Abstract
This project involved lead-halide perovskite thin films, a promising novel solar cell material. The goal was to monitor the composition of the samples during degradation from blue light exposure using vibrational spectroscopy. IR and THz spectroscopy measured the composition of the samples in-situ between periods of blue light exposure, probing the N-H and Pb-I vibrational modes. Plotting MA and MAPI concentrations versus blue light exposure showed that the MA and MAPI concentrations initially decreased in a gradual linear fashion until a threshold photon flux where both vibrational absorption bands simultaneously collapsed. This suggests that there is a discontinuous change in the material once it reaches the threshold photon flux.
Recommended Citation
Dau, Addison; Dale, Ethan; and Heyman, James
(2025)
"Monitoring the Degradation of Methylammonium Lead Iodide Perovskite Thin Films by UV Exposure,"
Macalester Journal of Physics and Astronomy: Vol. 13:
Iss.
1, Article 5.
Available at:
https://digitalcommons.macalester.edu/mjpa/vol13/iss1/5