Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.049
Publication date: 21st November 2018
In this talk we will describe a series of recent ultrafast spectroscopic studies of LHP materials. In the first we have used extreme time resolution pump-probe spectroscopy to characterize the earliest stages of free carrier generation in a thin film of organic lead iodide perovskite. We find an initial short lived state (~20 fs) which reflects localized hot carrier pairs, which evolve rapidly into delocalized free carriers inducing the well known absorption bleaching due to state filling.
In a second study, pump probe data in large cesium lead iodide nanocrustals is compared with that in a thin film of the same material. the results show essentially identical transient transmission spectra in both materials, proving the the gradual buildup of reduced transmission to the blue of the exciton band, assigned by others to light induced changes in reflectivity, are in fact due to induced absorption. The correct assignment of these features is crucial for the correct interpretation of the observed spectral changes.
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