期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 8, 期 18, 页码 4402-4406出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b01985
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资金
- National Key R@D Program of China [2017YFA0204800]
- National Natural Science Foundation of China [21525315, 21533010]
- DICP [DMTO201601]
- Science Challenging Program [JCKY2016212A501]
Recently, two-dimensional organic inorganic perovskites have attracted increasing attention due to their unique photophysical properties and high stability. Here we report a lead-free, two-dimensional perovskite, (PEA)(2)GeI4 (PEA = C6H5(CH2)(2)NH3+). Structural characterization demonstrated that this 2D perovskite structure is formed with inorganic germanium iodide planes separated by organic PEAT layers. (PEA)2GeI4 has a direct band gap of 2.12 eV, in agreement with 2.17 eV obtained by density functional theory (DFT) calculations, implying that it is suitable for a tandem solar cell. (PEA)(2)GeI4 luminesces at room-temperature with a moderate lifetime, exhibiting good potential for photovoltaic applications. In addition, 2D (PEA)(2)GeI4 is more stable than 3D CH3NH3GeI3 in air, owing to the presence of a hydrophobic organic long chain. This work provides a direction for the development of 2D Ge-based perovskites with potential for photovoltaic applications.
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