Ultrafast Carrier Drift Transport Dynamics in CsPbI3 Perovskite Nanocrystalline Thin Films

Kanishka Kobbekaduwa, Exian Liu, Qian Zhao, Jasjit Singh Bains, Jianbing Zhang, Ying Shi, Haimei Zheng, Dawen Li, Tong Cai, Ou Chen, Apparao Rao, Matthew Beard, Joseph Luther, Jianbo Gao

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

We study the early time carrier drift dynamics in CsPbI3 nanocrystal thin films with a sub 25 ps time resolution. Prior to trapping, carriers exhibit band-like transport characteristics, which is similar to those of traditional semiconductor solar absorbers including Si and GaAs due to optical phonon and carrier scattering at high temperatures. In contrast to the popular polaron scattering mechanism, the CsPbI3 nanocrystal thin film demonstrates the strongest optical phonon scattering mechanism among other inorganic-organic hybrid perovskites, Si, and GaAs. This ultrafast dynamics study establishes a foundation for understanding the fundamental carrier drift properties that drive perovskite nanocrystal optoelectronics.

Original languageAmerican English
Pages (from-to)13997-14004
Number of pages8
JournalACS Nano
Volume17
Issue number14
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-87066

Keywords

  • mobility
  • phonons
  • photocurrent
  • polarons
  • scattering

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