Cesium-Incorporated Triple Cation Perovskites Deliver Fully Reversible and Stable Nanoscale Voltage ResponseClick to copy article linkArticle link copied!
- Elizabeth M. TennysonElizabeth M. TennysonDepartment of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United StatesInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United StatesMore by Elizabeth M. Tennyson
- Bart RooseBart RooseCavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, United KingdomMore by Bart Roose
- Joseph L. GarrettJoseph L. GarrettInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United StatesDepartment of Physics, University of Maryland, College Park, Maryland 20742, United StatesMore by Joseph L. Garrett
- Chen GongChen GongDepartment of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United StatesInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United StatesMore by Chen Gong
- Jeremy N. MundayJeremy N. MundayInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United StatesDepartment of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, United StatesMore by Jeremy N. Munday
- Antonio AbateAntonio AbateHelmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489 Berlin, GermanyDepartment of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Fuorigrotta, Naples, ItalyMore by Antonio Abate
- Marina S. Leite*Marina S. Leite*E-mail: [email protected]Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United StatesInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United StatesMore by Marina S. Leite
Abstract
Perovskite solar cells that incorporate small concentrations of Cs in their A-site have shown increased lifetime and improved device performance. Yet, the development of fully stable devices operating near the theoretical limit requires understanding how Cs influences perovskites’ electrical properties at the nanoscale. Here, we determine how the chemical composition of three perovskites (MAPbBr3, MAPbI3, and Cs-mixed) affects their short- and long-term voltage stabilities, with <50 nm spatial resolution. We map an anomalous irreversible electrical signature on MAPbBr3 at the mesoscale, resulting in local Voc variations of ∼400 mV, and in entire grains with negative contribution to the Voc. These measurements prove the necessity of high spatial resolution mapping to elucidate the fundamental limitations of this emerging material. Conversely, we capture the fully reversible voltage response of Cs-mixed perovskites, composed by Cs0.06(MA0.17FA0.83)0.94Pb(I0.83Br0.17)3, demonstrating that the desired electrical output persists even at the nanoscale. The Cs-mixed material presents no spatial variation in Voc, as ion motion is restricted. Our results show that the nanoscale electrical behavior of the perovskites is intimately connected to their chemical composition and macroscopic response.
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