Enhanced photoresponse in ZnO nanowires decorated with CdTe quantum dot

被引：91

作者：

Aga, R. S., Jr. ^{[1
]}

Jowhar, D.

Ueda, A.

Pan, Z.

Collins, W. E.

Mu, R.

Singer, K. D.

Shen, J.

机构：

[1] Fisk Univ, Dept Phys, Nashville, TN 37208 USA

[2] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA

[3] Ctr Nanophase Mat Sci Div, Div Mat Sci & Technol, Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 23期

关键词：

D O I：

10.1063/1.2822896

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The photoresponse of ZnO nanowires irradiated with photons having energies below the band gap of ZnO (3.4 eV) was studied before and after deposition of CdTe quantum dots via a pulsed electron-beam technique. The small amount of deposited CdTe did not increase the dark current of the samples. However, a substantial increase in the steady state photocurrent was observed after CdTe deposition suggesting a clear photosensitization effect. Results revealed that CdTe influences the photoconductivity transients of ZnO by minimizing its interaction with oxygen in air as well as providing additional traps that serve to increase the photocurrent time constant. (c) 2007 American Institute of Physics.

引用

收藏

页数：3

相关论文

共 13 条

[1] Origin of the slow photoresponse in an individual sol-gel synthesized ZnO nanowire [J].

Ahn, Seung-Eon ;

Ji, Hyun Jin ;

Kim, Kanghyun ;

Kim, Gyu Tae ;

Bae, Chang Hyun ;

Park, Seung Min ;

Kim, Yong-Kwan ;

Ha, Jeong Sook .

APPLIED PHYSICS LETTERS, 2007, 90 (15)

[2] Nanowire-based dye-sensitized solar cells [J].

Baxter, JB ;

Aydil, ES .

APPLIED PHYSICS LETTERS, 2005, 86 (05) :1-3

[3] Sensitization of nanocrystalline TiO2 electrode with quantum sized CdSe and ZnTCPc molecules [J].

Fang, JH ;

Wu, JW ;

Lu, XM ;

Shen, YC ;

Lu, ZH .

CHEMICAL PHYSICS LETTERS, 1997, 270 (1-2) :145-151

[4] LIGHT-INDUCED REDOX REACTIONS IN NANOCRYSTALLINE SYSTEMS [J].

HAGFELDT, A ;

GRATZEL, M .

CHEMICAL REVIEWS, 1995, 95 (01) :49-68

[5] CHARACTERISTICS OF DEEP LEVELS IN N-TYPE CDTE [J].

KHATTAK, GM ;

SCOTT, CG .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1991, 3 (44) :8619-8634

[6] Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices [J].

Leschkies, Kurtis S. ;

Divakar, Ramachandran ;

Basu, Joysurya ;

Enache-Pommer, Emil ;

Boercker, Janice E. ;

Carter, C. Barry ;

Kortshagen, Uwe R. ;

Norris, David J. ;

Aydil, Eray S. .

NANO LETTERS, 2007, 7 (06) :1793-1798

[7] Sub-bandgap photoconductivity in ZnO epilayers and extraction of trap density spectra [J].

Moazzami, K ;

Murphy, TE ;

Phillips, JD ;

Cheung, MCK ;

Cartwright, AN .

SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 2006, 21 (06) :717-723

[8] SYNTHESIS AND CHARACTERIZATION OF SURFACE-MODIFIED COLLOIDAL CDTE QUANTUM DOTS [J].

RAJH, T ;

MICIC, OI ;

NOZIK, AJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (46) :11999-12003

[9] Hybrid polymer/zinc oxide photovoltaic devices with vertically oriented ZnO nanorods and an amphiphilic molecular interface layer [J].

Ravirajan, P ;

Peiró, AM ;

Nazeeruddin, MK ;

Graetzel, M ;

Bradley, DDC ;

Durrant, JR ;

Nelson, J .

JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (15) :7635-7639

[10] Persistent photoconductivity in highly porous ZnO films [J].

Reemts, Jens ;

Kittel, Achim .

JOURNAL OF APPLIED PHYSICS, 2007, 101 (01)