Electrochemical impedance analysis of perovskite-electrolyte interfaces.
The flat band potentials and carrier densities of spin coated and sprayed MAPbI3, FA0.85Cs0.15PbI3, and MAPbBr3perovskite films were determined using the Mott-Schottky relation. The films developed a space charge layer and exhibited p-type conduction with a carrier concentration of ∼1016cm-3for spin coated films. Electrochemical impedance spectra showed typical space charge impedance at frequencies >1 kHz, and an exceptional high capacitance at frequency <1 kHz owing to an ion diffusion component.
National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA. zhen.li@nrel.gov.
Zhen
http://orcid.org/0000-0003-1177-2818
Z
Li
Renewable and Sustainable Energy Institute, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0027, USA. candy.mercado@colorado.edu.
Candy C
CC
Mercado
National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA. zhen.li@nrel.gov.
Mengjin
M
Yang
National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA. zhen.li@nrel.gov.
Ethan
E
Palay
National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA. zhen.li@nrel.gov.
Kai
K
Zhu