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Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices
Published on: July 8, 2016
All-inorganic colloidal quantum dot photovoltaics employing solution-phase halide passivation
Zhijun Ning1, Yuan Ren, Sjoerd Hoogland
1Department of Electrical and Computer Engineering, University of Toronto, Ontario, Canada.
Advanced Materials (Deerfield Beach, Fla.)
|September 13, 2012
Summary
Researchers developed a new passivation strategy for colloidal quantum dots, significantly boosting their electronic properties. This breakthrough enables the creation of highly efficient solar cells with record-breaking performance using all-inorganic quantum dots.
Area of Science:
- Materials Science
- Nanotechnology
- Photovoltaics
Background:
- Colloidal quantum dots (CQDs) offer tunable optoelectronic properties.
- Improving charge carrier mobility and reducing trap states are crucial for efficient CQD devices.
- Existing passivation strategies have limitations in enhancing electronic performance.
Purpose of the Study:
- To introduce a novel solution-phase halide passivation technique for CQD films.
- To enhance the electronic properties of CQD films, specifically charge carrier mobility and trap state density.
- To develop high-efficiency solar cells based on all-inorganic CQDs.
Main Methods:
- Application of a solution-phase halide passivation strategy to CQD films.
- Experimental characterization of electronic properties, including mobility and trap state density.
- Fabrication and testing of solar cell devices utilizing passivated CQDs.
Main Results:
- Achieved an order-of-magnitude increase in charge carrier mobility.
- Demonstrated a significant reduction in trap state density within CQD films.
- Developed all-inorganic CQD solar cells with a record power conversion efficiency of 6.6%.
Conclusions:
- The halide passivation strategy effectively improves CQD film electronic properties.
- Enhanced photocarrier collection efficiency, particularly for infrared light, boosts photocurrent.
- This work paves the way for advanced CQD-based photovoltaic applications.
