Journal
ISCIENCE
Volume 24, Issue 2, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2020.102024
Keywords
-
Categories
Funding
- European Union H2020 Programme under the European Research Council Consolidator grant [MOLEMAT] [726360]
Ask authors/readers for more resources
The study uncovered the mechanistic behavior of negative capacitance in perovskite solar cells by analyzing impedance spectra, C-f spectra, and J-V characteristics, revealing that the appearance of negative capacitance in p-i-n type PSCs is primarily associated with the migration of halide ions and vacancies.
We have unlocked the mechanistic behavior of negative capacitance in perovskite solar cells (PSCs) by analyzing impedance spectra at variable photovoltage and applied bias, temperature-dependent capacitance versus frequency (C-f) spectra, and current-voltage (J-V) characteristics. We noted that p-i-n type PSCs having PEDOT:PSS or PTAA as hole transport layer display negative capacitance feature at low and intermediate frequencies. The activation energies (Ea) for the observance of negative capacitance were found to be in a similar order of magnitude required for the ionic migration. Moreover, the kinetic relaxation time (tau(kin)) estimated to be in the same order of magnitude required to activate the halide ion migration. Our investigation suggests that the primary reason for the appearance of negative capacitance in PSCs with a p-i-n configuration is associated with the migration of halide ions and vacancies in the perovskite layers.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available