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Rajagopal, Adharsh
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article
Stabilized Wide Bandgap Perovskite Solar Cells by Tin Substitution
Abstract
Wide bandgap MAPb(I<sub>1-y</sub>Br<sub>y</sub>)<sub>3</sub> perovskites show promising potential for application in tandem solar cells. However, unstable photovoltaic performance caused by phase segregation has been observed under illumination when y is above 0.2. Herein, we successfully demonstrate stabilization of the I/Br phase by partially replacing Pb<sup>2+</sup> with Sn<sup>2+</sup> and verify this stabilization with X-ray diffractometry and transient absorption spectroscopy. The resulting MAPb<sub>0.75</sub>Sn<sub>0.25</sub>(I<sub>1-y</sub>Br<sub>y</sub>)<sub>3</sub> perovskite solar cells show stable photovoltaic performance under continuous illumination. Among these cells, the one based on MAPb<sub>0.75</sub>Sn<sub>0.25</sub>(I<sub>0.4</sub>Br<sub>0.6</sub>)<sub>3</sub> perovskite shows the highest efficiency of 12.59% with a bandgap of 1.73 eV, which make it a promising wide bandgap candidate for application in tandem solar cells. The engineering of internal bonding environment by partial Sn substitution is believed to be the main reason for making MAPb<sub>0.75</sub>Sn<sub>0.25</sub>(I<sub>1-y</sub>Br<sub>y</sub>)<sub>3</sub> perovskite less vulnerable to phase segregation during the photostriction under illumination. Therefore, this study establishes composition engineering of the metal site as a promising strategy to impart phase stability in hybrid perovskites under illumination.