A Bifunctional Carbazide Additive For Durable CsSnI 3 Perovskite Solar Cells

作者：Chenghao Duan, Feilin Zou, Qiaoyun Wen, Minchao Qin, Jiong Li, Chang Chen, Xinhui Lu, Liming Ding, Keyou Yan · 发表于：Advanced Materials · 年份：2023 · DOI：10.1002/adma.202300503 · 被引用次数：92 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Chalcogenide Semiconductor Thin Films

Abstract Inorganic CsSnI 3 with low toxicity and a narrow bandgap is a promising photovoltaic material. However, the performance of CsSnI 3 perovskite solar cells (PSCs) is much lower than that of Pb‐based and hybrid Sn‐based (e.g., CsPbX 3 and CH(NH 2 ) 2 SnX 3 ) PSCs, which may be attributed to its poor film‐forming property and the deep traps induced by Sn 4+ . Here, a bifunctional additive carbazide (CBZ) is adapted to deposit a pinhole‐free film and remove the deep traps via two‐step annealing. The lone electrons of the NH 2 and CO units in CBZ can coordinate with Sn 2+ to form a dense film with large grains during the phase transition at 80 °C. The decomposition of CBZ can reduce Sn 4+ to Sn 2+ during annealing at 150 °C to remove the deep traps. Compared with the control device (4.12%), the maximum efficiency of the CsSnI 3 :CBZ PSC reaches 11.21%, which is the highest efficiency of CsSnI 3 PSC reported to date. A certified efficiency of 10.90% is obtained by an independent photovoltaic testing laboratory. In addition, the unsealed CsSnI 3 :CBZ devices maintain initial efficiencies of ≈100%, 90%, and 80% under an inert atmosphere (60 days), standard maximum power point tracking (650 h at 65 °C), and ambient air (100 h), respectively.