1 research outputs found
One-Step Deposition of Photovoltaic Layers Using Iodide Terminated PbS Quantum Dots
We present a one-step layer deposition
procedure employing ammonium
iodide (NH<sub>4</sub>I) to achieve photovoltaic quality PbS quantum
dot (QD) layers. Ammonium iodide is used to replace the long alkyl
organic native ligands binding to the QD surface resulting in iodide
terminated QDs that are stabilized in polar solvents such as <i>N</i>,<i>N</i>-dimethylformamide without particle
aggregation. We extensively characterized the iodide terminated PbS
QD via UV–vis absorption, transmission electron microscopy
(TEM), thermogravimetric analysis (TGA), FT-IR transmission spectroscopy,
and X-ray photoelectron spectroscopy (XPS). Finally, we fabricated
PbS QD photovoltaic cells that employ the iodide terminated PbS QDs.
The resulting QD-PV devices achieved a best power conversion efficiency
of 2.36% under ambient conditions that is limited by the layer thickness.
The PV characteristics compare favorably to similar devices that were
prepared using the standard layer-by-layer ethandithiol (EDT) treatment
that had a similar layer thickness