Tailoring particle size of PbI2 towards efficient perovskite solar cells under ambient air conditions. Issue 35 (14th April 2023)

• Record Type: Journal Article
• Authors: Zeng, Qiang; Ma, Qingman; Li, Linhong; Zheng, Bolin; Pan, Yining; Zhao, Xiangyun; Xiao, Hanrui; Yan, Chang; Liu, Fangyang
• Is Part Of: Chemical communications. Volume 59:Issue 35(2023)
• Page Start: 5269
• Page End: 5272
• Publication Date: 2023-04-14
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d3cc00972f
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : Micrometer-sized PbI2 (P-PbI2 ) is beneficial for preparing higher-quality perovskite film and solar cells under low humidity conditions. Comparatively, millimeter-sized PbI2 crystals (C-PbI2 ) allow the growth of denser perovskite films under heavy humidity conditions. Abstract : PbI2 films as templates are essential to the quality of perovskite (PVK) film in a two-step sequential deposition process. Herein, we demonstrate that PbI2 microcrystal powder (P-PbI2 ) of micrometer size is beneficial for preparing higher-quality PbI2 films in contrast to millimeter-sized PbI2 crystals (C-PbI2 ) under low relative humidity (RH) conditions. Surprisingly, C-PbI2 allowed the growth of denser films than P-PbI2 under heavy RH conditions. Ultimately, P-PbI2 gave PVK solar cells (PSCs) a best power conversion efficiency (PCE) of 23.30% under a low RH of 30 ± 5%, and C-PbI2 derived an impressive PCE of 21.09% when fabricated under conditions with RH = 50 ± 5%. This work provides ideas for the selection of lead iodide for the fabrication of PSCs under air conditions.