Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

Xiaofan Deng, Xiaoming Wen, Rui Sheng, Shujuan Huang, Takaaki Harada, Tak W. Kee, Martin A. Green, Anita Ho-Baillie

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


Methylammonium Lead Bromide (CH3NH3PbBr3) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH3NH3PbBr3. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH3NH3PbBr3 by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH3NH3PbBr3 is in contact with compact TiO2 (c-TiO2) layer, suggesting better quality CH3NH3PbBr3. when deposited on c-TiO2. The nanosecond decay in CH3NH3PbBr3 film is ascribed to electron-hole recombination. With the presence of c-TiO2 layer, this process is accelerated due to electron transport across the CH3NH3PbBr3/ c-TiO2 interface.

Original languageEnglish
Title of host publicationSPIE Micro+Nano Materials, Devices, and Systems
EditorsBenjamin J. Eggleton, Stefano Palomba
Place of PublicationBellingham, WA
Number of pages6
ISBN (Electronic)9781628418903
Publication statusPublished - 2015
Externally publishedYes
EventSPIE Micro+Nano Materials, Devices, and Applications Symposium - Sydney, Australia
Duration: 6 Dec 20159 Dec 2015

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Micro+Nano Materials, Devices, and Applications Symposium


  • ultrafast spectroscopy
  • perovskite solar cell
  • CH₃NH₃PbBr₃
  • photovoltaics
  • carrier dynamics


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