Semiconductor nanowires self-assembled from colloidal CdTe nanocrystal building blocks: optical properties and application perspectives

Abstract

Solution based self assembly of quasi one dimensional semiconductor nanostructures (nanowires) from quasi zero dimensional (quantum dots) colloidal nanocrystal building blocks has proven itself as a powerful and flexible preparation technique. Polycrystalline CdTe nanowires self assembled from light emitting thiol capped CdTe nanocrystals are the focus of this Feature Article. These nanowires represent an interesting model system for quantum dot solids, where electronic coupling between the individual nanocrystals can be optically accessed and controlled. We provide a literature based summary of the formation mechanism and the morphology related aspects of self assembled CdTe nanowires, and highlight several fundamental and application related optical properties of these nanostructures. These include fundamental aspects of polarization anisotropies in photoluminescence excitation and emission, the electronic coupling between individual semiconductor nanocrystals constituting the nanowires, and more applied, waveguiding properties of CdTe nanowire bundles and anti Stokes photoluminescence in a prototypical structure of co axial nanowires. The optical properties of self assembled CdTe nanowires considered here render them potential candidates for photonic nano scale devices.

Vapour–liquid–solid‐assisted growth of cadmium telluride nanowires and their field emission properties

“…6 gives the PL spectrum of as‐synthesised CdTe nanowires at room temperature. It shows strong emission peak at 630 nm which is consistent with previous literatures [13–15].…”

Progress in laser cooling semiconductor nanocrystals and nanostructures

“…This entails observations of redshifted ASPL spectra relative to the normal NC/nanostructure band edge emission. These redshifts have been observed in CdS 1 − x Se x 110 , CdSe 59,62,109 , CdTe 59,63,65,66,71,105,112,113 , PbS NC-doped glasses 67,115 , CsPbBr 3 73,103 , and CsPbBrI 2 NCs 69 . Figure 9a provides an example, showing the apparent~8 meV redshift between the emission and ASPL spectra of a CsPbBr 3 NC ensemble.…”

“…, CdS 56 , CdSe [58][59][60][61][62]104 , CdTe 59,[63][64][65]105 , PbS 67 , CsPbBr 3 73,103 , and CsPbBrI 2 69,106 . Other nanostructures exhibiting linear I ASPL versus I exc behavior include CdS NBs 47,57,107 , ZnTe nanoribbons 108 , bulk MAPbI 3…”

Resonance energy transfer in self-organized organic/inorganic dendrite structures

“…Self-assembly processes offer a route for assembling these hybrid nanomaterials into larger functional systems, providing a platform for future applications in nano-and optoelectronic devices, nanomanufacturing, renewable energy harvest and storage, biomedical sensing, etc. [1][2][3][4] Recent reports on hybrid nanostructures based on semiconductor quantum dots (QDs) and organic cyanine dyes (Jaggregates) demonstrate that they are very promising for photovoltaic applications where QD/J-aggregate complexes could work as extremely efficient light-harvesting antennas with a strongly extended spectral absorption range. [5][6][7] Therefore, the development of a novel organic/inorganic hybrid material by combining QDs and J-aggregates and exploring the effect of excitonic energy transfer between conned Wannier-Mott excitons of inorganic semiconductor structures and Frenkel excitons of organic dyes (or their aggregates) are of considerable interest for fundamental studies of interaction between light and matter.…”