Densification of Doped Zinc Oxide Nanocrystal Films via Chemical Bath Infiltration

Wainer, Pierce; Embden, Joel van; Gaspera, Enrico Della

doi:10.1002/admi.202201503

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…Another major difference between these two classes of optoelectronic devices is the use of ZnO NCs as the transparent electrodes themselves. Despite excellent recent progress, due to nonideal charge transport across grain boundaries, solution-processed electrodes, especially if fabricated from NCs, fail to achieve the performances of their sputtered counterparts, even if excellent progress in this area has been achieved recently. − However, while resistive losses are detrimental for solar cells, they are not that critical for LEDs, where electrode conductivities an order of magnitude lower than those required in solar cells are still considered acceptable. , As such, there are some examples of ZnO NC assemblies achieving conductivities amenable for their direct implementation as transparent electrodes. However, most applications involving ZnO NC within LEDs are still as electron transport layers.…”

Section: Applications Of Zinc Oxide Colloidal Nanocrystalsmentioning

confidence: 99%

Colloidal Approaches to Zinc Oxide Nanocrystals

et al. 2022

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Zinc oxide is an extensively studied semiconductor with a wide band gap in the near-UV. Its many interesting properties have found use in optics, electronics, catalysis, sensing, as well as biomedicine and microbiology. In the nanoscale regime the functional properties of ZnO can be precisely tuned by manipulating its size, shape, chemical composition (doping), and surface states. In this review, we focus on the colloidal synthesis of ZnO nanocrystals (NCs) and provide a critical analysis of the synthetic methods currently available for preparing ZnO colloids. First, we outline key thermodynamic considerations for the nucleation and growth of colloidal nanoparticles, including an analysis of different reaction methodologies and of the role of dopant ions on nanoparticle formation. We then comprehensively review and discuss the literature on ZnO NC systems, including reactions in polar solvents that traditionally occur at low temperatures upon addition of a base, and high temperature reactions in organic, nonpolar solvents. A specific section is dedicated to doped NCs, highlighting both synthetic aspects and structure−property relationships. The versatility of these methods to achieve morphological and compositional control in ZnO is explicated. We then showcase some of the key applications of ZnO NCs, both as suspended colloids and as deposited coatings on supporting substrates. Finally, a critical analysis of the current state of the art for ZnO colloidal NCs is presented along with existing challenges and future directions for the field.

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Section: Applications Of Zinc Oxide Colloidal Nanocrystalsmentioning

confidence: 99%

Colloidal Approaches to Zinc Oxide Nanocrystals

et al. 2022

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PbSe Quantum Dot Superlattice Thin Films for Thermoelectric Applications

Sousa,

Goto,

Claro

et al. 2024

Adv Funct Materials

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An unusual self‐assembly pattern is observed for highly ordered 1500‐nm‐thick films of monodisperse 13‐nm‐sized colloidal PbSe quantum dots, originating from their faceted truncated cube‐like shape. Specifically, self‐assembled PbSe dots exhibited attachment to the substrate by <001> planes followed by an interconnection through the {001} facets in plan‐view and {110}/{111} facets in cross‐sectional‐view, thus forming a cubic superlattice. The thermoelectric properties of the PbSe superlattice thin films are investigated by means of frequency domain thermoreflectance, scanning thermal probe microscopy, and four‐probe measurements, and augmented by computational efforts. Thermal conductivity of the superlattice films is measured as low as 0.7 W m−1 K−1 at room temperature due to the developed nanostructure. The low values of electrical conductivity are attributed to the presence of insulating oleate capping ligands at the dots’ surface and the small contact area between the PbSe dots within the superlattice. Experimental efforts aiming at the removal of the oleate ligands are conducted by annealing or molten‐salt treatment, and in the latter case, yielded a promising improvement by two orders of magnitude in thermoelectric performance. The result indicates that the straightforward molten‐salt treatment is an interesting approach to derive thermoelectric dot superlattice thin films over a centimeter‐sized area.

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