape in mixed-halide perovskites can lead to the local accumulation of charges, with unexpected consequences for devices [1]; how despite strong differences in vertical diffusivity and across grains charge extraction can remain very efficient [2], and how locally varying degrees of symmetry-breaking drive spin domain formation [3,4] in this fascinating class of solution-processable semiconductors.<br/><br/>[1] Feldmann <i>et al.</i> Nature Photonics 2020<br/>[2] Cho, Feldmann <i>et al</i>. Nature Materials 2023<br/>[3] Ashoka,…, Feldmann & Rao, Nature Materials 2023<br/>[4] Crassous,..., Feldmann, Nature Reviews Materials 2023