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Large-area semi-transparent light-sensitive nanocrystal skins.
Shahab Akhavan1, Burak Guzelturk, Vijay Kumar Sharma
1UNAM–Institute of Materials Science and Nanotechnology, Department of Electrical and Electronics Engineering, Department of Physics, Bilkent University, Ankara, 06800, Turkey.
Optics Express
|November 29, 2012
Summary
We developed a large-area, light-sensitive nanocrystal skin (LS-NS) for enhanced UV/visible sensing. This stable, semi-transparent platform offers faster response times and improved sensitivity for smart building applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Conventional photodetectors often face limitations in large-area fabrication, response speed, and sensitivity.
- Nanocrystal-based devices offer potential for novel sensing applications due to their tunable optoelectronic properties.
Purpose of the Study:
- To develop a large-area, semi-transparent, light-sensitive nanocrystal skin (LS-NS) platform.
- To investigate the performance enhancement of LS-NS devices through ligand removal and explore their potential for UV/visible sensing.
Main Methods:
- Fabrication of LS-NS devices using spray-coating and dip-coating techniques over large areas (up to 48 cm²).
- Operation based on photogenerated potential buildup principle.
- Implementation of proof-of-concept devices using Cadmium Telluride (CdTe) nanocrystals with ligand removal.
Main Results:
- Achieved substantial sensitivity enhancement of approximately 73%.
- Demonstrated a 3-fold faster response time, below 100 ms.
- Observed high stability of fully sealed nanocrystal monolayers under ambient conditions.
Conclusions:
- The developed LS-NS platform shows significant promise for low-cost, large-area UV/visible sensing.
- Potential applications include integration into windows and facades of smart buildings.
- The photogenerated potential buildup mechanism offers an alternative to conventional charge collection for enhanced sensing.
