title: Inductive Loop in the Impedance Response of Perovskite Solar Cells Explained by Surface Polarization Model.
abstract: The analysis of perovskite solar cells by impedance spectroscopy has provided a rich variety of behaviors that demand adequate interpretation. Two main features have been reported: First, different impedance spectral arcs vary in combination; second, inductive loops and negative capacitance characteristics appear as an intrinsic property of the current configuration of perovskite solar cells. Here we adopt a previously developed surface polarization model based on the assumption of large electric and ionic charge accumulation at the external contact interface. Just from the equations of the model, the impedance spectroscopy response is calculated and explains the mentioned general features. The inductance element in the equivalent circuit is the result of the delay of the surface voltage and depends on the kinetic relaxation time. The model is therefore able to quantitatively describe exotic features of the perovskite solar cell and provides insight into the operation mechanisms of the device.
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.|Nano-photonics and Optoelectronics Research Laboratory (NORLab), Shahid Rajaee Teacher Training University , 16788-15811 Lavizan, Tehran, Iran.
authors.forename: Elnaz
authors.initials: E
authors.lastname: Ghahremanirad
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.
authors.forename: Agustín
authors.identifier: http://orcid.org/0000-0002-7535-5063
authors.initials: A
authors.lastname: Bou
authors.affiliation: Nano-photonics and Optoelectronics Research Laboratory (NORLab), Shahid Rajaee Teacher Training University , 16788-15811 Lavizan, Tehran, Iran.
authors.forename: Saeed
authors.identifier: http://orcid.org/0000-0002-6154-7646
authors.initials: S
authors.lastname: Olyaee
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.|Department of Chemistry, Faculty of Science, King Abdulaziz University , Jeddah, Saudi Arabia.
authors.forename: Juan
authors.identifier: http://orcid.org/0000-0003-4987-4887
authors.initials: J
authors.lastname: Bisquert