Colloidal Quantum Dot Inks for Single-Step-Fabricated Field-Effect Transistors: The Importance of Postdeposition Ligand Removal
Balazs, Daniel M.
Dirin, Dmitry N.
Kooi, Bart J.
Kovalenko, Maksym V.
Loi, Maria A.
- Journal Article
Colloidal quantum dots are a class of solution-processed semiconductors with good prospects for photovoltaic and optoelectronic applications. Removal of the surfactant, so-called ligand exchange, is a crucial step in making the solid films conductive, but performing it in solid state introduces surface defects and cracks in the films. Hence, the formation of thick, device-grade films have only been possible through layer-by-layer processing, limiting the technological interest for quantum dot solids. Solution-phase ligand exchange before the deposition allows for the direct deposition of thick, homogeneous films suitable for device applications. In this work, fabrication of field-effect transistors in a single step is reported using blade-coating, an upscalable, industrially relevant technique. Most importantly, a postdeposition washing step results in device properties comparable to the best layer-by-layer processed devices, opening the way for large-scale fabrication and further interest from the research community Show more
Journal / seriesACS Applied Materials & Interfaces
Pages / Article No.
PublisherAmerican Chemical Society
Subjectcolloidal quantum dot; field-effect transistor; colloidal ink; solution-phase ligand exchange; blade-coating
Organisational unit03934 - Kovalenko, Maksym / Kovalenko, Maksym
03934 - Kovalenko, Maksym / Kovalenko, Maksym
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