Publication date: 1st July 2014
We apply Time-Delayed-Collection-Field (TDCF) experiments on working perovskite (MAPbI3-xClx) solar cells with different device architectures.
After excitation with a wavelength-tuneable nanosecond optical pulse the photogenerated charges are subsequently extracted by a voltage pulse with a minimal delay of 10ns. By varying the delay we can probe the temporal evolution of the photogenerated charges in the device and quantify recombination losses. Most important is here the dependence of the carrier dynamics on the optical pulse fluence and intensity of the applied background illumination.
From this results we can conclude on the predominant recombination mechanism in perovskite solar cells, e.g. bimolecular recombination.
We show results on mesoporous-TiO2/Perovskite/Spiro and planar PEDOT:PSS/Perovskite/PCBM devices, were we found significant differences in the carrier dynamics.
For the mesoporous TiO2 system we found exceptionally long carrier lifetimes on the order of 100µs. We are also planning to do these experiments on some more device architectures and alos at low temperatures.
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