title: Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells.
abstract: 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.
authors.affiliation: Center for Energy Harvesting Materials and System, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.affiliation: Chemistry and Nanoscience Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States.
authors.forename: Mengjin
authors.initials: M
authors.lastname: Yang
authors.affiliation: Center for Energy Harvesting Materials and System, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Xiaojia
authors.initials: X
authors.lastname: Zheng
authors.affiliation: Center for Energy Harvesting Materials and System, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Congcong
authors.initials: C
authors.lastname: Wu
authors.affiliation: Chemical Engineering, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Wenle
authors.initials: W
authors.lastname: Li
authors.affiliation: Center for Energy Harvesting Materials and System, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Yongke
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.|Department of Chemistry, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia.
authors.forename: Juan
authors.initials: J
authors.lastname: Bisquert
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.
authors.forename: Germà
authors.initials: G
authors.lastname: Garcia-Belmonte
authors.affiliation: Chemistry and Nanoscience Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhu
authors.affiliation: Center for Energy Harvesting Materials and System, Virginia Tech , Blacksburg, Virginia 24061, United States.
authors.forename: Shashank
authors.initials: S
authors.lastname: Priya
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D004560:Electricity; D006801:Humans; D007477:Ions / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D007477:Ions; D010087:Oxides; C059910:perovskite; D014025:Titanium
keywords: J−V hysteresis; perovskite solar cells; photocurrent density−voltage; photovoltaics; power conversion efficiency