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Self‐Assembled Hole Transporting Monolayer for Highly Efficient Perovskite Solar Cells
Author(s) -
Magomedov Artiom,
AlAshouri Amran,
Kasparavičius Ernestas,
Strazdaite Simona,
Niaura Gediminas,
Jošt Marko,
Malinauskas Tadas,
Albrecht Steve,
Getautis Vytautas
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201801892
Subject(s) - materials science , perovskite (structure) , passivation , monolayer , nucleation , substrate (aquarium) , self assembled monolayer , dopant , x ray photoelectron spectroscopy , energy conversion efficiency , indium tin oxide , indium , chemical engineering , optoelectronics , nanotechnology , doping , thin film , organic chemistry , layer (electronics) , chemistry , oceanography , geology , engineering
The unprecedented emergence of perovskite‐based solar cells (PSCs) has been accompanied by an intensive search of suitable materials for charge‐selective contacts. For the first time a hole‐transporting self‐assembled monolayer (SAM) as the dopant‐free hole‐selective contact in p–i–n PSCs is used and a power conversion efficiency of up to 17.8% with average fill factor close to 80% and undetectable parasitic absorption is demonstrated. SAM formation is achieved by simply immersing the substrate into a solution of a novel molecule V1036 that binds to the indium tin oxide surface due to its phosphonic anchoring group. The SAM and its modifications are further characterized by Fourier‐transform infrared and vibrational sum‐frequency generation spectroscopy. In addition, photoelectron spectroscopy in air is used for measuring the ionization potential of the studied SAMs. This novel approach is also suitable for achieving a conformal coverage of large‐area and/or textured substrates with minimal material consumption and can potentially be extended to serve as a model system for substrate‐based perovskite nucleation and passivation control. Further gains in efficiency can be expected upon SAM optimization by means of molecular and compositional engineering.