研究目的
Investigating the use of 4-aminoethyl pyridine (4-AEP) as a bifunctional spacer cation for the preparation of efficient and stable 2D Ruddlesden-Popper perovskite solar cells.
研究成果
The use of 4-AEP as a bifunctional spacer cation successfully retards the crystallization rate of 2D RP perovskites, leading to high-quality films with smooth morphology and efficient charge transport. The solar cells based on (4-AEP)2MAn?1PbnI3n+1 (n=5) achieve a PCE of 11.68% and maintain 95% of their original efficiency after 1000 hours of storage in ambient air, demonstrating superior performance and stability compared to those using PEA as the spacer cation.
研究不足
The study focuses on the use of 4-AEP as a spacer cation and its effect on the crystallization and performance of 2D RP perovskite solar cells. The comparison is limited to PEA as the alternative spacer cation. The long-term stability is tested under ambient conditions with a relative humidity of ~30%, but other environmental factors are not considered.
1：Experimental Design and Method Selection:
The study employs a one-step spin-coating method for the preparation of 2D RP perovskite films using 4-AEP as the spacer cation. The coordination interaction between 4-AEP and PbI2 is utilized to retard the crystallization rate of the perovskites.
2：Sample Selection and Data Sources:
The (4-AEP)2MAn?1PbnI3n+1 (n=1, 3, 4, 5) perovskite films are prepared and compared with those using phenylethylamine (PEA) as the spacer cation.
3：List of Experimental Equipment and Materials:
Instruments include X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectra (XPS), field-emission scanning electron microscopy (SEM), atomic force microscopy (AFM), and ultraviolet photoelectron spectroscopy (UPS). Materials include 4-AEPI, MAI, PbI2, and DMF solvent.
4：Experimental Procedures and Operational Workflow:
The perovskite films are spin-coated and then annealed at 100 oC for 15 min. The films are characterized before and after annealing to study the crystallization process.
5：Data Analysis Methods:
The performance of the solar cells is evaluated through current density-voltage (J-V) curves and incident photon-to-electron conversion efficiency (IPCE) spectra. The stability of the films and devices is also assessed.
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