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Updated: May 22, 2025

Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers
Published on: September 27, 2018
Phase Separation of Binary Triptycenes by an Iodine Interlayer Film on a Ag(111) Surface
Peizhen Liu1, Peichao Wang1, Zichan Zheng2
1School of Chemical Engineering and Technology, Haihe Laboratory of Sustainable Chemical Transformations, Tianjin Key Laboratory of Applied Catalysis and Engineering, Tianjin University, Tianjin 300350, China.
Abstract:
We report the self-assembly behaviors of two triptycenes (Trip-1 and Trip-2) on metal surfaces without and with an iodine passivation interlayer by combining scanning tunneling microscopy (STM) and density functional theory (DFT) studies. On the Ag(111) surface, Trip-1 molecules form islands through intermolecular aldehyde-aldehyde hydrogen bonding and π-π stacking of benzene rings. In contrast, Trip-2 molecules lie flat and dispersed on the surface. The introduction of Trip-2 molecules can break the ordered assembly of Trip-1. Trip-1 and Trip-2 molecules will be mixed in a disorderly manner. On the iodine-passivated Ag(111) surface, Trip-1 molecules form islands of long chains by intermolecular aldehyde-aldehyde hydrogen bonding. Trip-1 and Trip-2 molecules will automatically be separated, forming a self-assembled binary monolayer. These results show that the interface can adjust the mixture and separation of two structurally analogous triptycenes.
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