Unveiling the Electronic Structure of ZnO-C60 Core-Shell Quantum Dots: The Origin of Efficient Electron Transport

被引：7

作者：

Hyun, Gyeongho ^{[1
]}

Park, Soohyung ^{[1
]}

Jeong, Junkyeong ^{[1
]}

Lee, Kyu Seung ^{[2
]}

Son, Dong Ick ^{[2
]}

Lee, Hyunbok ^{[3
]}

Yi, Yeonjin ^{[1
]}

机构：

[1] Yonsei Univ, Inst Phys & Appl Phys, 50 Yonsei Ro, Seoul 03722, South Korea

[2] Korea Inst Sci & Technol, Inst Adv Composite Mat, Eunhari San 101, Wanju Gun 565905, Jeonbuk, South Korea

[3] Kangwon Natl Univ, Dept Phys, 1 Gangwondaehak Gil, Chuncheon Si 24341, Gangwon Do, South Korea

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 22期

基金：

新加坡国家研究基金会;

关键词：

ENERGY-LEVEL ALIGNMENT; ORGANIC SOLAR-CELLS; ZINC-OXIDE; SEMICONDUCTOR NANOCRYSTALS; PHOTOEMISSION-SPECTROSCOPY; OPTICAL-PROPERTIES; CDSE NANOCRYSTALS; COLLECTION LAYER; LIGAND; ZNO;

D O I：

10.1021/acs.jpcc.7b02725

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：12230 / 12235

页数：6

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