研究目的
Investigating the formation of more ordered 2D tin-based perovskite crystals oriented vertically to improve the efficiency and stability of lead-free perovskite solar cells.
研究成果
The study demonstrates that the growth of 2D perovskite thin-film plays a key role in improving the performance of Sn- perovskite solar cells. The use of PEACl as an additive enables the formation of highly oriented, high n-member layered Ruddlesden-Popper 2D perovskite films, leading to Pb-free perovskite solar cells with a power conversion efficiency of 9.1%. This work provides new strategies towards highly efficient and stable Sn- perovskites.
研究不足
The study focuses on the use of PEACl as an additive to improve the crystal orientation and stability of Sn- perovskite films. However, the impact of other additives or conditions on the performance of lead-free perovskite solar cells was not explored.
1：Experimental Design and Method Selection:
The study involved the use of phenyl ethyl ammonium chloride (PEACl) as an additive to grow higher members of pure phase 2D crystals of Sn- perovskite with excellent vertical crystal orientation. In-situ synchrotron-based grazing incident X-ray diffraction (GIXRD) was used to evaluate the crystal growth orientation at different temperatures.
2：Sample Selection and Data Sources:
Tin (II) iodide (SnI2), tin (II) fluoride (SnF2), formamidinium iodide (FAI) and different amount of PEACl were dissolved in dimethyl sulfoxide (DMSO) to prepare the precursor solution. Sn- perovskite films were prepared by a one-step spin coating of the precursor solution using chlorobenzene as the antisolvent.
3：List of Experimental Equipment and Materials:
The study used PSCs with the structure FTO / PFDOT: PSS / Sn-perovskite / C60 / BCP / Ag. The morphology of the perovskite film was analyzed using SEM.
4：Experimental Procedures and Operational Workflow:
The films were annealed at different temperatures (70, 80, 90, and 100℃) to observe the changes in crystal orientation and film morphology.
5：Data Analysis Methods:
The changes in crystal orientation and film morphology were analyzed using in-situ synchrotron-based GIXRD and SEM. The photovoltaic performance of the devices was measured under AM 1.5G irradiation.
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