Additive effect of bromides and chlorides on the performance of perovskite solar cells fabricated via sequential deposition
article
A two-step sequential deposition method has been applied to prepare the solar cells with two types ofperovskites Cs0.15FA0.85Pb(I0.95Cl0.05)3and Cs0.15FA0.85Pb(I0.95Br0.05)3. In order to obtain the perovskite layers,the different sources of bromine and chlorine atoms were used for synthesis. The performance and time stabilityof chloride-based photocells are worse in comparison to the bromide-based devices. It can be explained by theeffect of an accumulation of Cl atoms at the interfaces between the chloride-based perovskites and the layerof PCBM. Such a process causes an increasing of interface recombination. Also, the bulk density of states and,consequently, the bulk recombination of charge carriers seem to be higher for the perovskite layers obtainedwith chlorine atoms. The two-step technique applied to create the bromide perovskites less influences thephotocells performance as in the case of one-step deposition. We can explain this observation by an existenceof nucleation sites in the inorganic layer which improve the growth of a perovskite material.
TNO Identifier
959221
ISSN
03787753
Source
Journal of Power Sources, 513
Publisher
Elsevier
Article nr.
230528
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