Published January 1, 2015
| Version v1
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Stable Dispersion of Iodide-Capped PbSe Quantum Dots for High-Performance Low-Temperature Processed Electronics and Optoelectronics
Creators
- 1. Inst Semicond & Microsyst, Elect & Comp Engn, D-01187 Dresden, Germany
- 2. IFW Dresden, Inst Complex Mat, D-01069 Dresden, Germany
- 3. Tech Univ Chemnitz, Semicond Phys, D-09107 Chemnitz, Germany
- 4. Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, Dept Phys, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey
Description
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(2)/(V center dot s) and (2.9 +/- 0.4) cm(2)/(V center dot 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.
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