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Persistent photovoltage in methylammonium lead iodide perovskite solar cells

A. BaumannBavarian Center for Applied Energy Research e.V. (ZAE Bayern) 1 , 97074 Würzburg, GermanyK. TvingstedtJulius-Maximilian University of Würzburg 2 Experimental Physics VI, , 97074 Würzburg, GermanyM. C. HeiberJulius-Maximilian University of Würzburg 2 Experimental Physics VI, , 97074 Würzburg, GermanyS. VäthJulius-Maximilian University of Würzburg 2 Experimental Physics VI, , 97074 Würzburg, GermanyC. MomblonaUniversidad de Valencia 3 Instituto de Ciencia Molecular, , C/Catedrático J. Beltrán 2, 46980 Paterna, Valencia, SpainH. J. BolinkUniversidad de Valencia 3 Instituto de Ciencia Molecular, , C/Catedrático J. Beltrán 2, 46980 Paterna, Valencia, SpainV. DyakonovBavarian Center for Applied Energy Research e.V. (ZAE Bayern) 1 , 97074 Würzburg, Germany

2014en

ABI

Annotatsiya

We herein perform open circuit voltage decay (OCVD) measurements on methylammonium lead iodide (CH3NH3PbI3) perovskite solar cells to increase the understanding of the charge carrier recombination dynamics in this emerging technology. Optically pulsed OCVD measurements are conducted on CH3NH3PbI3 solar cells and compared to results from another type of thin-film photovoltaics, namely, the two reference polymer–fullerene bulk heterojunction solar cell devices based on P3HT:PC60BM and PTB7:PC70BM blends. We observe two very different time domains of the voltage transient in the perovskite solar cell with a first drop on a short time scale that is similar to the decay in the studied organic solar cells. However, 65%–70% of the maximum photovoltage persists on much longer timescales in the perovskite solar cell than in the organic devices. In addition, we find that the recombination dynamics in all time regimes are dependent on the starting illumination intensity, which is also not observed in the organic devices. We then discuss the potential origins of these unique behaviors.

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DOI: 10.1063/1.4885255

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