Regensburg 2019 – wissenschaftliches Programm
HL 45.1: Poster
Donnerstag, 4. April 2019, 18:30–21:00, Poster E
Deep Level Transient Spectroscopy on Perovskite Solar Cells — •Florian Schwarz1, Mathias Fischer1, Andreas Baumann2, and Vladimir Dyakonov1 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
In thin-film perovskite solar cells (PSC) charge carriers can be captured by trap states located in the active layer or at the interface towards the transport layers, which often results in a reduced performance of the device. Therefore different techniques were established for the characterization of charge carrier trapping. One popular method is the so-called ’-deep level transient spectroscopy-’ (DLTS), which allows to determine the emission rate, capture cross-section and activation energy of such deep states close to the middle of the band gap. We use DLTS to investigate the defect formation in PSC with respect to the incorporation of different additives, which may play a role of dopants, to the methylamonium lead iodide (MAPI) layer. The knowledge about the impact of such additives on the defect formation in the PSC is an essential step towards a controlled doping of the perovskite absorber itself.