Nanoscale spatial mapping of charge carrier dynamics in perovskite solar cells

Behzad Bahrami, Ashraful Haider Chowdhury, Ashim Gurung, Sally Mabrouk, Khan Mamun Reza, Sheikh Ifatur Rahman, Rajesh Pathak, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Charge carrier dynamics and behaviors are key parameters and need to be mapped at the nanoscale in order to search for correct materials for high-performance solar cells. Unfortunately, currently, there are no existing tools or capabilities that can simultaneously map charge carrier dynamics at nanometer range in solar cells. Here we use a Transient Photo-response AFM (TP-AFM) to map for the first time apparent carrier recombination lifetime (τr), transport time (τt) and diffusion length (LD) in hybrid perovskites solar cells. These spatially resolved parameters reveal substantial variations at grain boundaries (GBs) of perovskites. Improved τr, τt and LD at GBs broaden the performance of these state-of-the-art mixed cation perovskites. Detail analysis of these parameters allow us to conclude that reduced density of trap states and recombination in mixed cation perovskites at GBs and its surrounding locations (extending to several nanometers into the grain interior) implies less ion migration. This first of its kind experimental realization of nanoscale mapping of charge carrier dynamics in photovoltaic materials can be used for applications in other optoelectronic devices.

Original languageEnglish (US)
Article number100874
JournalNano Today
StatePublished - Aug 2020
Externally publishedYes


  • Charge carrier dynamics
  • Grain boundary
  • Nanoscale mapping and ion migration
  • Perovskites

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • General Materials Science
  • Pharmaceutical Science


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