Radiative recombination in perovskite solar cells

Kristofer Tvingstedt^a, Vladimir Dyakonov^a^,^c, Carsten Deibel^b, Olga Malinkiewicz^b, Henk J. Bolink^b, Andreas Baumann^c, Henry J. Snaith^d

^aUniversity of Würzburg EPVI, Am Hubland 97074 Wurzburg

^bBavarian Center for Applied Energy Research, 97074 Wurzburg

^cUniversity of Oxford, Clarendon Laboratory, Parks Road, United Kingdom

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Kristofer Tvingstedt, presentation 173
Publication date: 5th February 2015

Apart from providing a rather high photocurrent, perovskite solar cells also retain a comparatively high open circuit voltage. We herein address the upper limit to open circuit voltage and power conversion efficiency for 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 [1]. We explain the reason for the high voltage and also 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 close to how a good solar cells should do, and in this respect also rather different from most OPVs or DSSC cells studied so far. We further evaluate how various device processing conditions influence these properties.

[1] K. Tvingstedt et. al. Scientific Reports 4 6071 (2014)

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