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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: Vortrag

Montag, 20. März 2017, 18:00–18:15, ZEU 222

Electrical impedance spectroscopy on perovskite solar cells — •Fischer Mathias¹, David Kiermasch¹, Vladimir Dyakonov^1,2, 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.