Time-resolved Element-selective Probing of Charge Carriers in Solar Materials
James Budarz,
Thomas Rossi,
Dominik Kinschel,
Jochen Rittmann,
Daniel Grolimund,
Thomas Huthwelker,
Chris J. Milne,
M. Hannelore Rittmann-Frank,
Fabio G. Santomauro,
Majed Chergui
Affiliations
James Budarz
Ecole Polytechnique Fédérale de Lausanne Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) ISIC, FSB, CH-1015 Lausanne, Switzerland
Thomas Rossi
Ecole Polytechnique Fédérale de Lausanne Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) ISIC, FSB, CH-1015 Lausanne, Switzerland
Dominik Kinschel
Ecole Polytechnique Fédérale de Lausanne Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) ISIC, FSB, CH-1015 Lausanne, Switzerland
Jochen Rittmann
SwissFEL, Paul Scherrer Institut CH-5232 Villigen PSI, Switzerland
Daniel Grolimund
Swiss Light Source, Paul Scherrer Institut CH-5232 Villigen PSI, Switzerland
Thomas Huthwelker
Swiss Light Source, Paul Scherrer Institut CH-5232 Villigen PSI, Switzerland
Chris J. Milne
SwissFEL, Paul Scherrer Institut CH-5232 Villigen PSI, Switzerland
M. Hannelore Rittmann-Frank
Ecole Polytechnique Fédérale de Lausanne Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) ISIC, FSB, CH-1015 Lausanne, Switzerland
Fabio G. Santomauro
Ecole Polytechnique Fédérale de Lausanne Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) ISIC, FSB, CH-1015 Lausanne, Switzerland
Majed Chergui
Ecole Polytechnique Fédérale de Lausanne Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS) ISIC, FSB, CH-1015 Lausanne, Switzerland. [email protected]
We review our recent results on the implementation of picosecond (ps) X-ray absorption spectroscopy to probe the electronic and geometric structure of centres formed by photoexcitation of solar materials such as TiO2 polymorphs and inorganic Cs-based perovskites. The results show electron localization at Ti defects in TiO2 anatase and rutile and small hole polaron formation in the valence band of CsPbBr3, all within 80 ps. This method is promising for the study of the ultrafast time scales of such processes, especially with the advent of the Swiss X-ray Free Electron Laser (SwissFEL).
