Charge carrier recombination and electronic trap states in perovskite solar cells
Event details
| Date | 04.02.2016 |
| Hour | 10:00 › 11:30 |
| Speaker | Prof. Dr. Vladimir Dyakonov |
| Location | |
| Category | Conferences - Seminars |
Perovskite solar cells represents a very promising thin-film PV technology with an impressive increase in power conversion efficiency within the last few years already competing with inorganic thin film technologies. However, a fundamental understanding of the working principle of this kind of solar cell material is still lacking. An anomalous hysteresis behavior in the current-voltage characteristics is often reported in perovskite solar cells as well as polarization effects possibly related to the perovskite crystals. Using several electrical and optical complementary experimental techniques, our main aim is to bring more light into the fundamental processes of perovskite solar cells. Transient electrical studies such as the open circuit voltage decay combined with the small perturbation signal experiment of transient photovoltage and charge extraction allows us to look into the charge carrier recombination dynamics. These dynamics detected in complete solar cell devices can be put in relation to the radiative recombination dynamics of transient luminescence as well as to steady state measurements of the absolute luminescence yield. The charge carrier dynamics in perovskite solar cells is influenced by the amount of dopants as well as defects caused by vacancies or interstitials in the crystal. For analysis of such defect levels we apply the experimental technique of thermally stimulated current (TSC) allowing us to estimate both defect concentration and the energetic depth of the defects related to the conduction and valence band.
Practical information
- Informed public
- Free
Organizer
- Prof. Md. k. Nazeeruddin - SCI-SB-MN