Unveiling the Electronic Structure of ZnO-C-60 Core-Shell Quantum Dots: The Origin of Efficient Electron Transport
- Authors
- Hyun, Gyeongho; Park, Soohyung; Jeong, Junkyeong; Lee, Kyu Seung; Son, Dong Ick; Lee, Hyunbok; Yi, Yeonjin
- Issue Date
- 2017-06-08
- Publisher
- American Chemical Society
- Citation
- The Journal of Physical Chemistry C, v.121, no.22, pp.12230 - 12235
- Abstract
- The electronic structure of ZnO core-C-60 shell (ZnO@C-60) quantum dots (QDs) was investigated with the help of model interface analysis between ZnO QDs and C-60 using in situ ultraviolet and X-ray photoelectron spectroscopy measurements. To form the ZnO QDs/C-60 interface in situ, a vacuum-integrated electrospray deposition technique was employed to simulate the electronic interactions between ZnO QDs and C-60 upon the formation of a ZnO@C-60 core-shell structure. Photoelectron spectra of ZnO QDs/C-60 interface formation were compared with those of ZnO@C-60 QD and pristine ZnO QD films. The results revealed that ZnO QDs and C-60 interacted via electron transfer leading to the change in ionization energy.of the surface C-60. This induced a negligible energy barrier between the lowest unoccupied molecular orbital level of C-60 and the conduction band minimum of ZnO, which led to efficient electron transport through the ZnO@C-60 QDs.
- Keywords
- ENERGY-LEVEL ALIGNMENT; ORGANIC SOLAR-CELLS; ZINC-OXIDE; SEMICONDUCTOR NANOCRYSTALS; PHOTOEMISSION-SPECTROSCOPY; OPTICAL-PROPERTIES; CDSE NANOCRYSTALS; COLLECTION LAYER; LIGAND; ZNO; ENERGY-LEVEL ALIGNMENT; ORGANIC SOLAR-CELLS; ZINC-OXIDE; SEMICONDUCTOR NANOCRYSTALS; PHOTOEMISSION-SPECTROSCOPY; OPTICAL-PROPERTIES; CDSE NANOCRYSTALS; COLLECTION LAYER; LIGAND; ZNO; ZnO-C60; Core-Shell Quantum
Dots; Efficient Electron Transport; Electronic Structure
- ISSN
- 1932-7447
- URI
- https://pubs.kist.re.kr/handle/201004/122636
- DOI
- 10.1021/acs.jpcc.7b02725
- Appears in Collections:
- KIST Article > 2017
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