Publication date: 2nd November 2020
Perovskite solar cells have reached power conversion efficiency (PCE) of 25.5%, which is comparable with traditional silicon technology However, despite the success in achieving high PCE, the main obstacles to the commercialization of perovskite technologies remain to improve stability.
At present, the most promising compositions with high stability are FA / Cs-based double-cation perovskites. Doping of perovskite with chlorine anions has been widely reported in the literature for the example of single-cation MAPbI3 [1-2]. A small amount of chlorine makes it possible to eliminate lattice stresses and to shift the density of electrons and holes far from the centers of the traps [3]. However, the topic of the influence of chlorine on the physical processes occurring in films, the stability and output characteristics of solar cells based on double-cation perovskite still needs to be studied in detail.
In this work we demonstrate the results of studying inverted perovskite solar cells based on double-cation perovskite FA0.8Cs0.2PbI3. Doping of perovskite with chlorine anions makes it possible to increase the efficiency of solar cells from 14.7% up to 16.36%. Film microscopy showed that the addition of chlorine increased the perovskite grain size and crystallinity. The photoluminescence intensity of the films increases without shifts in the absorption spectra of the samples and the photoluminescence peak. This indicates that chlorine has no effect on the band gap of the perovskite but suppresses recombination at defects. Due to this, Voc increases from 0.96-0.98 to 0.98-1.03 V. Jsc also increases from 17.8-19.1 mA/cm2 to 19.0-20.3 mA/cm2. The MPPT test was carried out for encapsulated devices in ambient under LED-lamp with intensity of 100 mW/cm2. The undoped perovskite device retained 80% of its original efficiency over 590 hours. The chlorine-doped sample maintained efficiency above 80% for over 1100 hours.
Authors gratefully acknowledges the financial support from the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (No K2-2019-13).
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