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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Comparing Halide Ligands in PbS Colloidal Quantum Dots for Field-Effect Transistors and Solar Cells
Dmytro Bederak1, Daniel M Balazs1, Nataliia V Sukharevska1
1Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.
ACS Applied Nano Materials
|January 8, 2019
Summary
Fluoride ligands effectively passivate colloidal quantum dots (CQDs), enhancing their p-type conductivity for optoelectronic applications. This study compares fluoride passivation to other halides, revealing its potential in solar cells.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Physics
Background:
- Colloidal quantum dots (CQDs) require surface passivation with atomic ligands to tune properties and improve charge transport.
- Halide ligands are effective for CQD surface passivation, crucial for optoelectronic devices.
- While heavier halides (I-, Br-) are well-studied, fluoride (F-) passivation remains underexplored.
Purpose of the Study:
- To demonstrate effective fluoride ligand coating on lead sulfide (PbS) CQDs.
- To compare the performance of fluoride-capped PbS CQDs with those treated with other halide ligands.
- To investigate the impact of fluoride passivation on charge carrier mobility and p-type behavior in CQD solids.
Main Methods:
- Coating PbS CQDs with fluoride ligands and other halides.
- Fabricating field-effect transistors (FETs) using treated PbS CQD solids.
- Measuring electron and hole mobility in the FETs.
- Implementing Cl- and F-capped PbS CQD solids as p-type layers in solar cells.
Main Results:
- Electron mobility in PbS CQD FETs increased with ligand size, from 3.9 × 10^-4 cm^2/(V s) for fluoride to 2.1 × 10^-2 cm^2/(V s) for iodide.
- Hole mobility remained relatively unchanged across different halide treatments (1 × 10^-5 to 10^-4 cm^2/(V s)).
- Fluoride- and chloride-treated films exhibited more pronounced p-type behavior compared to iodide-treated films.
- Solar cells using F- and Cl-capped PbS CQDs as p-type layers showed performance comparable to devices using 1,2-ethanedithiol.
Conclusions:
- Fluoride passivation is an effective method for PbS CQDs, enhancing their p-type characteristics.
- The size-dependent electron mobility suggests ligand engineering can tune charge transport.
- Fluoride- and chloride-capped PbS CQDs are viable for optoelectronic devices, particularly as p-type layers in solar cells, broadening material utility.
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