Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 66: Focus Session (CPP with HL): Hybrid photovoltaics and perovskites I

HL 66.9: Talk

Thursday, March 19, 2015, 12:15–12:30, C 130

Radiative efficiency of perovskite solar cells — •Kristofer Tvingstedt¹, Olga Malinkiewicz², Andreas Baumann³, Carsten Deibel¹, Henry J. Snaith⁴, Vladimir Dyakonov^1,3, and Henk J. Bolink² — ¹Experimental Physics VI, Julius-Maximillian University of Würzburg, 97074 Würzburg, Germany — ²Instituto de Ciencia Molecular, Universidad de Valencia, 46980 Paterna, Valencia, Spain — ³Bavarian Center for Applied Energy Research, 97074 Würzburg, Germany — ⁴University of Oxford, Clarendon Laboratory, Parks Road Oxford, OX1 3PU, United Kingdom

Perovskite PVs have reached significant power conversion efficiency in a very short time period. Apart from providing a rather high photocurrent, they also retain a comparatively high open circuit voltage. We here address the upper limit to open circuit voltage and power conversion efficiency for the novel type of photovoltaic cells based on methylammonium lead iodide perovskites. By accurate determination of the present solar cells radiative efficiency, that is their ability to emit light, we conclude how far these solar cells are from their own thermodynamic limit. We explain the reason for the high voltage and put it in relation to those of earlier generation photovoltaic technologies. We further highlight that, as the perovskite steady state photoluminescence is rather strong at open circuit conditions, and substantially quenched only at short circuit, they perform just as good solar cells should do, and in this respect also rather different from most OPVs or DSSC cells studied so far.