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Facet-Oriented Coupling Enables Fast and Sensitive Colloidal Quantum Dot Photodetectors
Margherita Biondi1, Min-Jae Choi1, Zhibo Wang2
1Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
Advanced Materials (Deerfield Beach, Fla.)
|July 10, 2021
Summary
Researchers improved colloidal quantum dot (CQD) solids by reconstructing their surfaces. This enhanced facet alignment boosts charge carrier mobility and optoelectronic device performance, achieving faster infrared photodetectors.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Charge carrier transport in colloidal quantum dot (CQD) solids is limited by random CQD facet orientation.
- This random orientation hinders CQD coupling strength and degrades optoelectronic device performance.
Purpose of the Study:
- To report a colloidal-phase reconstruction strategy for CQD surfaces.
- To improve facet alignment in CQD solids for enhanced coupling and device performance.
Main Methods:
- Utilized post-synthetic resurfacing of CQDs to control faceting.
- Achieved specific (100):(100) facet coupling through surface passivation and colloidal stabilization.
Main Results:
- Demonstrated a 10x increase in hole mobility in the modified CQD solids.
- Developed photodiodes with 70% external quantum efficiency at 1550 nm.
- Achieved specific detectivity (D*) > 10^12 Jones and a 7 ns response time for solution-processed short-wavelength infrared photodetectors.
Conclusions:
- Colloidal-phase reconstruction effectively enhances CQD facet alignment and coupling.
- The improved CQD solids enable high-performance, fast, and solution-processed infrared photodetectors.
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