10.1021/acs.jpclett.5b02273.s001
Hui-Seon Kim
Hui-Seon
Kim
In-Hyuk Jang
In-Hyuk
Jang
Namyoung Ahn
Namyoung
Ahn
Mansoo Choi
Mansoo
Choi
Antonio Guerrero
Antonio
Guerrero
Juan Bisquert
Juan
Bisquert
Nam-Gyu Park
Nam-Gyu
Park
Control of <i>I</i>–<i>V</i> Hysteresis
in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Perovskite
Solar Cell
American Chemical Society
2015
ion migration
PCBM
CH 3NH Perovskite Solar CellMismatch
hysteresi
capacitance
MAPbI 3
Substantial reduction
PEDOT
CH 3NH perovskite
scan direction
TiO 2
TiO 2 layer
cell configurations
2015-12-17 10:46:40
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Control_of_i_I_i_i_V_i_Hysteresis_in_CH_sub_3_sub_NH_sub_3_sub_PbI_sub_3_sub_Perovskite_Solar_Cell/2005404
Mismatch
of current (<i>I</i>)-voltage (<i>V</i>) curves
with respect to the scan direction, so-called <i>I</i>–<i>V</i> hysteresis, raises critical issue in MAPbI<sub>3</sub> (MA = CH<sub>3</sub>NH<sub>3</sub>) perovskite solar cell.
Although ferroelectric and ion migration have been proposed as a basis
for the hysteresis, origin of hysteresis has not been apparently unraveled. We report here on the origin of <i>I</i>–<i>V</i> hysteresis of perovskite solar cell that was systematically
evaluated by the interface-dependent electrode polarizations. Frequency
(<i>f</i>)-dependent capacitance (C) revealed that the normal
planar structure with the TiO<sub>2</sub>/MAPbI<sub>3</sub>/spiro-MeOTAD
configuration showed most significant <i>I</i>–<i>V</i> hysteresis along with highest capacitance (10<sup>–2</sup> F/cm<sup>2</sup>) among the studied cell configurations. Substantial
reduction in capacitance to 10<sup>–3</sup> F/cm<sup>2</sup> was observed upon replacing TiO<sub>2</sub> with PCBM, indicative
of the TiO<sub>2</sub> layer being mainly responsible for the hysteresis.
The capacitance was intensively reduced to 10<sup>–5</sup> F/cm<sup>2</sup> and <i>C</i>–<i>f</i> feature
shifted to higher frequency for the hysteresis-free planar structures
with combination of PEDOT:PSS, NiO, and PCBM, which underlines the
spiro-MeOTAD in part contributes to the hysteresis. This work is expected
to provide a key to the solution of the problem on <i>I</i>–<i>V</i> hysteresis in perovskite solar cell.