Presentation Information
[9p-P06-12]B-Site Alloying with Tin for Enhanced Phase Stability in Wide Band Gap Perovskites
〇(P)Safalmani Pradhan1, Qing Shen1, Shuzi Hayase1 (1.UEC-Tokyo)
Keywords:
Mixed halide perovskites,Wide band gap perovskites,phase segregation
Wide-bandgap (WBG) perovskites are vital for all-perovskite tandem solar cells but suffer from light-induced phase segregation, leading to trap formation and reduced performance. This arises from halide immiscibility, lattice strain, and ion migration. Partial substitution of Pb with Sn has emerged as a promising strategy to suppress segregation by relieving lattice strain and stabilizing halide distribution. Photoluminescence studies under illumination show that MAPbI1.5Br1.5 undergoes a redshift in PL peak, indicating segregation. In contrast, Sn-containing compositions like MASn0.75Pb0.25I1.5Br1.5 show minimal PL shifts, confirming improved phase stability. These results highlight Sn substitution as an effective route to enhance photostability in WBG perovskites, enabling stable and efficient tandem devices.