Effect of Water Addition during Preparation on the Early-Time Photodynamics of CH3NH3PbI3 Perovskite Layers

S. Aphrham, Q. Pan, S. F. Zaccarine, K. M. Felter, J. Thieme, K. J.H. van den Nieuwenhuijzen, J. E. ten Elshof, A. Huijser*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


The effect of water addition during preparation of a CH3NH3PbI3 layer on the photodynamics is studied by femtosecond transient absorption. Both the regular perovskite and the aqueous analogue show charge thermalisation on a timescale of about 500 fs. This process is, however, less pronounced in the latter layer. The spectral feature associated with hot charges does not fully decay on this timescale, but also shows a long-lived (sub-ns) component. As water molecules may interfere with the hydrogen bonding between the CH3NH3 + cations and the inorganic cage, this effect is possibly caused by immobilisation of cation motion, suggesting a key role of CH3NH3 + dipole reorientation in charge thermalisation. This effect shows the possibility of controlling hot charge carrier cooling to overcome the Shockley–Queisser limit.

Original languageEnglish
Pages (from-to)3320-3324
Number of pages5
JournalChemPhysChem: a European journal of chemical physics and physical chemistry
Issue number23
Publication statusPublished - 6 Dec 2017


  • cation immobilisation
  • hybrid perovskites
  • photodynamics
  • transient absorption
  • water addition


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