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Chemical vapor deposited polymer layer for efficient passivation of planar perovskite solar cells

Malekshahi Byranvand, M.; Behboodi-Sadabad, F.; Alrhman Eliwi, A.; Trouillet, V.; Welle, A.; Ternes, S.; Hossain, I. M.; Khan, M. R.; Schwenzer, J. A.; Farooq, A.; Richards, B. S.; Lahann, J.; Paetzold, U. W.

Reducing non-radiative recombination losses by advanced passivation strategies is pivotal to maximize the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Previously, polymers such as poly(methyl methacrylate), poly(ethylene oxide), and polystyrene were successfully applied in solution-processed passivation layers. However, controlling the thickness and homogeneity of these ultra-thin passivation layers on top of polycrystalline perovskite thin films is a major challenge. In response to this challenge, this work reports on chemical vapor deposition (CVD) polymerization of poly(p-xylylene) (PPX) layers at controlled substrate temperatures (14–16 °C) for efficient surface passivation of perovskite thin films. Prototype double-cation PSCs using a ∼1 nm PPX passivation layer exhibit an increase in open-circuit voltage (V$_{OC}$) of ∼40 mV along with an enhanced fill factor (FF) compared to a non-passivated PSC. These improvements result in a substantially enhanced PCE of 20.4% compared to 19.4% for the non-passivated PSC. Moreover, the power output measurements over 30 days under ambient atmosphere (relative humidity ∼40–50%) confirm that the passivated PSCs are more resilient towards humidity-induced degradation. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125660
Veröffentlicht am 05.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Institut für Funktionelle Grenzflächen (IFG)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000125660
Erschienen in Journal of materials chemistry / A
Band 8
Heft 38
Seiten 20122-20132
Nachgewiesen in Scopus
Web of Science
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