DOI: https://doi.org/10.29363/nanoge.incnc.2021.062
Publication date: 8th June 2021
In this talk, I will describe recent experimental and computational work to understand the phononic properties in chalcogenide and perovskite nanocrystals and their impact on optoelectronic properties, including linewidths, carrier cooling, and recombination [1-5]. I will explain how we can measure and calculate phonon density of states and electron-phonon coupling strengths in nanocrystals and investigate trends with nanocrystal size and defects. Across systems, we find that large emission linewidths and efficient intraband transitions result from strong coupling, in particular, to surface phonons. We describe strategies to mitigate this through surface engineering, and, in the perovskite system (ABX3), we also examine the role of the A-cation in the phononic properties of the system [3, 6-7].
[1] D. Bozyigit, et al., Nature, 2016, 531, 618.
[2] N. Yazdani, et al. J. Phys. Chem. Lett., 2018, 9, 1561–1567.
[3] N. Yazdani, et al. Nano Lett. 2018, 18, 2233–2242.
[4] N. Yazdani, et al. ACS Photonics 2020, 7, 1088–1095.
[5] L. Piveteau, et al. ACS Cent. Sci. 2020, 6, 1138–1149.
[6] G. Raino, et al. submitted.
[7] N. Yazdani, et al. in preparation.
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