TY - JOUR
T1 - Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells
AU - Chen, Bo
AU - Yang, Mengjin
AU - Zheng, Xiaojia
AU - Wu, Congcong
AU - Li, Wenle
AU - Yan, Yongke
AU - Bisquert, Juan
AU - Garcia-Belmonte, Germà
AU - Zhu, Kai
AU - Priya, Shashank
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/12/3
Y1 - 2015/12/3
N2 - In the past five years, perovskite solar cells (PSCs) based on organometal halide perovskite have exhibited extraordinary photovoltaic (PV) performance. However, the PV measurements of PSCs have been widely recognized to depend on voltage scanning condition (hysteretic current density-voltage [J-V] behavior), as well as on voltage treatment history. In this study, we find that varied PSC responses are attributable to two causes. First, capacitive effect associated with electrode polarization provides a slow transient non-steady-state photocurrent that modifies the J-V response. Second, modification of interfacial barriers induced by ion migration can modulate charge-collection efficiency so that it causes a pseudo-steady-state photocurrent, which changes according to previous voltage conditioning. Both phenomena are strongly influenced by ions accumulating at outer interfaces, but their electrical and PV effects are different. The time scale for decay of capacitive current is on the order of seconds, whereas the slow redistribution of mobile ions requires several minutes.
AB - In the past five years, perovskite solar cells (PSCs) based on organometal halide perovskite have exhibited extraordinary photovoltaic (PV) performance. However, the PV measurements of PSCs have been widely recognized to depend on voltage scanning condition (hysteretic current density-voltage [J-V] behavior), as well as on voltage treatment history. In this study, we find that varied PSC responses are attributable to two causes. First, capacitive effect associated with electrode polarization provides a slow transient non-steady-state photocurrent that modifies the J-V response. Second, modification of interfacial barriers induced by ion migration can modulate charge-collection efficiency so that it causes a pseudo-steady-state photocurrent, which changes according to previous voltage conditioning. Both phenomena are strongly influenced by ions accumulating at outer interfaces, but their electrical and PV effects are different. The time scale for decay of capacitive current is on the order of seconds, whereas the slow redistribution of mobile ions requires several minutes.
KW - JV hysteresis
KW - perovskite solar cells
KW - photocurrent density'voltage
KW - photovoltaics
KW - power conversion efficiency
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U2 - 10.1021/acs.jpclett.5b02229
DO - 10.1021/acs.jpclett.5b02229
M3 - Article
C2 - 26550850
AN - SCOPUS:84948985263
SN - 1948-7185
VL - 6
SP - 4693
EP - 4700
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 23
ER -