講演情報
[17p-K405-6]Effect of Alkali metal halide additive on AgBiI4 lead-free solar cell
〇Shanas Fatima1,2, Sunil Kumar Singh1, Khadka B Dhruba2, Yasuhiro Shirai2 (1.Dept. of Phy. IIT BHU, 2.NIMS, Tsukuba, Japan)
キーワード：
lead free solar cell、additive engineering
Halide perovskites have achieved high power conversion efficiencies (PCEs) exceeding 26% for single-junction devices. However, their use is limited by lead toxicity and poor stability against moisture, air, and temperature. To address these issues, ternary Ag-Bi-I materials (rudorffites) have emerged as Pb-free alternatives, offering lower toxicity and better stability. Despite their promise, the PCE of rudorffite-based solar cells remains low. In this study, we investigate the effect of NaI additives on AgBiI4, a Pb-free material with a bandgap of ∼1.84 eV. The NaI additive improves crystallization, resulting in compact, pinhole-free films. Devices with an ITO/SnO2/AgBiI4-NaI/PTAA/Ag configuration achieved a PCE of 3.72%, among the best for rudorffite solar cells (Fig. 1). NaI also reduced Bi0 ions, suppressed non-radiative relaxations (evidenced by increased PL intensity and lifetime), and improved device stability. This work highlights the role of additive engineering in enhancing rudorffite solar cell performance.