講演情報
[16p-M_124-13]All-SAM Interfacial Design in Monolithic All-Perovskite Tandem Solar Cells
〇(P)Safalmani Pradhan1, Qing Shen1, Shuzi Hayase1 (1.UEC-Tokyo)
キーワード：
Mixed halide perovskites、All SAM Tandem Solar Cells
All-perovskite tandem solar cells (APTSCs) offer a promising route to exceed the efficiency limits of single-junction devices; however, interfacial losses and stability issues remain critical challenges. Here, we report a two-terminal APTSC employing self-assembled monolayers (SAMs) as hole-selective interfaces in both wide-bandgap (1.77 eV) and narrow-bandgap (1.25 eV Sn–Pb) subcells. MeO-2PACz is used in the top cell, while a carbazole-free ethylenediamine tetra(methylenephosphonic acid) (EDTMP) is introduced in the bottom cell as a PEDOT:PSS alternative. Tandem devices with PEDOT:PSS show higher power conversion efficiency due to improved fill factor and lower series resistance, whereas EDTMP-based devices exhibit reduced efficiency arising from non-optimized interfacial energetics and increased recombination at this preliminary stage. Nevertheless, EDTMP offers superior chemical robustness, lower acidity, and eliminates hygroscopic dopants associated with PEDOT:PSS. These results highlight the potential of EDTMP and provide a clear pathway toward PEDOT:PSS-free APTSCs through further molecular and interfacial optimization.