7 research outputs found
Stable Dispersion of Iodide-Capped PbSe Quantum Dots for High-Performance Low-Temperature Processed Electronics and Optoelectronics
Here, we present
a ligand exchange of long insulating molecules
with short, robust, and environmentally friendly iodide ions via a
mild flocculation of PbSe nanocrystals (NCs). This ligand exchange
leads to the formation of stable colloidal solutions in various polar
solvents and in a broad concentration range via electrostatic repulsion.
The iodide capping ligands preserve the electronic structure and maintain
the optical properties of the PbSe NCs, both in solution and in the
form of solid films. The spin-coated PbSe NC solids exhibit good transport
characteristics with electron mobilities in the linear and saturation
regimes reaching (2.1 ± 0.3) cm<sup>2</sup>/(V·s) and (2.9
± 0.4) cm<sup>2</sup>/(V·s), respectively. This opens up opportunities for the low-cost and low-temperature
fabrication of NC thin films being attractive for applications in
the fields of electronics and optoelectronics