Inverted CsPbI3 perovskite solar cells with all solution processed layers fabricated in high humidity

• Published in: Communications materials Vol. 6; no. 1; pp. 72 - 10
• Main Authors: Lee, Sangwon, Cho, Sujin, Jeong, Seok-Hyun, Lee, Wonkyu, Pyun, Dowon, Nam, Jiyeon, Hwang, Ji-Seong, Kim, Youngmin, Jang, Jihyun, Kang, Yoonmook, Kim, Donghwan, Lee, Hae-Seok
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 12.04.2025; Nature Publishing Group; Nature Portfolio
• Subjects: 639/301/299/946; 639/638/675; Annealing; Charge transport; Chemistry and Materials Science; Efficiency; Energy conversion efficiency; Humidity; Mass production; Materials Science; Maximum power tracking; Moisture resistance; Passivity; Perovskites; Photovoltaic cells; Relative humidity; Solar cells; Surface defects; Thermal stability; Vaporization
• ISSN: 2662-4443; 2662-4443
• DOI: 10.1038/s43246-025-00796-1

CsPbI 3 , an inorganic perovskite with an excellent bandgap and thermal stability, exhibits great potential for Si-perovskite tandem solar cells although it is highly sensitive to moisture. Here we address this by fabricating CsPbI 3 solar cells under high humidity, controlling annealing via the humidity-dependent volatilization of dimethylammonium iodide. Surface passivation with 1,8-diaminooctane (DAO) reduces Pb surface defects, which enhances charge transport and forms a hydrophobic, moisture-resistant film. The DAO-passivated CsPbI 3 solar cell achieves a power conversion efficiency of 17.7% and retains 92.3% of its initial efficiency after 1500 minutes of maximum power point tracking in 30% relative humidity without encapsulation, demonstrating improved humidity stability. All solution-processed layers were fabricated in ambient air, highlighting their potential for cost-effective mass production. CsPbI₃ perovskite solar cells have potential for tandem applications but are sensitive to moisture. Here, CsPbI₃ cells under high humidity were fabricated using dimethylammonium iodide volatilization for precise annealing and 1,8-diaminooctane passivation to enhance efficiency and stability, achieving 17.7% efficiency.