A p-type PbS quantum dot ink with improved stability for solution processable optoelectronics. Issue 65 (25th July 2021)

• Record Type: Journal Article
• Authors: Ahmed, Fiaz; Dunlap, John H.; Pellechia, Perry J.; Greytak, Andrew B.
• Is Part Of: Chemical communications. Volume 57:Issue 65(2021)
• Page Start: 8091
• Page End: 8094
• Publication Date: 2021-07-25
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d1cc03014k
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : Benzylamine is an effective solvent for a stable, thiol-capped PbS QD ink. Diffusion-ordered NMR demonstrates 3-mercaptopropionic acid binding to the QD surface. Abstract : A highly stable p-type PbS-QDs ink is prepared using a single-step biphasic ligand exchange route, overcoming instability encountered in previous reports. Chemical characterization of the ink reveals 3-mercaptopriopionic acid (MPA) capped QDs stable in benzylamine solvent over a period of weeks or longer. The film resistivity, 1.45 kΩ cm, is an order magnitude lower and surface roughness, ∼ 0.5 nm, is superior vs. PbS films reported so far, and proof of concept photovoltaic devices showed efficiency > 5.5%.