Speaker
Description
Perovskite Nanocrystal Solar Cells (PNCSC) hold great promise for future renewable energy solutions. Utilizing Perovskite Nanocrystal Layers as the active layer in solar cells exploits quantum confinement, if the crystal size is below the Bohr radius [1], resulting in high power conversion efficiencies, a high photoluminescence quantum yield (PLQY), a narrow photoluminescence (PL) peak, and enhanced stability compared to bulk perovskite.[1] To ensure that the nanocrystal size is stabilized, so-called ligands are attached during synthesis as organic compounds. The versatility of X halides (I-, Br-, Cl-) and A cations (FA+, MA+, Cs+) allows precise bandgap control across the visible spectrum of the ABX3 perovskite structure.[2]
This study focuses on Cesium Lead Iodide (CsPbI) and Formamidinium Lead Iodide (FAPbI) perovskite nanocrystal layers. Grazing incidence x-ray scattering (GIXS) is used to reveal crystal structure and texture. Because X-rays primarily probe the crystals, GISANS provides complementary sensitivity to the organic ligands due to their different contrast. By combining both techniques, a comprehensive understanding of the PNC thin film, including its crystals and ligands, is obtained.
[1] L. Liu et al., Adv. Sci. 9.7, 2104577 (2022)
[2] L. Protesescu et al. Phys. Nano. Lett. 15.6, 3692–3696 (2015)
