Unveiling the Electronic Structure of ZnO-C-60 Core-Shell Quantum Dots: The Origin of Efficient Electron Transport

Authors
Hyun, GyeonghoPark, SoohyungJeong, JunkyeongLee, Kyu SeungSon, Dong IckLee, HyunbokYi, 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
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE