2-Aminoethanethiol Hydroiodate Additives Induced Phase Stability Improvement of CsPbI3 Films for Use in Inorganic Perovskite Solar Cells

作者：Xihong Ding, Demeng Qian, Hui Wang, Qian Hu, Lin Zhu, Hui Chen, Tao Xu, Aohan Li, Wei Hong · 发表于：Langmuir · 年份：2025 · DOI：10.1021/acs.langmuir.5c00335 · 被引用次数：2 · 研究领域：Perovskite Materials and Applications、Chalcogenide Semiconductor Thin Films、Quantum Dots Synthesis And Properties

This study investigates the role of 2-aminoethanethiol hydroiodate (2-AET·HI) additives in enhancing the phase stability and photovoltaic performance of CsPbI 3 films for inorganic perovskite solar cells. The incorporation of 2-AET·HI into the precursor solution results in a more uniform and compact film morphology. X-ray diffraction (XRD) analysis reveals that the 2-AET·HI-treated CsPbI 3 films retain their black α-phase, even after 300 h at 25% RH and ∼25 °C, whereas the control samples show a rapid transition to the nonphotoactive δ-phase. This improvement in phase stability is reflected in the enhanced photovoltaic performance, with the 2-AET·HI-modified devices exhibiting a power conversion efficiency (PCE) of 16.7%, compared to 15.4% for the control devices. Furthermore, the 2-AET·HI-modified devices display superior long-term stability, retaining 83% of their initial PCE after 192 h in ambient conditions, in stark contrast to the unmodified devices, which degrade rapidly.