Proceedings of Online Meetup: Origins of Electronic Defects in Halide Perovskites (EDHP)
Publication date: 1st April 2020
In this presentation, we describe the use if anodized porous Si as well as silica particles as templates for the formation of methylammonium lead trihalide nanostructures with average pore diameter of 7-18 nm to access relatively small perovskite domains and compare the associated interfacial chemistry between an as-prepared hydrophobic hydride-terminated functionality and that of a hydrophilic oxide-terminated system. It is found that while physical confinement of MAPbBr3 has a uniform effect on carrier lifetime, the pore size of the silicon-containing template has a sensitive influence on the resultant perovskite photoluminescence (PL) wavelength maximum. Furthermore, the identity of surface functionality of the template significantly alters the PL quantum efficiency, with the lowest perovskite PL intensity associated with the H-terminated pSi and the most intense perovskite PL affiliated with the oxide-terminated pSi surface.
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