Long-Range Hot-Carrier Transport in Hybrid Perovskites Visualized by Ultrafast Microscopy

Kai Zhu, Mengjin Yang, Zhi Guo, Yan Wan, Jordan Snaider, Libai Huang

Research output: Contribution to journalArticlepeer-review

449 Scopus Citations

Abstract

The Shockley-Queisser limit for solar cell efficiency can be overcome if hot carriers can be harvested before they thermalize. Recently, carrier cooling time up to 100 picoseconds was observed in hybrid perovskites, but it is unclear whether these long-lived hot carriers can migrate long distance for efficient collection. We report direct visualization of hot-carrier migration in methylammonium lead iodide (CH3NH3PbI3) thin films by ultrafast transient absorption microscopy, demonstrating three distinct transport regimes. Quasiballistic transport was observed to correlate with excess kinetic energy, resulting in up to 230 nanometers transport distance that could overcome grain boundaries. The nonequilibrium transport persisted over tens of picoseconds and ∼600 nanometers before reaching the diffusive transport limit. These results suggest potential applications of hot-carrier devices based on hybrid perovskites.

Original languageAmerican English
Pages (from-to)59-62
Number of pages4
JournalScience
Volume356
Issue number6333
DOIs
StatePublished - 7 Apr 2017

Bibliographical note

Publisher Copyright:
© 2016 by the American Association for the Advancement of Science; all rights reserved.

NREL Publication Number

  • NREL/JA-5900-68003

Keywords

  • efficiency
  • hot-carrier devices
  • hybrid perovskites
  • transport

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