Presentation Information
[17p-M_124-3]Impact of PbI2 Precursor Film Deposition Rate on the Performance of Perovskite Solar Cells Fabricated via a Vacuum/Solution Hybrid Process
〇(PC)Abduhabir Mirza1, Calum McDonald1, Vladimir Svrcek1, Hitoshi Sai1, Hiroyuki Fujiwara2, Takurou N. Murakami1, Takuya Matsui1 (1.READ, AIST, 2.Gifu Univ.)
Keywords:
perovskite solar cell,evaporation
Commercializing single-junction and tandem perovskite solar cells (PSCs) requires not only scalable and reproducible fabrication routes but also deposition techniques that are sufficiently rapid and compatible with industrial manufacturing. While spin-coating is a commonly used and well-established method for fabricating lab-scale, high-efficiency PSCs, achieving large-area, uniform, and thickness-controlled deposition remains a persistent challenge.
In this study, we explore a hybrid deposition method in which an inorganic PbI2 precursor layer is first deposited by vacuum thermal evaporation, followed by a subsequent solution-based process using organic halide salts. In particular, we systematically examine the impact of varying the PbI2 deposition rate Rd over a wide range (0.03-2.84 nm/s) on the resulting material properties and photovoltaic performance, and we compare these outcomes with those obtained from the conventional two-step spin-coating approach. Our results indicate that Rd strongly influences the surface morphology of the PbI2 precursor films as well as the grain size and composition of the final perovskite layers. An optimal Rd of approximately 0.7-0.8 nm/s (corresponding to 6-7 min deposition time) produces large-grain perovskite films and yields a power conversion efficiency (PCE) exceeding 20 percent, surpassing that of the spin-coated reference device (19.1 percent). Notably, even when Rd is increased to 2-3 nm/s (approximately 2 min deposition), the devices still maintain a comparable PCE of 18.8 percent.
These findings demonstrate that the device performance remains stable even when the inorganic precursor is deposited quickly, and they highlight the strong promise of this hybrid deposition method for future industrial-scale PSC production.
In this study, we explore a hybrid deposition method in which an inorganic PbI2 precursor layer is first deposited by vacuum thermal evaporation, followed by a subsequent solution-based process using organic halide salts. In particular, we systematically examine the impact of varying the PbI2 deposition rate Rd over a wide range (0.03-2.84 nm/s) on the resulting material properties and photovoltaic performance, and we compare these outcomes with those obtained from the conventional two-step spin-coating approach. Our results indicate that Rd strongly influences the surface morphology of the PbI2 precursor films as well as the grain size and composition of the final perovskite layers. An optimal Rd of approximately 0.7-0.8 nm/s (corresponding to 6-7 min deposition time) produces large-grain perovskite films and yields a power conversion efficiency (PCE) exceeding 20 percent, surpassing that of the spin-coated reference device (19.1 percent). Notably, even when Rd is increased to 2-3 nm/s (approximately 2 min deposition), the devices still maintain a comparable PCE of 18.8 percent.
These findings demonstrate that the device performance remains stable even when the inorganic precursor is deposited quickly, and they highlight the strong promise of this hybrid deposition method for future industrial-scale PSC production.