期刊
NANO ENERGY
卷 73, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104820
关键词
Cryo-HRTEM method; Organic-inorganic hybrid perovskites; CH3NH3PbI3; Surface structure; Planar defects; First-principles calculations
类别
资金
- National Natural Science Foundation of China [21802065, 11774142]
- Leading talents of Guangdong province program [2016LJ06N507]
- Shenzhen DRC project [[2018] 1433]
- Shenzhen Basic Research Fund [JCYJ20170817 110652558, JCYJ20170817105201098, JCYJ20170817105132549, JCYJ20190809181601639, JCYJ20180504165817769]
- Presidential Fund
- Development and Reform Commission of Shenzhen Municipality
The performance of halide perovskite solar cells is often dominated by structural defects. However, atomic scale characterization of the crystalline defects in organic-inorganic hybrid perovskites is hindered by the electron-beam sensitivity of the organic components in the structure. Here we reported the atomic scale characterization of CH3NH3PbI3 (MAPbI(3)) single crystal using the state-of-the-art cryo-transmission electron microscopy. We confirm that the MAPbI(3) structure is intact during high resolution cryo-TEM analysis by probing the content of carbon, nitrogen from the [CH3NH3]+ component using electron energy loss spectroscopy. Atomic steps of {200}(T) surfaces were observed which shed light on the crystal growth details and low-energy surfaces. Surprisingly, high density of stacking faults are observed in the hybrid perovskite materials. We believe these fault structures serves the role of micro-interface between otherwise perfect lattices which facilitates charge separation and reduces the photon-generated carrier recombination within the crystal solids. First-principles calculations show that the presence of such stacking faults significantly changes the electronic structures of the materials, which may play a critical role in further optimizing the properties such as charge-carrier mobility, the carrier diffusion length and energy conversion efficiency of organic-inorganic hybrid perovskite-based energy harvesting devices.
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