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Tuning the photoinduced charge transfer from CdTe quantum dots to ZnO nanofilms through Ga doping
- Source :
- Optical Materials. 96:109311
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Tuning the charge transfer rate between quantum dots (QDs) and metal oxide (MO) is important for improving the performances of QDs-MO devices. And tailoring the energy band of MO is one way to tune the charge transfer rate. In this work, we enhance the charge transfer rate between CdTe QDs and ZnO through tailoring the optical band gap of ZnO nanofilms by Ga-doping. The Ga doping influenced the photo luminescence (PL) performance of CdTe QDs/ZnO hybrid structures. The results of time-resolved fluorescence spectra revealed that the charge transfer rate from CdTe QDs to ZnO nanofilms could be tuned by varying the Ga doping concentrations in ZnO. And, transfer rate were increased by up to ~4.1 times through Ga doping. In addition, the structure showed electron transfer efficiency improvements to the tune of ~25.3%. We attribute the improvement to efficient electron transfer via band-band transfer and the defects pathways induced by Ga-doping. The experimental results will be useful for improving the efficiency of optical devices using QDs/ZnO hybrid structure.
- Subjects :
- Materials science
business.industry
Band gap
Organic Chemistry
Doping
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
Cadmium telluride photovoltaics
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Inorganic Chemistry
Electron transfer
Semiconductor
Quantum dot
Optoelectronics
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
0210 nano-technology
business
Electronic band structure
Luminescence
Spectroscopy
Subjects
Details
- ISSN :
- 09253467
- Volume :
- 96
- Database :
- OpenAIRE
- Journal :
- Optical Materials
- Accession number :
- edsair.doi...........b22568644b10994de23c68ae059e0e28