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  4. Solution Processing and Self-Organization of PbS Quantum Dots Passivated with Formamidinium Lead Iodide (FAPbI(3))
 
research article

Solution Processing and Self-Organization of PbS Quantum Dots Passivated with Formamidinium Lead Iodide (FAPbI(3))

Aynehband, Samaneh
•
Mohammadi, Maryam
•
Thorwarth, Kerstin
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June 30, 2020
Acs Omega

Solution-processed lead sulfide quantum dots (PbS QDs) are very attractive as NIR-active semiconductors for the fabrication of cost-efficient optoelectronic devices. To control the thin film carrier transport, as well as stability, surface passivation is of crucial importance. Here, we present the successful surface passivation of PbS QDs by the formamidinium lead iodide (FAPbI(3)) ligand. An effective procedure for the fabrication of FAPbI(3)-passivated PbS QDs through a binary-phase ligand exchange protocol in hexane and n-methylformamide is demonstrated. It is shown that this solution-processed ligand exchange drastically changes the photoluminescence intensity, exciton recombination dynamics, and carrier lifetime of the nanocrystals. The solution casting of the ligand-exchanged nanocrystals into thin films results in the periodic ordering of QDs in a square superlattice with close contacts. Planar graphene/QD photodetectors fabricated with PbS QDs passivated with FAPbI(3) show substantially increased thermal stability as compared to similar devices using PbS QDs passivated with commonly used methylammonium lead iodide.

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Type
research article
DOI
10.1021/acsomega.0c02319
Web of Science ID

WOS:000546100300093

Author(s)
Aynehband, Samaneh
•
Mohammadi, Maryam
•
Thorwarth, Kerstin
•
Hany, Roland
•
Nueesch, Frank Alain  
•
Rossell, Marta D.
•
Pauer, Robin
•
Nunzi, Jean-Michel
•
Simchi, Abdolreza
Date Issued

2020-06-30

Published in
Acs Omega
Volume

5

Issue

25

Start page

15746

End page

15754

Subjects

Chemistry, Multidisciplinary

•

Chemistry

•

solar-cells

•

infrared photodetectors

•

halide perovskites

•

thin-films

•

nanocrystals

•

surface

•

adsorption

•

composite

•

graphene

•

ligands

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
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Available on Infoscience
July 23, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/170310
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