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Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl) imide Ion in Coevaporated p-i-n Perovskite Solar Cells

Klipfel, Nadja (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Kanda, Hiroyuki (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Sutanto, Albertus Adrian (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
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Mensi, Mounir (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Igci, Cansu (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Leifer, Klaus, 1965- (författare)
Uppsala universitet,Tillämpad materialvetenskap,Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Brooks, Keith (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Kinge, Sachin (författare)
Toyota Motor Co Ltd, Adv Technol Div, Toyota Motor Tech Ctr, B-1930 Zaventem, Belgium.
Roldan-Carmona, Cristina (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.;Univ Valencia, Inst Ciencia Mol ICMol, C-J Beltran 2, Paterna 46980, Spain.
Momblona, Cristina (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Dyson, Paul J. (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
Nazeeruddin, Mohammad Khaja (författare)
Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland.
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Ecole Polytech Fed Lausanne EPFL Valais Wallis, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, CH-1951 Sion, Switzerland Tillämpad materialvetenskap (creator_code:org_t)
2021-10-27
2021
Engelska.
Ingår i: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 13:44, s. 52450-52460
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Hybrid lead halide perovskites have reached comparable efficiencies to state-of-the-art silicon solar cell technologies. However, a remaining key challenge toward commercialization is the resolution of the perovskite device instability. In this work, we identify for the first time the mobile nature of bis-(trifluoromethanesulfonyl)imide (TFSI-), a typical anion extensively employed in p-type dopants for 2,2'7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'spirofluorene (spiro-OMeTAD). We demonstrate that TFSI- can migrate through the perovskite layer via the grain boundaries and accumulate at the perovskite/electrontransporting layer (ETL) interface. Our findings reveal that the migration of TFSI- enhances the device performance and stability, resulting in highly stable p-i-n cells that retain 90% of their initial performance after 1600 h of continuous testing. Our systematic study, which targeted the effect of the nature of the dopant and its concentration, also shows that TFSI- acts as a dynamic defect-healing agent, which self-passivates the perovskite crystal defects during the migration process and thereby decreases nonradiative recombination pathways.

Ämnesord

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Nyckelord

perovskites
spiro-OMeTAD
dopant
migration
thermal evaporation
surface passivation

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