Hyun, Hochan Kim, Jihyun Jeong, Yujin Lee, Hanseul Jo, William Kim, Gee Yeong 2025-06-05T00:30:21Z 2025-06-05T00:30:21Z 2025-06-04 2025-06 1944-8244 https://pubs.kist.re.kr/handle/201004/152552 Perovskite precursor purity plays a crucial role in determining the characteristics and stability of perovskite solar cells (PSCs). This study systematically investigates the influence of precursor impurity levels on the material properties and device performance. High-purity precursors enhance grain growth and suppress the intermediate phase formation. Thermogravimetric analysis (TGA) confirms that low-impurity precursors exhibit an enhanced thermal stability. Electrical and optical characterizations reveal that reduced impurity content suppresses current-voltage hysteresis and nonradiative recombination. Sodium (Na) is identified as a dominant impurity, and its reduction enhances the thermal stability. Devices fabricated with low-impurity precursors achieved a power conversion efficiency of 20.15% and maintained 96.7% of their initial efficiency after two months of ambient exposure, whereas higher-impurity devices experienced significant degradation. This study establishes precursor purity as a key determinant of PSC efficiency and stability, offering insights into the advancement of stable and efficient photovoltaic devices. English American Chemical Society Unveiling the Importance of Lead Halide Perovskite Precursor Purity and Its Impact on Stability Article 10.1021/acsami.5c05965 1 ACS Applied Materials & Interfaces, v.17, no.22, pp.32521 - 32529 ACS Applied Materials & Interfaces 17 22 32521 32529 N scie scopus 001494639500001 2-s2.0-105005870494 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article TEMPERATURE IMPURITIES STABILIZATION DEGRADATION DIFFUSION impurityengineering precursor purity charge carrier transport perovskite solar cell device stability