研究目的
Investigating the efficiency and stability of perovskite-silicon tandem solar cells through anion-engineered wide-bandgap perovskites.
研究成果
The study successfully developed a stable perovskite solar cell with a wide band gap of ~1.7 eV, achieving a PCE of 20.7% and retaining over 80% of its initial efficiency after 1000 hours of continuous illumination. The anion engineering of PEA-based 2D additives was crucial for controlling the structural and electrical properties of the perovskite films. A monolithic two-terminal perovskite/Si tandem solar cell achieved a high PCE of 26.7%, demonstrating the potential of perovskite materials to exceed the Shockley-Queisser limit for single-junction devices.
研究不足
The study acknowledges the challenges in achieving high efficiency and stability in wide-bandgap perovskite solar cells, particularly the trade-offs between VOC, JSC, and FF due to the insulating nature of certain phases. The research also highlights the need for further optimization of the Si bottom cell to exceed 30% efficiency in tandem configurations.
1：Experimental Design and Method Selection:
The study focused on developing a stable perovskite solar cell with a wide band gap using anion engineering of PEA-based 2D additives. The methodology included the fabrication of perovskite solar cells and tandem devices, structural characterization, and electrical property measurements.
2：Sample Selection and Data Sources:
Perovskite films were prepared with different 2D additives, and their performance was evaluated. Data sources included SEM, TEM, XRD, TRMC, C-AFM, and J-V measurements.
3：List of Experimental Equipment and Materials:
Equipment included SEM, TEM, XRD, TRMC, C-AFM, and J-V measurement setups. Materials included FAI, MABr, PbI2, PbBr2, CsI, Pb(SCN)2, and PEA-based additives.
4：Experimental Procedures and Operational Workflow:
The workflow involved the preparation of perovskite films with different additives, device fabrication, structural and electrical characterization, and stability testing under continuous illumination.
5：Data Analysis Methods:
Data analysis included the interpretation of SEM, TEM, and XRD results, photoconductivity transients from TRMC, current mapping from C-AFM, and J-V curve analysis.
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