Oxygen-Controlled Photoconductivity in ZnO Nanowires Functionalized with Colloidal CdSe Quantum Dots

被引：29
|
作者：
Hou, Dongchao [1 ]
Dev, Apurba [1 ,2 ]
Frank, Kristian [1 ]
Rosenauer, Andreas [1 ]
Voss, Tobias [1 ,3 ]
机构：
[1] Univ Bremen, Inst Solid State Phys, D-28359 Bremen, Germany
[2] Royal Inst Technol, KTH, Sch Informat & Commun Technol, S-16440 Stockholm, Sweden
[3] Univ Freiburg, Inst Microsyst Engn, D-79106 Freiburg, Germany
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 36期
关键词：
ZINC-OXIDE; SEMICONDUCTOR NANOCRYSTALS; SURFACE; CELLS; GAN; PHOTOPHYSICS; CHEMISTRY; CRYSTALS; CLUSTERS; DEVICES;
D O I：
10.1021/jp307235u
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：
ZnO nanowire arrays were functionalized with colloidal CdSe quantum dots stabilized by 3-mercaptopropionic acid to form hybrid devices. The photoconductivity of the nanowire/quantum-dot devices was studied under selective photoexcitation of the quantum dots, and it was found that the dynamics strongly depend on the gas environment. Desorption of surface oxygen from both the ZnO nanowires and the CdSe quantum dots, activated by electron tunnelling between the nanowires and the quantum dots, is found to be the dominating process that determines the dynamic of the photoconductivity in the hybrid nanowire/quantum-dot devices.
引用
收藏
页码：19604 / 19610
页数：7
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