講演情報
[15p-K405-11]Hole-Selective Molecule Anchoring on Halide Perovskite Surface for n-i-p Solar Cells
〇Zhanglin Guo1, Tianhao Wu1, Telugu Bhim Raju1, Toshinori Matsushima1, Shintaro Ida1,2 (1.Kyushu Univ., 2.Kumamoto Univ.)
キーワード：
perovskite surface anchoring、hole-selective contact、lattice matching
Self-assembled molecules (SAMs) are becoming popular in the development of efficient perovskite solar cells (PSCs). Typically, SAMs anchor to the metal oxides to tune the energy level alignment, enhance hole extraction, and passivate defects at the perovskite interface in p-i-n PSCs. However, the lattice mismatching with perovskite and the molecule geometry of SAMs only results in weak interaction and poor passivation effects. This report introduces a novel hole-selective SAM featuring a terephthalic methylammonium core structure, which offers double-site anchoring ability and a lattice-matched diameter (6.36 Å) with formamidinium lead iodide (FAPbI3) perovskite (6.33 Å). When deposited on the perovskite top surface in an n-i-p structure, characterizations including DFT and AFM-IR reveal that a well-ordered and fully covered SAM layer forms. This SAM, with its ionic-based anchoring groups, demonstrates significantly high adsorption energy on both organic halide-terminated and lead halide-terminated surfaces compared to commonly used acid or ester anchoring groups. These properties synergistically enhance carrier extraction and defect passivation. As a result, the photon conversion efficiency of the PSCs increased from 21.7% to 24.2%. Moreover, the SAM also markedly improved the long-term stability of the PSCs, particularly under elevated temperatures (85 °C).