研究目的
To address the phase instability of cesium lead halide perovskite by developing a 2D-3D all-inorganic Cs2PbI2Cl2-CsPbI2.5Br0.5 perovskite solar cell with enhanced efficiency and stability.
研究成果
The introduction of 2D Cs2PbI2Cl2 into 3D CsPbI2.5Br0.5 perovskite significantly improved the film morphology, crystal quality, and device performance. The 2D-3D heterojunction facilitated carrier transport and suppressed non-radiative recombination, leading to enhanced efficiency and stability of the solar cells.
研究不足
The study focuses on the stability and efficiency of Cs2PbI2Cl2-CsPbI2.5Br0.5 perovskite solar cells but does not explore the scalability of the fabrication process or the long-term stability under outdoor conditions. The performance of devices with areas larger than 2 cm2 was not investigated.
1：Experimental Design and Method Selection:
The study involved the fabrication of 2D-3D all-inorganic Cs2PbI2Cl2-CsPbI
2：5Br5 perovskite films by controlling CsCl to PbI2 ratios in the precursor solutions and crystal growth conditions at high temperatures. Sample Selection and Data Sources:
Films were prepared with varying CsCl concentrations (x = 0,
3：1, 15, 2, 3, and 4 M) and characterized using XRD, SEM, EBSD, HRTEM, UV-Vis, PL, TRPL, SCLC, and KPFM techniques. List of Experimental Equipment and Materials:
Instruments included XRD for structural analysis, SEM and HRTEM for morphology, EBSD for crystal orientation, UV-Vis for optical properties, PL and TRPL for recombination dynamics, SCLC for trap density, and KPFM for surface potential.
4：Experimental Procedures and Operational Workflow:
Precursor solutions were spun-coated onto preheated substrates and annealed at 325°C. Films were characterized for structural, morphological, and optoelectronic properties.
5：Data Analysis Methods:
Data were analyzed to determine crystal structure, orientation, optical properties, recombination dynamics, trap density, and surface potential.
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