Modelling-assisted geometrical optimization of colloidal quantum color convertor based pixels fabricated by
Priyanka Tyagi1, Etienne Palleau2, Laurence Ressier2
1LPCNO, Université de Toulouse, CNRS, INSA, UPS, 135 avenue de Rangueil, Toulouse, 31077, France; NEXDOT, 102 Av. Gaston Roussel, Romainville, 93230, France.
Journal of Colloid and Interface Science
|October 5, 2024
Summary
Using larger semiconductor nanocrystal objects can increase deposition thickness for microdisplays, but may cause lateral assembly extension. This trade-off was modeled and confirmed experimentally for improved color conversion pixels.
Area of Science:
- Materials Science
- Nanotechnology
- Physics
Background:
- Achieving sufficient deposition thickness of semiconductor nanocrystals is crucial for efficient color conversion pixels in microdisplays.
- Dielectrophoretic directed assembly is a key technique for arranging these nanocrystals.
Purpose of the Study:
- To model and simulate the dielectrophoretic directed assembly of semiconductor nanocrystals.
- To identify intrinsic limitations of the assembly process and explore new assembly routes.
- To optimize deposition conditions for maximal nanocrystal pixel thickness.
Main Methods:
- Developed a theoretical model for dielectrophoretic interactions between polarizable nano-spheres and patterned substrates.
- Employed Monte Carlo simulations to analyze assembly parameters and identify optimal conditions.
- Conducted experiments using Cadmium Selenide (CdSe) quantum plates and alumina micro-pearls embedding quantum plates.
Main Results:
- Modeling revealed that small nanocrystal size limits the dielectrophoretic force, capping assembly thickness.
- Simulations suggest larger objects can achieve greater heights but lead to lateral extension.
- This size-dependent trade-off was visualized and experimentally validated using micro-pearls.
Conclusions:
- The intrinsic limitation for nanocrystal pixel thickness in dielectrophoretic assembly is object size.
- Utilizing larger assembly units offers a route to increased height, albeit with a trade-off in lateral spread.
- This research provides insights for designing improved semiconductor nanocrystal-based microdisplays.
