Dresden 2017 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Fundamentals of Perovskite Photovoltaics II (joint session CPP/DS/HL)
CPP 8.9: Talk
Monday, March 20, 2017, 18:00–18:15, ZEU 222
Electrical impedance spectroscopy on perovskite solar cells — •Fischer Mathias1, David Kiermasch1, Vladimir Dyakonov1,2, and Andreas Baumann2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research, 97074 Würzburg
Electrical impedance spectroscopy has shown to be a powerful technique to obtain informations about key parameters of a solar cell, like series and recombination resistance, build-in potential and the dielectric constant. Here, we performed impedance measurements over a wide temperature range from 300K down to 150K on solution processed CH3NH3PbI3 perovskite solar cells. We compared the impedance spectra of n-i-p and p-i-n device configuration which is FTO/TiO2/Perovskite/Spiro-MeOTAD/Au and ITO/PEDOT:PSS/Perovskite/PC60BM/C60/BCP/Au, respectively. We fit the impedance spectra by using corresponding equivalent circuits to investigate the dielectric behavior depending on the cell layout and preparation technique. We compare the extracted time constants at different frequency domains to reveal the influence from the p- and n-layer materials on the photovoltaic properties of the perovskite absorber material itself and examined charge carrier recombination behavior in dependency of illumination intensity.