title: Temperature-Dependent Polarization in Field-Effect Transport and Photovoltaic Measurements of Methylammonium Lead Iodide.
abstract: While recent improvements in the reported peak power conversion efficiency (PCE) of hybrid organic-inorganic perovskite solar cells have been truly astonishing, there are many fundamental questions about the electronic behavior of these materials. Here we have studied a set of electronic devices employing methylammonium lead iodide ((MA)PbI3) as the active material and conducted a series of temperature-dependent measurements. Field-effect transistor, capacitor, and photovoltaic cell measurements all reveal behavior consistent with substantial and strongly temperature-dependent polarization susceptibility in (MA)PbI3 at temporal and spatial scales that significantly impact functional behavior. The relative PCE of (MA)PbI3 photovoltaic cells is observed to reduce drastically with decreasing temperature, suggesting that such polarization effects could be a prerequisite for high-performance device operation.
authors.forename: John G
authors.initials: JG
authors.lastname: Labram
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Fabini
authors.forename: Erin E
authors.initials: EE
authors.lastname: Perry
authors.forename: Anna J
authors.initials: AJ
authors.lastname: Lehner
authors.forename: Hengbin
authors.initials: H
authors.lastname: Wang
authors.forename: Anne M
authors.initials: AM
authors.lastname: Glaudell
authors.forename: Guang
authors.initials: G
authors.lastname: Wu
authors.forename: Hayden
authors.initials: H
authors.lastname: Evans
authors.affiliation: Department of Chemistry, University of Texas El Paso , El Paso, Texas 79968, United States.
authors.forename: David
authors.initials: D
authors.lastname: Buck
authors.affiliation: Department of Chemistry, University of Texas El Paso , El Paso, Texas 79968, United States.
authors.forename: Robert
authors.initials: R
authors.lastname: Cotta
authors.affiliation: Department of Chemistry, University of Texas El Paso , El Paso, Texas 79968, United States.
authors.forename: Luis
authors.initials: L
authors.lastname: Echegoyen
authors.forename: Fred
authors.initials: F
authors.lastname: Wudl
authors.forename: Ram
authors.initials: R
authors.lastname: Seshadri
authors.forename: Michael L
authors.initials: ML
authors.lastname: Chabinyc
keywords: (MA)PbI3; hybrid halide perovskite; ionic motion; low-temperature; polarization; transistors