ZnO/anthracene based inorganic/organic nanowire heterostructure: Photoresponse and photoluminescence studies

被引：24

作者：

Dhara, Soumen ^{[1
]}

Giri, P. K. ^{[1
,2
]}

机构：

[1] Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, India

[2] Indian Inst Technol Guwahati, Ctr Nanotechnol, Gauhati 781039, India

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 04期

关键词：

LIGHT-EMITTING-DIODES; ZNO NANOWIRES; PHOTODETECTORS; ANTHRACENE; NANORODS; FILMS; LASER;

D O I：

10.1063/1.3687936

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of surface modification of vertically aligned ZnO nanowires (NWs) with anthracene for the improved photocurrent, photoresponse, and UV photoluminescence have been investigated in this work. The formation of ZnO/anthracene based inorganic/organic NWs heterostructure by surface capping with anthracene solution was confirmed from the high resolution transmission electron microscopy and Fourier transport infrared spectroscopy analyses. After the anthracene capping of ZnO NWs, despite an increase in dark current, we obtained a significant improvement in the photocurrent and photoresponsivity. A sixfold improvement in the UV photocurrent-to-dark current ratio is obtained with capping. Compared to the uncapped NWs, the photoresponse is significantly faster for the ZnO/anthracene system with response and reset times of 1.5 and 1.6 s, respectively. The room temperature photoluminescence spectra show threefold enhanced UV emission with large enhancement in the ratio of UV to green emission intensities. The faster photoresponse and enhanced photocurrent from the ZnO/anthracene heterostructure are explained on the basis of modification of surface defects and interfacial charge transfer process. VC 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3687936]

引用

页数：7

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