Wafer-Scale Thermophoretic Dry Deposition of Single-Walled Carbon Nanotube Thin Films

“…Second, ∇T can also induce a thermophoretic force (F th ) in the −∇T direction. [32,33] According to the theory of thermophoresis, gas molecules at the hot side carry more kinetic energy than those at the cold side. [34,35] A resultant net force, i.e., the thermophoretic force, is applied on the particle (ultralong CNT in this case) and drive it to move from the hot side to the cold side.…”

Section: Temperature Gradient-induced Forcesmentioning

confidence: 99%

The Inherent Thermal Effect of Substrates on the Growth of Ultralong Carbon Nanotubes

Jiang

Wang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Ultralong carbon nanotubes (CNTs) are believed to be ideal candidates for various high-end applications because of their macroscale lengths, perfect structures, and excellent mechanical and electrical properties. The key to the wide application of ultralong CNTs is their controlled synthesis and mass production. Ultralong CNTs usually follow a flying kite-like growth mechanism, during which process there exists a thermal buoyancy that keeps ultralong CNTs floating in the gas flow. However, it remains vague for a long time about the origin of this thermal buoyancy. Herein, a simple and quantitative heat balance model is proposed to describe the inherent thermal effect of substrates, which explains the origin of the temperature difference between the substrate and the gas flow. The inherent thermal effect is found to be positively correlated with the emissivity of the substrates. Then, the local temperature gradient induced by the inherent thermal effect is found to result in both natural convection and thermophoresis. Thermophoretic force is proven to be the dominant driving force for lifting the ultralong CNTs up from the substrates. By utilizing the inherent thermal effect and designing the local temperature distribution, the areal density and orientation of ultralong CNT arrays are modulated.

show abstract

“…Interestingly, merging dry-printed single-walled carbon nanotubes (SWCNT) [84] with transparent alternative redox couples, such as cobalt shuttles, appears to be a promising new approach to producing bifacial polymer DSSCs. These SWCNTs have already been tested as metal-free CEs on polymer substrates with a mechanical transfer process and they have been assembled in a lab-sized DSSC configuration with glass PEs [85].…”

Section: Configurations Of Dsscs and The Role Of Electrolytesmentioning

confidence: 99%

Progress on Electrolytes Development in Dye-Sensitized Solar Cells

et al. 2019

View full text Add to dashboard Cite

Dye-sensitized solar cells (DSSCs) have been intensely researched for more than two decades. Electrolyte formulations are one of the bottlenecks to their successful commercialization, since these result in trade-offs between the photovoltaic performance and long-term performance stability. The corrosive nature of the redox shuttles in the electrolytes is an additional limitation for industrial-scale production of DSSCs, especially with low cost metallic electrodes. Numerous electrolyte formulations have been developed and tested in various DSSC configurations to address the aforementioned challenges. Here, we comprehensively review the progress on the development and application of electrolytes for DSSCs. We particularly focus on the improvements that have been made in different types of electrolytes, which result in enhanced photovoltaic performance and long-term device stability of DSSCs. Several recently introduced electrolyte materials are reviewed, and the role of electrolytes in different DSSC device designs is critically assessed. To sum up, we provide an overview of recent trends in research on electrolytes for DSSCs and highlight the advantages and limitations of recently reported novel electrolyte compositions for producing low-cost and industrially scalable solar cell technology.

show abstract

Wafer-Scale Thermophoretic Dry Deposition of Single-Walled Carbon Nanotube Thin Films

Cited by 9 publications

References 29 publications

Advanced research trends in dye-sensitized solar cells

Advanced research trends in dye-sensitized solar cells

The Inherent Thermal Effect of Substrates on the Growth of Ultralong Carbon Nanotubes

Progress on Electrolytes Development in Dye-Sensitized Solar Cells

Contact Info

Product

Resources

About