研究目的
Investigating the relationship between lattice strain and δ-phase suppression in all-inorganic CsPbI2Br perovskite solar cells.
研究成果
The study revealed that the degree of lattice strain is responsible for the suppression of the δ phase growth in all-inorganic CsPbI2Br perovskite solar cells. By controlling the strain during the growth of the perovskite film, the appearance of the non-perovskite phase was completely inhibited, improving the ordered crystal growth inside the film and achieving a perovskite film with a vertical plane growth. This finding provides insights on the inorganic perovskite crystal growth and has significant benefit for high performing all-inorganic PSCs.
研究不足
The study focuses on CsPbI2Br perovskite films and may not be directly applicable to other perovskite compositions. The in situ GIWAXS technique requires specialized equipment and may not be readily available in all research settings.
1：Experimental Design and Method Selection:
Employed in situ Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) technique to examine the time-resolved structural transformation of all-inorganic CsPbI2Br perovskite film under different processing temperatures.
2：Sample Selection and Data Sources:
Prepared CsPbI2Br perovskite films under different processing temperatures (RT, 45 ℃, 50 ℃, 55 ℃, 60 ℃).
3：List of Experimental Equipment and Materials:
Used a sealed box with Kapton windows for incoming X-ray and diffracted X-ray, which can be continuously heated and filled with N2 for sample annealing and observation.
4：Experimental Procedures and Operational Workflow:
The sample was irradiated by X-rays at an incidence angle of
5：40 °. A two-dimensional XRD pattern was obtained by MarCCD at an exposure time of 1 s at a distance of about 310 mm from the sample. Data Analysis Methods:
The XRD pattern was analyzed using FIT2D software and displayed in the scattering vector q coordinates.
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