Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Double cation perovskite solar cells with low hystheresis exhibit slow (hour-long) transient
response to bias and light step excitation, implying a significant role of ion transport on solar
performance - beyond standard I(V) characterization. By numerical modeling including ion
transport and interface recombination and energy alignments, we explore physical scenarios that
approach the measured transients. A combination of low hole recombination at the electron
transport layer (ETL) and low recombination of electrons at the hole transport layer (HTL),
together with higher majority carrier concentration at the ETL than at the HTL are key to
reproduce qualitatively the bias and open-circuit voltage step responses in Cs0.17FA0.83PbI2.2Br0.8
inverted, blade- and spin-coated solar cells. The observed increase of electroluminescence after
biasing is explained by a reduction in interface electronic potential barriers after ion motion,
promoting bulk radiative recombination.
Figure S1. Simulated energy band diagram and key parameters: interface minority carrier
recombination velocities vpE/vnH, conduction band energy ECE of the electron transport layer
(ETL), valence band energy EVH of the hole transport layer (HTL), yielding the differences to the
perovskite conduction and valence band EE and EH, respectively, as indicated in the poster.
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