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Localized holes and delocalized electrons in photoexcited inorganic perovskites: Watching each atomic actor by picosecond X-ray absorption spectroscopy.
Santomauro, Fabio G; Grilj, Jakob; Mewes, Lars; Nedelcu, Georgian; Yakunin, Sergii; Rossi, Thomas; Capano, Gloria; Al Haddad, André; Budarz, James; Kinschel, Dominik; Ferreira, Dario S; Rossi, Giacomo; Gutierrez Tovar, Mario; Grolimund, Daniel; Samson, Valerie; Nachtegaal, Maarten; Smolentsev, Grigory; Kovalenko, Maksym V; Chergui, Majed.
Afiliación
  • Santomauro FG; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Grilj J; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Mewes L; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Rossi T; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Capano G; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Al Haddad A; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Budarz J; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Kinschel D; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Ferreira DS; Paul Scherrer Institut , CH-5232 Villigen, Switzerland.
  • Rossi G; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Gutierrez Tovar M; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
  • Grolimund D; Paul Scherrer Institut , CH-5232 Villigen, Switzerland.
  • Samson V; Paul Scherrer Institut , CH-5232 Villigen, Switzerland.
  • Nachtegaal M; Paul Scherrer Institut , CH-5232 Villigen, Switzerland.
  • Smolentsev G; Paul Scherrer Institut , CH-5232 Villigen, Switzerland.
  • Chergui M; Laboratoire de Spectroscopie Ultrarapide, ISIC-FSB and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
Struct Dyn ; 4(4): 044002, 2017 Jul.
Article en En | MEDLINE | ID: mdl-28083541
We report on an element-selective study of the fate of charge carriers in photoexcited inorganic CsPbBr3 and CsPb(ClBr)3 perovskite nanocrystals in toluene solutions using time-resolved X-ray absorption spectroscopy with 80 ps time resolution. Probing the Br K-edge, the Pb L3-edge, and the Cs L2-edge, we find that holes in the valence band are localized at Br atoms, forming small polarons, while electrons appear as delocalized in the conduction band. No signature of either electronic or structural changes is observed at the Cs L2-edge. The results at the Br and Pb edges suggest the existence of a weakly localized exciton, while the absence of signatures at the Cs edge indicates that the Cs+ cation plays no role in the charge transport, at least beyond 80 ps. This first, time-resolved element-specific study of perovskites helps understand the rather modest charge carrier mobilities in these materials.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Struct Dyn Año: 2017 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Struct Dyn Año: 2017 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Estados Unidos