Mobility-lifetime products in MAPbI3 films
David Cahen a, Igal Levine a, Satyajit Gupta a, Thomas Brenner a, Gary Hodes a, Isaac Balberg b, Oded Millo b, Doron Azulay b
a Weizmann Institute of Science, Herzl St. 234, Rehovot, Israel
b The Racah Institute, The Hebrew University , Israel
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
València, Spain, 2017 March 1st - 2nd
Organizers: Henk Bolink and David Cahen
Oral, Igal Levine, presentation 068
Publication date: 18th December 2016

The enormous recent interest in the Halide Perovskites is mostly motivated by the prospect of high efficiency solar cells. However, while solar cells operate under steady state (or CW) illumination conditions, much of the research in the optoelectronic properties on these materials and cells relies on using illumination pulses of very short duration. Among these studies time-resolved photoluminescence has become one of the standard characterization tools of these systems. However, unlike the qualitative understanding and quantitative models that connect the cell parameters and quantities that are measured by steady state phototransport methods, the relation between these parameters and quantities derived by the transient parameters is not as clear. Hitherto, no model of the steady state recombination scenario in the Halide Perovskites has been proposed. In this work we present such a model that is based on a single type of recombination center, which is deduced from our measurements of the illumination intensity dependence of the photoconductivity and the ambipolar diffusion length in those systems. We also discuss the relation between the present results and those from time-resolved measurements that are commonly reported in the literature.

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