Camphorsulfonic-Salified Chitosan Allowing MACl-Free Stabilization of Pure FAPbI3 α-Phase via Gravure Printing in Ambient Air

N. Vanni, A. Giuri, M. Calora, E. Podda, A. P. Caricato, Katia SPARNACCI, R. Suhonen, M. Ylikunnari, A. Covarelli, L. Gregori, Angelis F. De, G. Marra, P. Biagini, R. Po, A. Rizzo

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

Metal–halide perovskites have gained extreme interest in the photovoltaic field with formamidinium lead iodide (FAPbI3) currently being one of the best-performing materials for single-junction solar cells. Despite the outstanding record efficiencies, there are still several major issues hindering the large-scale fabrication of perovskite solar cells. The vulnerability to environmental agents along with the need of controlled atmosphere and crystallization aids for the perovskite film deposition represents the major roadblocks. This is particularly true for FAPbI3 for which the thermodynamically stable phase at room temperature is photovoltaically inactive δ-phase. To address those challenges, herein, a camphorsulfonic-salified chitosan is specifically designed with the aid of DTF calculations to strongly interact with the perovskite and, as a result, improve the morphology and optoelectronic quality of the FAPbI3. Thanks to the numerous interactions and then the modulation of the solution viscosity, FAPbI3 devices are fabricated by gravure printing deposition without either antisolvent bath or inclusion of methylammonium chloride (MACl) as additive. The gravure-printed devices with the chitosan feature an enhanced efficiency and stability in air, retaining 80% of the original efficiency after 1200 h in ambient air without any encapsulation.
Lingua originaleInglese
RivistaSolar RRL
Volume8
Numero di pubblicazione22
DOI
Stato di pubblicazionePubblicato - 2024

Keywords

  • ambient air deposition
  • FAPbI
  • 3
  • formamidinium lead iodide
  • gravure printing deposition
  • perovskite solar cells
  • polymeric additives

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