研究目的
Investigating the nature of conduction and charge carrier dynamics of mixed organic-inorganic cations along with mixed halides perovskite material synthesized in different solvents to improve charge carrier transport through solvent engineering.
研究成果
The study concludes that triple cation perovskites in DMF/DMSO solvent exhibit higher diffusion lengths and carrier mobilities compared to those prepared in GBL solvent, attributed to the better film quality and morphology achieved with DMF/DMSO.
研究不足
The study is limited to the comparison of only two solvents (DMF/DMSO and GBL) for the preparation of mixed cation perovskite films. The environmental and health hazards of DMF solvent were noted, which may limit its use in large-scale production.
1：Experimental Design and Method Selection:
Optical pump terahertz probe (OPTP) spectroscopy was used to investigate the charge carrier dynamics. The perovskite thin films were photoexcited using a 400 nm pump beam, and the dynamics of the excited charge carriers were probed by the terahertz pulse.
2：Sample Selection and Data Sources:
Mixed cation perovskite films were prepared using two different solvents (DMF/DMSO and GBL) by the spin coating method.
3：List of Experimental Equipment and Materials:
Nonlinear ZnTe crystal based OPTP spectroscopic system, perovskite thin films, solvents (DMF/DMSO and GBL).
4：Experimental Procedures and Operational Workflow:
The perovskite films were excited with a 400 nm pump beam, and the change in THz transmission was monitored to investigate the photoconductivity.
5：Data Analysis Methods:
The peak photoconductivity was calculated to estimate initial mobilities, and the decay in THz transients was analyzed to understand charge carrier recombination.
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