Photoinduced reversible structural transformations in free-standing CH3NH3PbI3 perovskite films

Ronen Gottesman, Laxman Gouda, Basanth S. Kalanoor, Eynav Haltzi, Shay Tirosh, Eli Rosh-Hodesh, Yaakov Tischler, Arie Zaban, Claudio Quarti, Edoardo Mosconi, Filippo De Angelis

Research output: Contribution to journalArticlepeer-review

195 Scopus citations


In the pursuit to better understand the mechanisms of perovskite solar cells we performed Raman and photoluminescence measurements of free-standing CH3NH3PbI3 films, comparing dark with working conditions. The films, grown on a glass substrate and sealed by a thin glass coverslip, were measured subsequent to dark and white-light pretreatments. The extremely slow changes we observe in both the Raman and photoluminescence cannot be regarded as electronic processes, which are much faster. Thus, the most probable explanation is of slow photoinduced structural changes. The CH3NH3PbI3 transformation between the dark and the light structures is reversible, with faster rates for the changes under illumination. The results seem to clarify several common observations associated with solar cell mechanisms, like performance improvement under light soaking. More important is the call for solar-cell-related investigation of CH3NH3PbI3 to take the photoinduced structural changes into consideration when measuring and interpreting the results.

Original languageEnglish
Pages (from-to)2332-2338
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number12
StatePublished - 18 Jun 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.


  • Raman
  • illumination
  • photoluminescence
  • solar cell
  • thin film


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