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Research Highlight

Revealing Environment Impacts on Organometal Halide Perovskites (OMHPs) Charge Transport

Scientific Achievement

The impact of environment on charge transport in OMHP devices was identified. Combined macroscopic and local probe measurements revealed perovskite crystal to be highly sensitivity to the environment and electrodes.

Significance and Impact

A full understanding how the environment impacts transport in OMHPs is necessary to improve stability for applications including energy storage devices and gas sensors.

Research Details

– Environmental and interface effects in MAPbBr3 single crystals devices were investigated using impedance spectroscopy and G-Mode Kelvin Probe Force Microscopy (G-KPFM).
– Results indicate that the environment is a non-trivial component in the operation of OMHP devices, playing an important role in the charge transport behavior at the electrode/crystal interface of OMHPs due to coupling between surface mediated redox processes and bulk ionic species.
 
M. Ahmadi, E. S.  Muckley, I.  Ivanov, M. Lorenz, X. Li, O. Ovchinnikova, E. Lukosi, J. Tisdale, E. Blount, I. Kravchenko, S. Kalinin, B. Hu, L. Collins, "Environmental Gating and Galvanic Effects in Single Crystals of Organic-Inorganic halide Perovskites,"  ACS Appl. Mater. Interfaces 11 (16), 14722 (2019).  DOI: 10.1021/acsami.8b21112