Presentation description

Organo-metal halide perovskites are widely popular in modern semiconductor research due to their straightforward fabrication and widely tunable bandgaps. The soft lattice structure and intrinsic defects of these semiconductors facilitate ion migration under applied external biases- a characteristic that allows for increased optoelectronic tuning possibilities. By using electroabsorption (EA) spectroscopy and leveraging the Franz-Keyldsh effect, the time dependence of ion migration in organo-metal halides can be derived by looking at ion induced screening of electric fields in thin films.

Normalized EA data for butylammonium and phenylethylammonium lead iodide perovskites has been collected to demonstrate how transmission and phase-sensitive signals complement each other in measuring ion migration mechanisms. These results lay important groundwork for ongoing efforts to understand how butylammonium-doped methylammonium lead iodide perovskites respond to external biases in the presence of quantum well structures. Further analysis will reveal how organic cation doping can be used to tune ion migration and influence lattice orientation during film fabrication.