Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Organic−inorganic perovskite is a promising class of materials for photovoltaic applications and light emitting diodes. However, so far commercialization is still impeded by several drawbacks. Atomic-scale effects have been suggested to be possible causes and thus an experimental view at the atomic level is desirable. Here, we present a low-temperature scanning tunneling microscopy (STM) study of single crystal perovskite as well as ultra-thin films of methylammonium lead bromide CH3NH3PbBr3 on Au(111). Topographic images of the in situ cleaved perovskite surface reveal the real-space atomic structure. Careful comparison between the experimental STM images and density functional theory (DFT) calculations suggest that the surfaces are the reconstructed (010) CH3NH3Br terminated surfaces. We were also able to visualize the defects in real space at the atomic level. [1]
Reference: [1] R. Ohmann, L. K. Ono, H.-S. Kim, H. Lin, M. V. Lee, Y. Li*, N.-G. Park*, and Y. B. Qi*, J. Am. Chem. Soc. 2015, 137, 16049
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